Other facts from our historical weather data: Which is the warmest month in Wigtown? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Wigtown? The coldest month is February with an average maximum temperature of 8°C (46°F). Which is the wettest month in Wigtown? October tops the wettest month list with 151mm (5.9 in) of rainfall. Which is the driest month in Wigtown? May is the driest month with 82mm (3.2 in) of precipitation. 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.