Other facts from our historical weather data: Which months have the greatest rainfall in Phan Thong? Most rainfall (rainy season) is seen in May, June, July, August, September and October. Which is the hottest month in Phan Thong? April has an average maximum temperature of 36°C (97°F) and is the hottest month of the year. Which is the coolest month in Phan Thong? The coolest month is December with an average maximum temperature of 33°C (91°F). Which is the wettest month in Phan Thong? September tops the wettest month list with 284mm (11.2 in) of rainfall. Which is the driest month in Phan Thong? December is the driest month with 11mm (0.4 in) of precipitation. Which is the sunniest month in Phan Thong? March is the sunniest month with an average of 249 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.