Weather will likely play an important role when you plan your trip to Houayxay, 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 21°C. The rainiest months in Houayxay are August, July, September and May, with each month seeing an average of 280 mm of rainfall.