Other facts from our historical weather data: When is winter in Senja? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Senja? July has an average maximum temperature of 16°C (61°F) and is the warmest month of the year. Which is the coldest month in Senja? The coldest month is February with an average maximum temperature of -0°C (32°F). Which is the wettest month in Senja? October tops the wettest month list with 141mm (5.6 in) of rainfall. Which is the driest month in Senja? May is the driest month with 83mm (3.3 in) of precipitation. Which is the sunniest month in Senja? May is the sunniest month with an average of 219 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.