Other facts from our historical weather data: Which is the warmest month in Haparanda? 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 Haparanda? The coldest month is February with an average maximum temperature of -5°C (23°F). Which is the wettest month in Haparanda? August tops the wettest month list with 75mm (3 in) of rainfall. Which is the driest month in Haparanda? April is the driest month with 39mm (1.5 in) of precipitation. 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.