Other facts from our historical weather data: When is summer in Kansas City?The hottest season / summer takes place in June, July, August and September. Which is the warmest month in Kansas City? July has an average maximum temperature of 32°C (90°F) and is the warmest month of the year. Which is the coldest month in Kansas City? The coldest month is January with an average maximum temperature of 5°C (41°F). Which is the wettest month in Kansas City? May tops the wettest month list with 150mm (5.9 in) of rainfall. Which is the driest month in Kansas City? January is the driest month with 21mm (0.8 in) of precipitation. Which is the sunniest month in Kansas City? July is the sunniest month with an average of 330 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.