Other facts from our historical weather data: Which is the warmest month in Nordre Heggdal? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Nordre Heggdal? The coldest month is February with an average maximum temperature of 4°C (39°F). Which is the wettest month in Nordre Heggdal? September tops the wettest month list with 199mm (7.8 in) of rainfall. Which is the driest month in Nordre Heggdal? May is the driest month with 104mm (4.1 in) of precipitation. Which is the sunniest month in Nordre Heggdal? May is the sunniest month with an average of 180 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.