If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Ullensvang: 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 Ullensvang are December, October, January, and September, with each month seeing an average of 12 inches of rainfall.