Weather will likely play an important role when you plan your trip to General Santos, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April with an average temp of 80°F, while the coldest months are July and August with an average of 79°F. The rainiest months in General Santos are June, May, July, and November, with each month seeing an average of 13 inches of rainfall.