Other facts from our historical weather data: When is the rainy season in Stung Treng? Rainy season in Stung Treng occurs in the months of May, June, July, August, September and October. Does Stung Treng have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Stung Treng? March has an average maximum temperature of 37°C (99°F) and is the hottest month of the year. Which is the coolest month in Stung Treng? The coolest month is January with an average maximum temperature of 32°C (90°F). Which is the wettest month in Stung Treng? September tops the wettest month list with 342mm (13.5 in) of rainfall. Which is the driest month in Stung Treng? January is the driest month with 6mm (0.2 in) of precipitation. Which is the sunniest month in Stung Treng? March is the sunniest month with an average of 267 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.