Other facts from our historical weather data: Which is the warmest month in Inchmill? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Inchmill? The coldest month is February with an average maximum temperature of 6°C (43°F). Which is the wettest month in Inchmill? October tops the wettest month list with 109mm (4.3 in) of rainfall. Which is the driest month in Inchmill? April is the driest month with 79mm (3.1 in) of precipitation. Which is the sunniest month in Inchmill? May is the sunniest month with an average of 193 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.