If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Mo-I-Rana: The hottest months are usually July and August with an average temp of 51°F, while the coldest months are January and February with an average of 21°F. The rainiest months in Mo-I-Rana are March, January, September, and December, with each month seeing an average of 8 inches of rainfall.