Weather in August
is the hottest month of the year in Puerto Rico
, with average temperatures in the 79°F (26.1°C) to 89°F (31.7°C) range. The wet month brings an average of 5.5" (140mm) of rain in the islands and experiences the highest incidences of thunderstorms and hurricanes in the year. Ponce in the south and Isla Mona in the west are relatively drier than the north and east.
Seawater temperatures are the highest of the year in the vicinity of 84°F (28.9°C), but August finds fewer takers for water activities. The sunshine is intense and lasts for a daily 9 hours, even with an almost daily probability of rain. Expect heavy afternoon showers that last for short durations. Shop at the Calle del Cristo when the showers make it challenging to be outdoors.
Sun hats and umbrellas are mandatory in August in Puerto Rico at the peak of the hot and wet season.