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Our top choices for O'Fallon hotels

Drury Inn & Suites St. Louis O'Fallon, IL

Drury Inn & Suites St. Louis O'Fallon, IL
3.0 star property
O'Fallon
9.6 out of 10, Exceptional, (1,001 reviews)
  • cleanliness
    Stylish comfort in O'Fallon with indoor and outdoor pools for year-round enjoyment.
"Great place"
United States
Terry
The price is AED 389
AED 452 total
includes taxes & fees
8 Feb - 9 Feb
Drury Inn & Suites St. Louis O'Fallon, IL

Comfort Inn & Suites O'Fallon - St. Louis Area

Comfort Inn & Suites O'Fallon - St. Louis Area
2.0 star property
O'Fallon
7.0 out of 10, Good, (102 reviews)
  • cleanliness
    Serene getaway near St. Louis with helpful staff and easy airport access.
"Very friendly staff."
United States
Erica
The price is AED 215
AED 248 total
includes taxes & fees
15 Feb - 16 Feb
Comfort Inn & Suites O'Fallon - St. Louis Area

Hampton Inn O'Fallon

Hampton Inn O'Fallon
2.5 star property
O'Fallon
9.2 out of 10, Wonderful, (821 reviews)
  • cleanliness
    Experience modern comforts near St. Louis with an indoor pool and friendly service.
"Very friendly staff, clean room, and great view from the 4th floor. Will definitely stay here again. "
United States
Kobe
The price is AED 404
AED 468 total
includes taxes & fees
8 Feb - 9 Feb
Hampton Inn O'Fallon

Fairfield Inn & Suites by Marriott O'Fallon, IL

Fairfield Inn & Suites by Marriott O'Fallon, IL
2.5 star property
O'Fallon
9.4 out of 10, Exceptional, (337 reviews)
  • cleanliness
    Experience comfort and convenience near St. Louis in O'Fallon, Illinois.
"Nice hotel and rooms"
United States
George
The price is AED 509
AED 585 total
includes taxes & fees
15 Feb - 16 Feb
Fairfield Inn & Suites by Marriott O'Fallon, IL

Holiday Inn Express & Suites O'Fallon/Shiloh by IHG

Holiday Inn Express & Suites O'Fallon/Shiloh by IHG
2.5 star property
O'Fallon
8.4 out of 10, Very Good, (571 reviews)
"Very courteous staff, good breakfast selection, "
United States
Dale
The price is AED 466
AED 518 total
includes taxes & fees
8 Feb - 9 Feb
Holiday Inn Express & Suites O'Fallon/Shiloh by IHG

TownePlace Suites by Marriott St. Louis O'Fallon

TownePlace Suites by Marriott St. Louis O'Fallon
3.0 star property
O'Fallon
9.0 out of 10, Wonderful, (135 reviews)
  • cleanliness
    Spacious hotel near O'Fallon Family Sports Park with indoor pool and fitness.
"Everything was clean and nice. The staff was very accommodating. "
United States
Tricia
The price is AED 448
AED 520 total
includes taxes & fees
15 Feb - 16 Feb
TownePlace Suites by Marriott St. Louis O'Fallon

La Quinta Inn & Suites by Wyndham O'Fallon, IL - St. Louis

La Quinta Inn & Suites by Wyndham O'Fallon, IL - St. Louis
3.0 star property
O'Fallon
6.0 out of 10, (1,002 reviews)
  • cleanliness
    Enjoy a peaceful night's sleep at this hotel near St. Louis with indoor pool.
"Clean bed and room. Very nice staff"
United States
Nita
The price is AED 228
AED 262 total
includes taxes & fees
1 Feb - 2 Feb
La Quinta Inn & Suites by Wyndham O'Fallon, IL - St. Louis

Super 8 by Wyndham O'Fallon

Super 8 by Wyndham O'Fallon
2.0 star property
O'Fallon
7.0 out of 10, Good, (1,000 reviews)
  • cleanliness
    Enjoy the comfort of a quiet, convenient O'Fallon stay near St. Louis.
"The staff was very friendly and the room looked fantastic "
United States
Nash
The price is AED 172
AED 197 total
includes taxes & fees
8 Feb - 9 Feb
Super 8 by Wyndham O'Fallon

Quality Inn O'Fallon IL - St. Louis

Quality Inn O'Fallon IL - St. Louis
3.0 star property
O'Fallon
7.4 out of 10, Good, (1,000 reviews)
  • cleanliness
    Peaceful retreat with an indoor pool and prime O'Fallon location off Highway 64.
"Great place to stay, very helpful ataff!"
United States
Daniel
The price is AED 188
AED 217 total
includes taxes & fees
1 Feb - 2 Feb
Quality Inn O'Fallon IL - St. Louis

Sleep Inn O'Fallon near I-64

Sleep Inn O'Fallon near I-64
2.5 star property
O'Fallon
7.0 out of 10, Good, (898 reviews)
  • cleanliness
    Enjoy a comfortable getaway with free dining and leisure perks in O'Fallon.
"The room was clean and the staff was very pleasant"
United States
Andrew
The price is AED 206
AED 237 total
includes taxes & fees
8 Feb - 9 Feb
Sleep Inn O'Fallon near I-64

Hilton Garden Inn St. Louis Shiloh/O'Fallon IL

Hilton Garden Inn St. Louis Shiloh/O'Fallon IL
3.0 star property
O'Fallon
8.0 out of 10, Very Good, (949 reviews)
  • cleanliness
    Convenient O'Fallon stay with indoor pool and dining near family sports park.
" Great stay !"
United States
Ana
The price is AED 365
AED 423 total
includes taxes & fees
8 Feb - 9 Feb
Hilton Garden Inn St. Louis Shiloh/O'Fallon IL

Baymont by Wyndham O'Fallon St. Louis Area

Baymont by Wyndham O'Fallon St. Louis Area
2.5 star property
O'Fallon
5.6 out of 10, (445 reviews)
  • cleanliness
    Tranquil O'Fallon retreat with free breakfast near sports park and bowling alley.
"Nice room good price "
United States
James
The price is AED 205
AED 236 total
includes taxes & fees
1 Feb - 2 Feb
Baymont by Wyndham O'Fallon St. Louis Area

Candlewood Suites O Fallon by IHG

Candlewood Suites O Fallon by IHG
2.5 star property
O'Fallon
7.8 out of 10, Good, (411 reviews)
  • cleanliness
    Enjoy this comfortable O'Fallon hotel near St. Clair Bowl with business amenities.
"Great rooms for living on the road."
United States
Jeff
The price is AED 327
AED 376 total
includes taxes & fees
8 Feb - 9 Feb
Candlewood Suites O Fallon by IHG

Welcome Suites

Welcome Suites
2.0 star property
O'Fallon
5.4 out of 10, (203 reviews)
  • cleanliness
    Experience comfort at this fitness-friendly hotel near O'Fallon Family Sports Park.
"Love this place "
United States
Tiwan
Welcome Suites

Extended Stay America Select Suites - St. Louis - O' Fallon, IL

Extended Stay America Select Suites - St. Louis - O' Fallon, IL
2.5 star property
O'Fallon
7.6 out of 10, Good, (871 reviews)
  • cleanliness
    Enjoy a spacious, well-appointed suite in O'Fallon with easy access to local parks.
"This was my extension and it was just as good as the first night. Quiet and i slept like a rock!"
United States
Diane
The price is AED 278
AED 319 total
includes taxes & fees
6 Feb - 7 Feb
Extended Stay America Select Suites - St. Louis - O' Fallon, IL

Hampton Inn St. Louis - Columbia

Hampton Inn St. Louis - Columbia
2.5 star property
Columbia
8.6 out of 10, Excellent, (482 reviews)
  • cleanliness
    Relax at this Columbia hotel with indoor swimming and 24-hour fitness.
"Everything was clean, the staff was pleasant. I had a good stay."
United States
Elizabeth
The price is AED 352
AED 391 total
includes taxes & fees
23 Feb - 24 Feb
Hampton Inn St. Louis - Columbia

The Principal Hotel

The Principal Hotel
3.5 star property
Columbia
9.8 out of 10, Exceptional, (205 reviews)
  • cleanliness
    Enjoy modern comforts near St. Louis with free WiFi and parking at this Columbia hotel.
"Great stay and very clean!"
United States
David
The price is AED 381
AED 423 total
includes taxes & fees
3 Mar - 4 Mar
The Principal Hotel

Casino Queen Hotel

Casino Queen Hotel
3.0 star property
East St. Louis
7.6 out of 10, Good, (1,997 reviews)
  • cleanliness
    Enjoy a serene escape with a casino and stunning views of Gateway Arch.
"Yes it was a great stay"
United States
Suzy
The price is AED 309
AED 358 total
includes taxes & fees
1 Feb - 2 Feb
Casino Queen Hotel

Drury Inn & Suites St. Louis Collinsville

Drury Inn & Suites St. Louis Collinsville
3.0 star property
Eastport
9.6 out of 10, Exceptional, (1,000 reviews)
"Great Experience, Great Staff!!!"
United States
Kyle
The price is AED 360
AED 414 total
includes taxes & fees
8 Feb - 9 Feb
Drury Inn & Suites St. Louis Collinsville

Holiday Inn Express & Suites Edwardsville by IHG

Holiday Inn Express & Suites Edwardsville by IHG
2.5 star property
Edwardsville
9.2 out of 10, Wonderful, (842 reviews)
  • cleanliness
    Stay close to Edwardsville Arts Center with free breakfast and indoor pool.
"Very good staff and great breakfast service."
United States
Denise
The price is AED 459
AED 528 total
includes taxes & fees
8 Feb - 9 Feb
Holiday Inn Express & Suites Edwardsville by IHG
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.
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Stay near popular O'Fallon attractions

Learn more about O'Fallon

Family-friendly parks and splash pads make O'Fallon perfect for outdoor adventures with kids of all ages. Sports fans can catch minor league baseball at CarShield Field, while history buffs explore the charming downtown area's local shops and eateries.

Stone canal lock and waterfall beside gazebo in peaceful town park

Top O'Fallon Hotel Reviews

More cheap stays in O'Fallon

Hotels in O'Fallon with star-rating

Find out more about O'Fallon

Top reasons to visit O'Fallon

  • Family-Friendly Attractions: O'Fallon offers a variety of activities suitable for all ages, ensuring a fun vacation for families.
  • Outdoor Adventures: Enjoy recreational opportunities at O'Fallon Family Sports Park and picturesque urban parks.
  • Cultural Experiences: Explore local art galleries and community events that showcase the town's creativity and heritage.
  • Welcoming Atmosphere: The neighborhoods in O'Fallon provide a friendly environment for visitors, including pet-friendly accommodations.
  • Budget-Friendly Options: O'Fallon features affordable lodging and activities, perfect for those looking to unwind without breaking the bank.

Find great hotels in and around O'Fallon

Explore a variety of hotel accommodation options in O'Fallon, Illinois, catering to both leisure and business travelers. Whether you're seeking a comfortable motel or a more upscale hotel, the area offers pet-friendly options and welcoming environments for LGBTQIA guests. From the renowned Sleep Inn to spacious suites, you'll find the ideal place to relax and enjoy your stay in this charming city.

  • Hyatt Regency St. Louis at The Arch: Experience a blend of sophistication and comfort at the Hyatt Regency St. Louis at The Arch, a premier 4-star hotel located 24.1km from O'Fallon. This property is ideal for both business travelers and leisure seekers, offering a pet-friendly environment for those wishing to bring their furry companions along. Guests will appreciate the modern amenities, including spacious rooms and a dedicated workspace. The hotel's prime location provides easy access to iconic attractions, ensuring that you enjoy a memorable stay while indulging in top-notch service and facilities.
  • Drury Plaza Hotel St. Louis at the Arch: This welcoming 3-star hotel, situated 24.1km away from O'Fallon, is perfect for families and LGBTQIA travelers. The Drury Plaza Hotel offers a warm, inclusive atmosphere with amenities designed for all ages, including complimentary cribs for younger guests. It also welcomes pets, making it a great choice for those traveling with their furry friends. With a range of family-friendly services and a convenient location near local attractions, guests can enjoy a delightful stay filled with comfort and hospitality.
  • Welcome Suites: Located in the heart of O'Fallon, Welcome Suites is a versatile lodging option that caters to a diverse range of travelers, including business professionals and LGBTQIA guests. This pet-friendly hotel offers a welcoming environment with amenities to ensure a comfortable stay. With its convenient location and modern facilities, Welcome Suites provides a home away from home for those seeking a blend of relaxation and productivity. The property allows pets, ensuring that you can enjoy your vacation without leaving your furry companions behind.

Where to stay near O'Fallon

Discover the charm of O'Fallon, Illinois, where family-friendly attractions and outdoor adventures await. Enjoy leisurely strolls through the picturesque parks or explore nearby neighborhoods that offer a welcoming atmosphere and vibrant local culture. With low crowds and budget-friendly options, you can unwind while discovering the rich experiences O'Fallon has to offer. Don't miss the chance to create unforgettable memories in this delightful city and its surrounding regions.

  • St. Louis: A vibrant metropolis located 25.7km from O'Fallon, St. Louis offers a rich blend of culture and entertainment. The city experiences a steady influx of travelers, with peak visits from June to August. Families and outdoor enthusiasts flock to St. Louis for its array of attractions, including arena entertainment facilities and arcade adventure zones. Notable landmarks like the sports stadium and urban parks provide ample opportunities for leisure and exploration. Whether you're looking to catch a game or enjoy a day in nature, St. Louis has something for everyone.
  • Shiloh: Just 3.2km away from O'Fallon, Shiloh is a charming city that welcomes visitors year-round, with peak times in April and summer months. Known for its family-friendly atmosphere, Shiloh features shopping centers and educational venues that cater to diverse interests. The city’s local landmarks, including national parks and lush forests, offer scenic views and recreational activities. Shiloh is an ideal spot for those looking to enjoy a quieter pace while still being close to the excitement of the surrounding areas.
  • Fairview Heights: Located 8.0km from O'Fallon, Fairview Heights is a bustling city that attracts visitors seeking a mix of family fun and outdoor activities. With peak travel times in April and summer, this city boasts a variety of attractions such as arena entertainment facilities and shopping malls. Visitors can enjoy the local sports stadium, event conference venues, and motor racing, making it a hub for entertainment. Fairview Heights is a great destination for those looking to indulge in shopping and lively events while exploring the local culture.

Things to do in and around O'Fallon

O'Fallon, Illinois, is an ideal destination for family vacations, offering a range of outdoor and entertainment activities. Visitors can enjoy an arena entertainment facility, local theaters, and educational events. Don't miss the vibrant art galleries and various town events that highlight the community's culture and creativity. O'Fallon promises an enjoyable experience for all ages.

Shopping

In O'Fallon, visit St. Claire Square Mall, just 6.4km away, offering a vibrant shopping experience with entertainment options. Don't miss Kruta Bakery, located 11.3km away for delicious treats. If you're up for a drive, check out Soulard Farmer's Market, situated 25.7km from O'Fallon.

Recreation

O'Fallon Family Sports Park offers a vibrant sports atmosphere with various athletic fields and walking trails for fitness enthusiasts. Stonewolf Golf Course, located 8.0km away, provides a picturesque setting for golf lovers. Pleasant Ridge Park, also 8.0km from O'Fallon, invites relaxation with its serene natural beauty.

Adventure

At World Wide Technology Raceway, 20.9km from O'Fallon, experience the thrill of high-speed motor racing. Splash City Family Waterpark, located 14.5km away, offers a fun-filled day of water slides and activities for the whole family. Enjoy adventure at Lazer Force Lazer Tag & Pedal Karts, just 12.9km from O'Fallon.

Nightlife

Experience the fun at St. Clair Bowl, an exciting arcade adventure zone perfect for families. For a cinematic experience, catch a movie at The Edge, just 12.9km away, offering romance and entertainment. Gateway Fun Park, 14.5km from O'Fallon, promises more adventure and family-friendly vibes.

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

Booking tips and Expedia advantages for O'Fallon

To save money during your visit to O'Fallon, Illinois, take advantage of free entry to attractions like the National Shrine of Our Lady of the Snows. Use public transportation options such as buses or walking to minimize travel costs. Plan your trip during the cheaper months of December to February, and consider booking your stay on a Monday for the best rates. Utilize Expedia’s search tool to find budget-friendly accommodations, and look for package deals that combine hotels with flights and activities for additional savings.

  • The most and least expensive months on average to stay in a hotel: The cheapest months to stay in O'Fallon are December to February, where the prices are slightly lower. This is in comparison to May to July, 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 O'Fallon is Monday. The most expensive day to stay in O'Fallon is Saturday.
  • Find cheap hotels on Expedia: Expedia’s search tool enables you to set your budget, choose your ideal location, and more. You can easily sort your results to display hotels from the lowest to the highest prices, so you can find the most affordable options right away. Additionally, you have the option to narrow down your choices by hotel type; for instance, selecting the Eco-certified filter will showcase sustainable and environmentally friendly hotels that are available for booking.
  • Consider bundling your trip: You can save money by combining your O'Fallon hotel reservation with your flights and activities through an Expedia package.

Find the best attractions near O'Fallon

O'Fallon, Illinois, offers a delightful mix of family-friendly and outdoor activities, making it a great vacation spot. Visitors can explore urban parks, monuments, and modern college campuses. Key attractions include the O'Fallon Family Sports Park, perfect for those seeking recreational fun. Whether you’re interested in culture or outdoor experiences, O'Fallon has something to cater to every traveler’s interests.

  • Gateway Arch: Standing majestically at 630 feet, the Gateway Arch symbolizes westward expansion in America. Located 24.1km from O'Fallon, this stunning monument offers breathtaking views of the St. Louis skyline and the Mississippi River, making it a must-visit for culture enthusiasts.
  • McKendree University: Situated only 8.0km away, McKendree University is a vibrant institution known for its modern campus and diverse programs. Experience the lively city vibes as you explore its beautiful grounds and engage with students and faculty.
  • Gateway Conference Center: Just 12.9km from O'Fallon, this premier event venue hosts various conferences and meetings. With its professional atmosphere and state-of-the-art facilities, it's perfect for business travelers looking to network or attend events.

Best time to go to O'Fallon

The best time to visit O'Fallon is dependent on what kind of holiday you are seeking. July is its hottest month on average. At this time, visitor numbers are slightly high and weather is mostly sunny with light rain. January is its coolest month on average. At this time, visitor numbers are average and weather is mostly cloudy with light rain.

calendarCalendar MonthtemperatureTemperaturerainPrecipitationmostlyCloudinessoccupationOccupancypricePricing
January31.6°F (-0.2°C)Light RainMostly CloudyAverageSlightly Low
February34.9°F (1.6°C)Light RainMostly SunnyAverageSlightly Low
March46.2°F (7.9°C)Light RainMostly SunnyAverageAverage
April55.8°F (13.2°C)Light RainMostly SunnySlightly HighAverage
May66.2°F (19.0°C)Light RainMostly SunnyAverageSlightly High
June75.6°F (24.2°C)Light RainMostly SunnySlightly HighSlightly High
July77.9°F (25.5°C)Light RainMostly SunnySlightly HighSlightly High
August76.1°F (24.5°C)Light RainMostly SunnyAverageAverage
September70.2°F (21.2°C)Light RainMostly SunnyAverageAverage
October58.3°F (14.6°C)Light RainMostly SunnySlightly LowAverage
November45.9°F (7.7°C)Light RainMostly SunnySlightly LowAverage
December37.6°F (3.1°C)Light RainMostly SunnySlightly LowSlightly Low

The nearest major airports for your trip to O'Fallon

Traveling to O'Fallon, Illinois, is convenient with nearby airports. St. Louis Lambert International Airport (STL) is approximately 43.5km away, offering several excellent hotels such as The Ritz-Carlton, St. Louis (5-star, 11.3km from STL), and the Royal Sonesta Chase Park Plaza (4.5-star, 14.5km from STL). Alternatively, Spirit of St. Louis Airport (SUS) is around 64.4km from O'Fallon, with options like the DoubleTree by Hilton Hotel St. Louis - Chesterfield (4-star, 6.4km from SUS) and The Wildwood Hotel (3.5-star, 9.7km from SUS). Both airports provide accessible transportation services to these hotels, ensuring a smooth travel experience.

Frequently asked questions

What's the best place to stay in O'Fallon?
Drury Inn & Suites St. Louis O'Fallon, IL is ranked highly by Expedia customers. This hotel offers free breakfast and an outdoor pool. Reviews from our site also recommend Hampton Inn O'Fallon and Fairfield Inn & Suites by Marriott O'Fallon, IL as top options for your trip. See all available top hotels, or vacation rentals in O'Fallon.
What's the top vacation rental in O'Fallon?
Entire 4BR Home near Lafayette Square: This vacation home rental near O'Fallon offers a patio, a selection of games, and a barbecue grill to help you feel perfectly comfortable 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. See all vacation rentals in O'Fallon.
If I need to cancel my hotel reservation in O'Fallon, will I receive a refund?
Yes! Most room reservations are fully refundable if cancelled prior to the accommodation's cancellation deadline, which is usually within 24-48 hours of your check-in date. If you booked a non-refundable reservation, you might still have the option to cancel and get a refund within 24 hours of booking. Filter your search by fully refundable to find flexible hotel deals in O'Fallon.
Where can I learn more about changing or cancelling my trip to O'Fallon?
For more information about changing or cancelling your trip to O'Fallon, head over to our customer service page.
What's the best hotel when traveling with kids to O'Fallon?
La Quinta Inn & Suites by Wyndham O'Fallon, IL - St. Louis is a hotel with an indoor pool and free parking, and it's a top choice on Expedia for families. Other good choices for your kid-friendly vacation include Super 8 by Wyndham O'Fallon and Drury Inn & Suites St. Louis O'Fallon, IL. Kids of all ages will also enjoy a visit to St. Clair Bowl. Find more child-friendly accommodations in O'Fallon.
What is the favorite LGBTQ-friendly hotel in O'Fallon?
Baymont by Wyndham O'Fallon St. Louis Area is a top LGBTQ-friendly hotel that features free breakfast and free WiFi. Hilton Garden Inn St. Louis Shiloh/O'Fallon IL and Drury Inn & Suites St. Louis O'Fallon, IL are other good options for your vacation.
What's the best pet-friendly place to stay in O'Fallon?
La Quinta Inn & Suites by Wyndham O'Fallon, IL - St. Louis is a top hotel for people traveling with their pets, and offers an indoor pool and a fitness center for its human guests. Two other good options for you and your pet include Super 8 by Wyndham O'Fallon and Drury Inn & Suites St. Louis O'Fallon, IL. See more pet-friendly hotel accommodations in O'Fallon.
Where is the best hotel to stay near O'Fallon Family Sports Park?
Baymont by Wyndham O'Fallon St. Louis Area is one of the top choices for your stay based on our traveler data, and this hotel offers free breakfast and free parking. It's located just a short 1 mi (1.6 km) from O'Fallon Family Sports Park. Other good options close by include Sleep Inn and Regency Inn & Suites.
What are some accommodations with pools in O'Fallon?
Fairfield Inn & Suites by Marriott O'Fallon, IL is a top hotel with an indoor pool, free buffet breakfast, and free WiFi. Other choices with an onsite pool include Comfort Inn & Suites O'Fallon - St. Louis Area and Hilton Garden Inn St. Louis Shiloh/O'Fallon IL. View all hotels with pools in O'Fallon.
What is the best hotel near Lambert-St. Louis International Airport (STL)?
Marriott St. Louis Airport is a popular 3.5-star hotel featuring a restaurant and an outdoor pool. It's located a short 0.3 mi (0.5 km) from Lambert-St. Louis Intl. Airport. Other good choices within close proximity to the airport include Pear Tree Inn Airport - St. Louis - St. Ann, MO and Drury Inn & Suites St. Louis Airport.
How is it staying in O'Fallon?
Families will find kid-friendly activities in O'Fallon, and visitors give high marks for the shopping and top-notch restaurants. This welcoming city also attracts tourists with its sporting events. Top sights around the area include Gateway Arch, Busch Stadium, and St. Louis Union Station. In O'Fallon, there are 17 hotels and other accommodations to choose from. Find out more about O'Fallon.
What should I see while I'm in O'Fallon?
Favorite places to visit include O'Fallon Family Sports Park, St. Clair Bowl, and Scott Air Force Base. You'll also find Gateway Arch and Busch Stadium in the area. Check out what more to see and do in Expedia's O'Fallon guide.
What's the weather like in O'Fallon?
The hottest months are usually July and August with an average temp of 75°F, while the coldest months are January and February with an average of 38°F. Average annual precipitation for O'Fallon is 49 inches.

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