Taking the local weather in Isulan into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually April and March, with an average temperature of 26°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Isulan are May, January, June and November, with each month seeing an average of 318 mm of rainfall.