Weather is probably a major factor when you plan your trip to Santubong, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and August with an average temp of 78°F, while the coldest months are January and February with an average of 76°F. The rainiest months in Santubong are December, January, February, and November, with each month seeing an average of 16 inches of rainfall.