Weather is probably a major factor when you plan your trip to San Mateo Río Hondo, 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 26°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in San Mateo Río Hondo are September, June, August and October, with each month seeing an average of 505 mm of rainfall.