Weather is probably a major factor when you plan your trip to San Miguel, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April with an average temp of 84°F, while the coldest months are December and January with an average of 80°F. The rainiest months in San Miguel are October, June, September, and August, with each month seeing an average of 13 inches of rainfall.