Weather is probably a major factor when you plan your trip to San Miguel, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and January, with an average temperature of 25°C, while the coldest months are July and August, with an average of 23°C. The rainiest months in San Miguel are April, May, March and June, with each month seeing an average of 593 mm of rainfall.