Taking into account the local weather in Tyssedal is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually July and August with an average temp of 50°F, while the coldest months are January and February with an average of 23°F. The rainiest months in Tyssedal are December, October, January, and September, with each month seeing an average of 12 inches of rainfall.