Weather is probably a major factor when you plan your trip to Mon, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and June, with an average temperature of 28°C, while the coldest months are January and December, with an average of 19°C. The rainiest months in Mon are July, June, August and September, with each month seeing an average of 565 mm of rainfall.