Planning for the weather is a good way to make your trip to Mosjoen relaxing and enjoyable, especially when you're splurging. 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 20°F. The rainiest months in Mosjoen are March, September, January, and December, with each month seeing an average of 8 inches of rainfall.