Weather will likely play an important role when you plan your trip to Tandag, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and June with an average temp of 81°F, while the coldest months are February and March with an average of 78°F. The rainiest months in Tandag are January, December, February, and November, with each month seeing an average of 18 inches of rainfall.