The province has two types of climate. The first, which occurs in the northern and southern extremities and the entire western coast, has two distinct seasons – six months dry and six months wet. The other, which prevails in the eastern coast, has a short dry season of one to three months and no pronounced rainy period during the rest of the year. The southern part of the province is virtually free from tropical depressions but northern Palawan experiences torrential rains during the months of July and August. Summer months serve as peak season for Palawan. Sea voyages are most favorable from March to early June when the seas are calm. The average maximum temperature is 31 °C (88 °F) with little variation all year.
The island ecosystem of Palawan is threatened by climate change. For example, though mangroves and barrier reefs protect Puerto Princesa’s coastlines from supertyphoons, these barriers are subject to degradation due to El Niño, rising sea temperatures, and other climate change-related phenomena. A study by the World Wide Fund for Nature revealed that a spike in ocean acidification in 2010 came from Palawan’s waters.