If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in Haugesund: The hottest months are usually August and July with an average temp of 57°F, while the coldest months are February and January with an average of 39°F. The rainiest months in Haugesund are October, December, September, and November, with each month seeing an average of 10 inches of rainfall.