Other facts from our historical weather data: Which is the warmest month in Trévou-Tréguignec? August has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Trévou-Tréguignec? The coldest month is February with an average maximum temperature of 11°C (52°F). Which is the wettest month in Trévou-Tréguignec? December tops the wettest month list with 117mm (4.6 in) of rainfall. Which is the driest month in Trévou-Tréguignec? July is the driest month with 45mm (1.8 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.