Weather is probably a major factor when you plan your trip to Sanom, 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 30°C, while the coldest months are January and December, with an average of 25°C. The rainiest months in Sanom are September, July, August and October, with each month seeing an average of 261 mm of rainfall.