If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Suldal: The hottest months are usually July and August with an average temp of 54°F, while the coldest months are February and January with an average of 29°F. The rainiest months in Suldal are December, October, January, and September, with each month seeing an average of 11 inches of rainfall.