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 temperature of 28°C, while the coldest months are February and January, with an average of 27°C. The rainiest months in Calatagan are July, August, September and June, with each month seeing an average of 494 mm of rainfall.