Other facts from our historical weather data: Which is the warmest month in Sutton on Sea? 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 Sutton on Sea? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Sutton on Sea? October tops the wettest month list with 79mm (3.1 in) of rainfall. Which is the driest month in Sutton on Sea? April is the driest month with 52mm (2 in) of precipitation. Which is the sunniest month in Sutton on Sea? 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.