If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Mo-I-Rana: The hottest months are usually July and August, with an average temperature of 11°C, while the coldest months are January and February, with an average of -6°C. The rainiest months in Mo-I-Rana are March, January, September and December, with each month seeing an average of 203 mm of rainfall.