Other facts from our historical weather data: Which is the warmest month in Southwold? 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 Southwold? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Southwold? October tops the wettest month list with 84mm (3.3 in) of rainfall. Which is the driest month in Southwold? April is the driest month with 44mm (1.7 in) of precipitation. Which is the sunniest month in Southwold? May is the sunniest month with an average of 204 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.