Other facts from our historical weather data: Which is the warmest month in Keitum? August has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Keitum? The coldest month is February with an average maximum temperature of 5°C (41°F). Which is the wettest month in Keitum? October tops the wettest month list with 115mm (4.5 in) of rainfall. Which is the driest month in Keitum? April is the driest month with 46mm (1.8 in) of precipitation. Which is the sunniest month in Keitum? June is the sunniest month with an average of 266 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.