You'll likely spend much of your trip indoors, but if you want to see more of the area, taking a look at local weather data can help you. The hottest months are usually May and June with an average temp of 83°F, while the coldest months are February and January with an average of 80°F. The rainiest months in San Isidro are January, December, November, and February, with each month seeing an average of 13 inches of rainfall.