Other facts from our historical weather data: Which is the warmest month in Kymönkoski? July has an average maximum temperature of 22°C (72°F) and is the warmest month of the year. Which is the coldest month in Kymönkoski? The coldest month is February with an average maximum temperature of -4°C (25°F). Which is the wettest month in Kymönkoski? July tops the wettest month list with 98mm (3.9 in) of rainfall. Which is the driest month in Kymönkoski? March 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.