Surrounded by sea, but shielded from the strongest effects of tropical cyclones that often hit other parts of the Philippines by the surrounding Islands of Cebu, Mindanao, Samar and Leyte, Bohol has a very nice, tropical climate without much variations.
The nicest period to stay in Bohol is from November to February, when the climate is slightly cooler, while during the "Summer", which lasts March to May, the climate is slightly hotter than normal. Bohol does not have a very clear-cut dry season. It can rain any day of the year, but you wil have more chance for a heavy shower from November to January. If you want to see the Chocolate Hills in their "Chocolate" color, you will have to go their during the "Summer".
Current wheather report from the Philippine Government