Planning for the weather is an important factor for making your trip to Vefsn a success, 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 Vefsn are March, September, January and December, with each month seeing an average of 197 mm of rainfall.