Taking into account the local weather in Mo-I-Rana can help you maximize your time at the pool during your trip. 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.