Planning for the weather is a good way to make your trip to Calatagan relaxing and enjoyable, especially when you're splurging. 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.