Weather is probably a major factor when you plan your trip to Phon, 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 29°C, while the coldest months are January and December, with an average of 24°C. The rainiest months in Phon are September, August, July and May, with each month seeing an average of 271 mm of rainfall.