Other facts from our historical weather data: Which months have the greatest rainfall in Nakhon Sawan? Most rainfall (rainy season) is seen in May, June, July, August, September and October. Does Nakhon Sawan have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Nakhon Sawan? April has an average maximum temperature of 39°C (102°F) and is the hottest month of the year. Which is the coolest month in Nakhon Sawan? The coolest month is December with an average maximum temperature of 33°C (91°F). Which is the wettest month in Nakhon Sawan? September tops the wettest month list with 288mm (11.3 in) of rainfall. Which is the driest month in Nakhon Sawan? December is the driest month with 10mm (0.4 in) of precipitation. Which is the sunniest month in Nakhon Sawan? March is the sunniest month with an average of 277 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.