Other facts from our historical weather data: Which months have the greatest rainfall in Falmouth? Most rainfall (rainy season) is seen in May, September and October. Which is the hottest month in Falmouth? July has an average maximum temperature of 32°C (90°F) and is the hottest month of the year. Which is the coolest month in Falmouth? The coolest month is February with an average maximum temperature of 28°C (82°F). Which is the wettest month in Falmouth? May tops the wettest month list with 189mm (7.4 in) of rainfall. Which is the driest month in Falmouth? February is the driest month with 52mm (2 in) of precipitation. Which is the sunniest month in Falmouth? April is the sunniest month with an average of 253 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.