Weather is probably a major factor when you plan your trip to San Ildefonso Ixtahuacán, 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 15°C, while the coldest months are January and December, with an average of 13°C. The rainiest months in San Ildefonso Ixtahuacán are June, September, August and July, with each month seeing an average of 548 mm of rainfall.