Other facts from our historical weather data: Which is the warmest month in Kalix? 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 Kalix? The coldest month is February with an average maximum temperature of -5°C (23°F). Which is the wettest month in Kalix? July tops the wettest month list with 73mm (2.9 in) of rainfall. Which is the driest month in Kalix? April is the driest month with 38mm (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.