Other facts from our historical weather data: When is winter in Härnösand? The coldest season / winter is in the following months: January, February, March and December. Which is the warmest month in Härnösand? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Härnösand? The coldest month is February with an average maximum temperature of -0°C (32°F). Which is the wettest month in Härnösand? October tops the wettest month list with 79mm (3.1 in) of rainfall. Which is the driest month in Härnösand? March is the driest month with 42mm (1.7 in) of precipitation. Which is the sunniest month in Härnösand? June is the sunniest month with an average of 288 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.