The Golden Gate Bridge at dusk with city lights in the background.

Find hotels in Mill Valley, CA from AED 290

  • Change your mind

    Book hotels with free cancellation
  • Treat yourself

    Sign in to save 10% or more on thousands of hotels
  • Be picky

    Search almost a million properties worldwide

Check prices for these dates

Next weekend
In two weeks

Filter by

Property class

Guest rating

Selecting then applying a filter from this group will update the results on a new page

Our top choices for Mill Valley hotels

1. Holiday Inn Express Mill Valley San Francisco Area by IHG

Holiday Inn Express Mill Valley San Francisco Area by IHG
2.5 star property
Almonte
8.8 out of 10, Excellent, (1,003 reviews)
"Dated, clean room, GREAT breakfast"
United States
John
The price is AED 559
AED 653 total
includes taxes & fees
8 Nov - 9 Nov
Holiday Inn Express Mill Valley San Francisco Area by IHG

2. Mill Valley Inn

Mill Valley Inn
3.0 star property
Downtown Mill Valley
9.8 out of 10, Exceptional, (333 reviews)
"Great local place excellent location"
United States
Justin
The price is AED 1,090
AED 1,222 total
includes taxes & fees
1 Dec - 2 Dec
Mill Valley Inn

3. Acqua Hotel

Acqua Hotel
2.5 star property
Mill Valley
9.4 out of 10, Exceptional, (845 reviews)
"Great spacious and really well designed interior"
United States
Sam
The price is AED 1,027
AED 1,152 total
includes taxes & fees
22 Nov - 23 Nov
Acqua Hotel

4. The Evergreen

The Evergreen
2.0 star property
Corte Madera
9.2 out of 10, Wonderful, (801 reviews)
"Always a wonderful place to stay"
United States
Cynthia
The price is AED 535
AED 599 total
includes taxes & fees
9 Nov - 10 Nov
The Evergreen

5. Best Western Corte Madera Inn

Best Western Corte Madera Inn
2.5 star property
Corte Madera
9.0 out of 10, Wonderful, (1,005 reviews)
"Everything was amazing.. Very nice hotel… I would definitely stay here again"
United States
Travis
The price is AED 534
AED 599 total
includes taxes & fees
22 Nov - 23 Nov
Best Western Corte Madera Inn

6. Courtyard San Francisco Larkspur Landing/Marin County

Courtyard San Francisco Larkspur Landing/Marin County
3.0 star property
Larkspur
8.8 out of 10, Excellent, (860 reviews)
"Great stop over for our family."
United States
Kara Lynne
The price is AED 659
AED 740 total
includes taxes & fees
28 Nov - 29 Nov
Courtyard San Francisco Larkspur Landing/Marin County

7. Travelodge by Wyndham Mill Valley/Sausalito

Travelodge by Wyndham Mill Valley/Sausalito
2.0 star property
Mill Valley
7.4 out of 10, Good, (1,003 reviews)
"Perfect and quiet. Will stay again."
United States
Marina
The price is AED 368
AED 413 total
includes taxes & fees
29 Nov - 30 Nov
Travelodge by Wyndham Mill Valley/Sausalito

8. Muir Woods Lodge

Muir Woods Lodge
2.5 star property
Almonte
7.6 out of 10, Good, (1,003 reviews)
"Great location and comfortable room."
United States
Edmund
The price is AED 327
AED 367 total
includes taxes & fees
8 Nov - 9 Nov
Muir Woods Lodge

9. Casa Madrona Hotel & Spa

Casa Madrona Hotel & Spa
4.0 star property
Downtown
9.2 out of 10, Wonderful, (1,006 reviews)
"I loved this hotel. Beautiful accommodations, great location and helpful staff"
United States
Melissa
The price is AED 873
AED 1,075 total
includes taxes & fees
6 Dec - 7 Dec
Casa Madrona Hotel & Spa

10. The Lodge at Tiburon

The Lodge at Tiburon
3.5 star property
Tiburon
8.6 out of 10, Excellent, (1,075 reviews)
"The property and staff were great. We will definitely stay there again!!!"
United States
Tom
The price is AED 637
AED 859 total
includes taxes & fees
8 Nov - 9 Nov
The Lodge at Tiburon

11. Marin Suites Hotel

Marin Suites Hotel
3.0 star property
Corte Madera
8.6 out of 10, Excellent, (1,003 reviews)
"Great stay!"
United States
Jocelyn
The price is AED 497
AED 558 total
includes taxes & fees
15 Nov - 16 Nov
Marin Suites Hotel

12. Waters Edge Hotel

Waters Edge Hotel
3.5 star property
Tiburon
9.8 out of 10, Exceptional, (427 reviews)
"This hotel is great and right on the water with a beautiful deck. The service is really really great as well"
United States
Janet
The price is AED 1,090
AED 1,222 total
includes taxes & fees
30 Nov - 1 Dec
Waters Edge Hotel

13. Hotel Sausalito

Hotel Sausalito
2.5 star property
Downtown
9.0 out of 10, Wonderful, (1,002 reviews)
"Great views from Water side"
United States
Julian
The price is AED 973
AED 1,110 total
includes taxes & fees
15 Nov - 16 Nov
Hotel Sausalito

14. Embassy Suites by Hilton San Rafael at Marin Center

Embassy Suites by Hilton San Rafael at Marin Center
3.5 star property
Las Gallinas
8.8 out of 10, Excellent, (1,007 reviews)
"Clean , staff was excellent"
United States
Shrleen
The price is AED 587
AED 659 total
includes taxes & fees
7 Dec - 8 Dec
Embassy Suites by Hilton San Rafael at Marin Center

15. Marin Lodge

Marin Lodge
2.0 star property
Lincoln
9.6 out of 10, Exceptional, (1,005 reviews)
"Excellent little hotel. Well maintained with easy parking and very quiet."
United States
James
The price is AED 437
AED 490 total
includes taxes & fees
8 Nov - 9 Nov
Marin Lodge

16. The Inn Above Tide

The Inn Above Tide
4.0 star property
Downtown
10.0 out of 10, Exceptional, (20 reviews)
"Overall good property with helpful staffs"
United States
Ugochi
The price is AED 1,934
AED 2,205 total
includes taxes & fees
8 Nov - 9 Nov
The Inn Above Tide

17. The Gables Inn - Sausalito

The Gables Inn - Sausalito
3.0 star property
Sausalito
9.2 out of 10, Wonderful, (1,002 reviews)
"The stock was very friendly. The location is great. Very quiet. Parking is kind of a challenge with the tiny parking lot otherwise overall good stay."
United States
Julianna
The price is AED 980
AED 1,117 total
includes taxes & fees
15 Nov - 16 Nov
The Gables Inn - Sausalito

18. AC Hotel San Rafael Downtown

AC Hotel San Rafael Downtown
4.0 star property
Downtown San Rafael
9.2 out of 10, Wonderful, (365 reviews)
"Kind & friendly, clean rooms, spacious/modern, breakfast was great/cost savings! Conveniently located."
United States
Courtney
The price is AED 804
AED 903 total
includes taxes & fees
4 Dec - 5 Dec
AC Hotel San Rafael Downtown

19. Cavallo Point

Cavallo Point
4.5 star property
Sausalito
9.2 out of 10, Wonderful, (1,002 reviews)
"Service and location were outstanding."
United States
Charles
The price is AED 1,870
AED 2,385 total
includes taxes & fees
20 Nov - 21 Nov
Cavallo Point

20. Villa Inn

Villa Inn
2.0 star property
Lincoln
8.4 out of 10, Very good, (1,004 reviews)
"Cute little motel; helpful staff and clean, well-maintained rooms; good value."
United States
Jack
The price is AED 417
AED 467 total
includes taxes & fees
8 Nov - 9 Nov
Villa Inn
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.

Compare top hotels in Mill Valley

2.5 star property
Almonte
3.0 star property
Downtown Mill Valley
2.5 star property
Mill Valley
2.0 star property
Corte Madera
2.5 star property
Corte Madera
8.8
Excellent
1,003 reviews
9.8
Exceptional
333 reviews
9.4
Exceptional
845 reviews
9.2
Wonderful
801 reviews
9.0
Wonderful
1,005 reviews
The price is AED 559
AED 653 total
includes taxes & fees
8 Nov - 9 Nov
The price is AED 1,090
AED 1,222 total
includes taxes & fees
1 Dec - 2 Dec
The price is AED 1,027
AED 1,152 total
includes taxes & fees
22 Nov - 23 Nov
The price is AED 535
AED 599 total
includes taxes & fees
9 Nov - 10 Nov
The price is AED 534
AED 599 total
includes taxes & fees
22 Nov - 23 Nov
  • Yes, Breakfast included
  • Yes, Pool
  • No Spa
  • Yes, Pet friendly
  • Yes, WiFi included
  • Yes, Parking
  • Yes, Breakfast included
  • No Pool
  • No Spa
  • Yes, Pet friendly
  • Yes, WiFi included
  • Yes, Parking
  • Yes, Breakfast included
  • No Pool
  • No Spa
  • Yes, Pet friendly
  • Yes, WiFi included
  • Yes, Parking
  • No Breakfast included
  • No Pool
  • No Spa
  • No Pet friendly
  • Yes, WiFi included
  • Yes, Parking
  • Yes, Breakfast included
  • Yes, Pool
  • No Spa
  • Yes, Pet friendly
  • Yes, WiFi included
  • Yes, Parking
Save an average of 15% on thousands of hotels when you're signed in

Where to stay in Mill Valley

Find the best Mill Valley areas and neighborhoods for the activities you enjoy most.

Almonte

Located 14 miles north of San Francisco, this picturesque city offers stunning views of Mount Tamalpais and Richardson Bay. Explore the nearby Muir Woods National Monument for a serene nature experience.

Downtown Mill Valley

If you're spending some time in Downtown Mill Valley, Sweetwater Music Hall and Lytton Square are top sights worth seeing.

Alto Sutton Manor

While there might not be top attractions in Alto Sutton Manor, you can explore the larger area and discover places like Sweetwater Music Hall and Richardson Bay Audubon Center.

Stay near popular Mill Valley attractions

Learn more about Mill Valley

Nestled at the foot of Mount Tamalpais, this charming town offers scenic hiking trails and redwood groves in Muir Woods National Monument. Explore the quaint downtown's art galleries and cafes, or catch a show at the historic Sweetwater Music Hall.

A wooden pathway winding through a dense forest with tall trees and lush greenery.

Top Mill Valley Hotel Reviews

More cheap stays in Mill Valley

Hotels in Mill Valley with star-rating

Find out more about Mill Valley

Top reasons to visit Mill Valley

  • Stunning Natural Scenery: Mill Valley offers breathtaking views and outdoor adventures, perfect for nature lovers.
  • Charming Downtown: Explore a vibrant downtown area filled with music venues, boutiques, and friendly locals.
  • Outdoor Activities: Engage in various activities, from hiking to visiting beautiful beaches and parks.
  • Diverse Accommodations: Choose from charming inns to upscale resorts, catering to all types of travelers.
  • Unique Attractions: Enjoy local shopping centers and cultural experiences for a memorable vacation.

Find great hotels near Mill Valley

Discover a variety of hotel accommodations in Mill Valley, California, perfect for business travelers, families, and those seeking a shopping getaway. From charming inns to upscale resorts, you'll find options that cater to your every need. Explore hotel reviews and uncover the best places to stay, ensuring a memorable vacation experience in this beautiful part of the United States.

  • Hotel Riu Plaza Fisherman's Wharf: Nestled 16.1km from Mill Valley, this 4-star hotel offers a vibrant beach vacation experience in a shopping district. Ideal for travelers seeking an LGBTQIA-friendly environment, Hotel Riu Plaza is directly accessible to the beach, making it perfect for those who enjoy sun and surf. The hotel also caters to shopping enthusiasts, allowing guests to indulge in local boutiques and dining options. With its lively atmosphere and welcoming ambiance, this hotel stands out as a top choice for a fun-filled getaway.
  • Holiday Inn Golden Gateway by IHG: Situated 17.7km from Mill Valley, this 3.5-star hotel is a prime choice for business travelers and city explorers alike. Located in the heart of the city, the Holiday Inn Golden Gateway offers easy access to San Francisco’s bustling attractions and business districts. Its modern amenities and comfortable accommodations ensure a productive stay, while the vibrant city atmosphere allows for delightful exploration during downtime. With a focus on convenience, this hotel caters perfectly to those looking for a blend of work and leisure.
  • Hilton San Francisco Financial District: Also 17.7km from Mill Valley, the Hilton San Francisco Financial District is a refined 4-star hotel that caters to families and LGBTQIA travelers. Located in the city center, this hotel offers a welcoming environment and special amenities for children, including free cribs and family-friendly services. Guests can expect a sophisticated stay with easy access to iconic city sights, all while enjoying modern comforts. Its combination of luxury and family-oriented features makes it an excellent choice for those traveling with loved ones.

Where to stay in and around Mill Valley

Mill Valley, California, offers a perfect blend of outdoor adventure and scenic beauty, making it an ideal vacation spot. Explore the charming downtown area, filled with music venues and friendly locals. Don't miss the awesome stay opportunities and the picturesque Haypress Campsite for a taste of nature. Nearby cities provide an urban atmosphere, ensuring a family-friendly experience for all travelers looking to unwind and explore.

  • San Francisco: A vibrant metropolis located 17.7km from Mill Valley, San Francisco is renowned for its iconic landmarks and diverse cultural experiences. Visitors flock to the city year-round, with peak travel occurring from June to August. Families and outdoor enthusiasts will find plenty to enjoy, from the bustling shopping areas to the picturesque bay views. Must-visit attractions include the Golden Gate Bridge, Fisherman’s Wharf, and various sports facilities. With its unique neighborhoods and rich history, a trip to San Francisco promises an unforgettable urban adventure.
  • Corte Madera: Just 3.2km from Mill Valley, Corte Madera is a charming city that offers a blend of outdoor activities and scenic beauty. With visitor numbers peaking in March to April and July, this city caters to adventure seekers and nature lovers alike. Explore the lush nature reserves and national parks, or enjoy recreational areas perfect for family outings. Corte Madera’s convenient access to various educational venues and wellness treatments make it a great stop for those looking to recharge while enjoying the great outdoors.
  • Muir Beach: Nestled in the vicinity of Mill Valley, Muir Beach is a quaint village that attracts visitors seeking breathtaking natural scenery and outdoor adventures. With a moderately seasonal influx of travelers peaking in April and June to July, Muir Beach is perfect for those looking to experience the beauty of California's coastline. Enjoy activities at the local beach and nature reserves, or take a stroll along the scenic boardwalk. This charming destination offers a peaceful retreat, ideal for relaxation and exploration in nature.

Things to do in and around Mill Valley

Mill Valley is a fantastic destination for outdoor enthusiasts, adventure seekers, and nature lovers. Enjoy a variety of activities, including exploring recreational areas, shopping in charming boutiques, and visiting local shopping centers. Don't miss the breathtaking scenery and area attractions that showcase the beauty of this vibrant community, making it an ideal spot for a memorable vacation.

Shopping

For a delightful shopping experience in Mill Valley, visit Book Passage, a charming store just 3.2km away. You can also explore the Marin County Civic Center Farmers' Market, located 9.7km away, for fresh local goods. If you're up for a drive, Ghirardelli Square, 16.1km away, offers a vibrant shopping atmosphere.

Recreation

Experience the vibrant atmosphere at Sweetwater Music Hall, where live music creates an uplifting ambiance. Enjoy the serene beauty of the Golden Gate National Recreation Area, perfect for relaxation and outdoor activities. For indulgent pampering, visit Stellar Spa, offering rejuvenating body treatments just 3.2km away.

Adventure

Explore the Tennessee Valley Trailhead for a scenic hiking experience through lush landscapes. The Dipsea Trailhead offers thrilling trails perfect for outdoor enthusiasts. For water sports, visit Boardsports Marin, located 4.8km from Mill Valley, where you can enjoy exciting activities on the water.

Nightlife

Experience a cozy night at the Throckmorton Theater, where you can enjoy captivating films in a romantic setting. For a taste of culture, visit the Marin Theatre Company. For drinks, the American Legion Log Cabin offers a lively atmosphere just 8.0km away, perfect for mingling and entertainment.

*Distances are measured in a straight line; actual driving distances may vary depending on the route.

Booking tips and Expedia advantages for Mill Valley

To save money during your visit to Mill Valley, plan your trip in February or November to December, when accommodation prices drop. Sundays are the least expensive days to stay, while Tuesdays are the priciest. Take advantage of free attractions like Pier 39 and the Presidio of San Francisco. Use public transit to cut transportation costs, and consider booking through Expedia for package deals on flights and hotels. Filter for eco-certified options to find budget-friendly stays and arrange results by price for the best deals.

  • The most and least expensive months on average to stay in a hotel: The cheapest months to stay in Mill Valley are February and November to December, where the prices are slightly lower. This is in comparison to August to October, where prices are slightly higher.
  • The most and least expensive days on average to stay in a hotel: The least expensive day to stay in Mill Valley is Sunday. The most expensive day to stay in Mill Valley is Tuesday.
  • Find cheap hotels on Expedia: Utilize Expedia's search tool to refine your options based on your budget, desired location, and preferred hotel type. For instance, selecting the Eco-certified filter will showcase sustainable and environmentally-friendly hotels that are currently available. To find the best prices and deals, simply arrange the price filter from lowest to highest.
  • Consider bundling your trip: You can save money by combining your hotel stay in Mill Valley with your flights and activities through an Expedia package deal.

Find the best attractions in and around Mill Valley

Mill Valley is the perfect destination for outdoor enthusiasts and adventure seekers, offering stunning scenery and a variety of attractions. Visitors can explore beautiful beaches, vibrant urban parks, and even a nudist beach. The area's points of interest cater to those seeking cultural experiences and family-friendly activities, ensuring a memorable vacation filled with diverse experiences.

  • Muir Woods National Monument: Immerse yourself in the majestic beauty of ancient coastal redwoods in this serene national monument. With towering trees and peaceful trails, Muir Woods offers a perfect escape for nature lovers and adventure seekers alike.
  • Golden Gate Bridge: Experience one of the most iconic landmarks in the world. This historic bridge, located 12.9km from Mill Valley, is a symbol of San Francisco and offers stunning views, making it a must-visit for culture enthusiasts.
  • Pier 39: Enjoy a lively atmosphere at this bustling jetty, 16.1km from Mill Valley. With shops, restaurants, and sea lion sightings, Pier 39 provides a delightful mix of urban charm and scenic views, perfect for families and friends.

Best time to go to Mill Valley

The best time to visit Mill Valley is dependent on what kind of holiday you are seeking. September is its hottest month on average. At this time, visitor numbers are average and weather is sunny with no rain. December is its coolest month on average. At this time, visitor numbers are slightly low and weather is mostly sunny with light rain.

calendarCalendar MonthtemperatureTemperaturerainPrecipitationmostlyCloudinessoccupationOccupancypricePricing
January50.7°F (10.4°C)Light RainMostly SunnySlightly LowAverage
February51.4°F (10.8°C)Light RainMostly SunnyAverageSlightly Low
March52.5°F (11.4°C)Light RainMostly SunnySlightly HighAverage
April54.9°F (12.7°C)No RainMostly SunnySlightly HighAverage
May57.6°F (14.2°C)No RainMostly SunnyAverageAverage
June61.3°F (16.3°C)No RainSunnyAverageAverage
July62.1°F (16.7°C)No RainSunnySlightly HighAverage
August63.1°F (17.3°C)No RainSunnyAverageSlightly High
September63.7°F (17.6°C)No RainSunnyAverageSlightly High
October61.2°F (16.2°C)No RainSunnyAverageSlightly High
November55.0°F (12.8°C)Light RainMostly SunnySlightly LowSlightly Low
December50.5°F (10.3°C)Light RainMostly SunnySlightly LowSlightly Low

The nearest major airports for your trip to Mill Valley

When planning your visit to Mill Valley, California, you can choose from several major airports. San Francisco International Airport (SFO) is located 35.4km away, with luxury hotel options like the Fairmont San Francisco and Palace Hotel, both 19.3km from the airport, offering transfers and shuttles. Oakland International Airport (OAK) is 37.0km away, with nearby hotels such as Claremont Resort & Club, which is 16.1km from OAK. Lastly, Norman Y. Mineta San Jose International Airport (SJC) is 80.5km from Mill Valley, with top hotels like the Shashi Hotel Mountain View and Santa Clara Marriott, both conveniently located 3 to 14.5km from SJC.

Frequently asked questions

What's the best place for a stay in Mill Valley?
Located 10.6 mi (17 km) from the heart of Mill Valley, Holiday Inn Golden Gateway by IHG is a top choice for your stay based on our traveler data. Two other options for your visit to the area are Hotel Riu Plaza Fisherman's Wharf and Handlery Union Square Hotel. See all available top hotels, or vacation rentals in Mill Valley.
What are some of the best vacation rentals in Mill Valley?
Spacious Serene Sanctuary-Minutes to SF and Muir Woods: Visitors give good reviews to this Mill Valley vacation home rental, which is located in the city center and has a fireplace, a patio, and laundry facilities to put you at ease in your new surroundings. It has 4 bedrooms as well as a kitchen with a dishwasher, a fridge, and a stovetop, so you can cook with friends or family. You can relax into your vacation with a garden and a selection of games. See all vacation rentals in Mill Valley.
If I need to cancel my hotel reservation in Mill Valley, will I receive a refund?
Yes! The majority of hotel bookings are fully refundable if you cancel prior to the accommodation's cancellation deadline, which in most cases is within 24 or 48 hours of the scheduled arrival. If you have a non-refundable reservation, you may still be able to cancel and receive a refund within a 24-hour period of your booking. Filter your search by fully refundable to find flexible hotel deals in Mill Valley.
Where can I learn more about changing or cancelling my trip to Mill Valley?
To access more information about changing or cancelling your trip to Mill Valley, click here.
What's the best place to stay on a budget in Mill Valley?
Based on our traveler reviews, Muir Woods Lodge is a top choice for a less expensive stay. View all budget hotels in Mill Valley.
What's the best accommodation for a family trip to Mill Valley?
Holiday Inn Express Mill Valley San Francisco Area by IHG is a hotel with an outdoor pool and free parking, and it's a top choice on Expedia for families. Attractions in the area like Bay Area Discovery Museum and Aquarium of the Bay are also fun for kids of all ages. Find more child-friendly accommodations in Mill Valley.
What is the top LGBTQ-friendly place to stay in Mill Valley?
Holiday Inn Express Mill Valley San Francisco Area by IHG is a top LGBTQ-friendly hotel, and features free breakfast and free WiFi.
What's the best pet-friendly hotel in Mill Valley?
Acqua Hotel is a top dog-friendly hotel, and offers concierge services along with free WiFi for its human guests. Two other good options to stay with your pet include Holiday Inn Express Mill Valley San Francisco Area by IHG and Mill Valley Inn. See more pet-friendly hotel accommodations in Mill Valley.
Where is the best hotel to stay near Muir Woods National Monument?
Mill Valley Inn is one of the top choices for your stay based on our traveler data, and this 3-star hotel offers free parking and private balconies. It's located 1.8 mi (2.9 km) from Muir Woods National Monument.
What are some accommodations with pools in Mill Valley?
Holiday Inn Golden Gateway by IHG: Hotel, 10-minute walk from SF Masonic Auditorium. Features a snack bar/deli, an outdoor pool, and complimentary wireless internet access. Hotel Riu Plaza Fisherman's Wharf and Handlery Union Square Hotel are a couple of other choices that offer an onsite pool. View all hotels with pools in Mill Valley.
What is the best hotel near San Francisco International Airport (SFO)?
El Rancho Inn, Signature Collection is a popular 3-star property featuring free breakfast and a restaurant. It's located a short 0.8 mi (1.3 km) from San Francisco Intl. Airport. Other good options within close proximity to the airport include La Quinta Inn & Suites by Wyndham San Francisco Airport West and Bay Landing San Francisco Airport Hotel.
What's it like staying in Mill Valley?
Nature enthusiasts will enjoy exploring Mill Valley, and visitors give high marks for the beautiful forests and top-notch restaurants. This city also attracts tourists with its shopping. Top sights around the area include Muir Woods National Monument, Pier 39, and Oracle Park. In Mill Valley, there are 167 hotels and other accommodations to choose from. Find out more about Mill Valley.
What should I see while I'm in Mill Valley?
Cultural venues include Sweetwater Music Hall, Throckmorton Theater, and Marin Theatre Company. The forests and hiking trails highlight the natural beauty with places to discover including Muir Woods National Monument, Old Mill Park, and Golden Gate National Recreation Area. You'll also find Pier 39 and Oracle Park in the area. Check out what more to see and do in Expedia's Mill Valley guide.
What's the seasonal weather like in Mill Valley?
The hottest months are usually September and August with an average temp of 63°F, while the coldest months are January and February with an average of 51°F. Average annual precipitation for Mill Valley is 21 inches.