If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Sakon Nakhon: The hottest months are usually April and March, with an average temperature of 29°C, while the coldest months are January and December, with an average of 23°C. The rainiest months in Sakon Nakhon are August, July, September and May, with each month seeing an average of 364 mm of rainfall.