Other facts from our historical weather data: Which is the warmest month in Bushmills? August has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Bushmills? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Bushmills? November tops the wettest month list with 151mm (5.9 in) of rainfall. Which is the driest month in Bushmills? May is the driest month with 75mm (3 in) of precipitation. Which is the sunniest month in Bushmills? May is the sunniest month with an average of 203 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.