Weather is probably a major factor when you plan your trip to San Isidro de El General, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and February with an average temp of 69°F, while the coldest months are January and February with an average of 68°F. The rainiest months in San Isidro de El General are October, August, November, and July, with each month seeing an average of 41 inches of rainfall.