Weather will likely play an important role when you plan your trip to Sayaboury, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March, with an average temperature of 26°C, while the coldest months are January and December, with an average of 20°C. The rainiest months in Sayaboury are August, July, September and June, with each month seeing an average of 369 mm of rainfall.