Other facts from our historical weather data: Which is the warmest month in Laggan? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Laggan? The coldest month is February with an average maximum temperature of 5°C (41°F). Which is the wettest month in Laggan? January tops the wettest month list with 146mm (5.7 in) of rainfall. Which is the driest month in Laggan? April is the driest month with 90mm (3.5 in) of precipitation. Which is the sunniest month in Laggan? May is the sunniest month with an average of 178 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.