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 temperature of 11°C, while the coldest months are January and February, with an average of -7°C. The rainiest months in Mosjoen are March, September, January and December, with each month seeing an average of 197 mm of rainfall.