Weather will likely play an important role when you plan your trip to Bayambang, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May with an average temp of 83°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Bayambang are July, August, September, and June, with each month seeing an average of 15 inches of rainfall.