Other facts from our historical weather data: Which months have the greatest rainfall in Sisophon ? Most rainfall (rainy season) is seen in May, July, August, September and October. Does Sisophon have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Sisophon ? April has an average maximum temperature of 38°C (100°F) and is the hottest month of the year. Which is the coolest month in Sisophon ? The coolest month is December with an average maximum temperature of 33°C (91°F). Which is the wettest month in Sisophon ? September tops the wettest month list with 256mm (10.1 in) of rainfall. Which is the driest month in Sisophon ? December is the driest month with 11mm (0.4 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.