You'll likely spend much of your trip indoors, but if you want to see more of the area, looking at local weather trends is a good idea. The hottest months are usually May and April 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 Calatagan are July, August, September, and June, with each month seeing an average of 19 inches of rainfall.