Other facts from our historical weather data: Which is the warmest month in Withernsea? August has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Withernsea? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Withernsea? November tops the wettest month list with 82mm (3.2 in) of rainfall. Which is the driest month in Withernsea? April is the driest month with 54mm (2.1 in) of precipitation. Which is the sunniest month in Withernsea? May is the sunniest month with an average of 202 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.