Weather is probably a major factor when you plan your trip to San Juan del Sur, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May, with an average temperature of 28°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in San Juan del Sur are October, September, June and August, with each month seeing an average of 279 mm of rainfall.