If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Walchsee: The hottest months are usually July and August with an average temp of 60°F, while the coldest months are January and February with an average of 32°F. The rainiest months in Walchsee are May, June, July, and August, with each month seeing an average of 9 inches of rainfall.