Weather will likely play an important role when you plan your trip to Bayombong, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually June and May with an average temp of 77°F, while the coldest months are January and February with an average of 67°F. The rainiest months in Bayombong are October, July, December, and September, with each month seeing an average of 14 inches of rainfall.