Weather is probably a major factor when you plan your trip to Ixtapan de la Sal, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May, with an average temperature of 22°C, while the coldest months are January and December, with an average of 19°C. The rainiest months in Ixtapan de la Sal are September, June, August and July, with each month seeing an average of 310 mm of rainfall.