Other facts from our historical weather data: Which is the warmest month in Clonmel? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Clonmel? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Clonmel? October tops the wettest month list with 94mm (3.7 in) of rainfall. Which is the driest month in Clonmel? March is the driest month with 70mm (2.8 in) of precipitation. Which is the sunniest month in Clonmel? May is the sunniest month with an average of 182 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.