Graphical Hazardous Weather Outlook


Lightning THREAT





AWCA82 TJSJ 280800

Weather Summary for Puerto Rico
National Weather Service San Juan PR
400 AM AST Sun May 28 2023

A moist plume streaming across the region caused increased cloud
cover and brought showers with isolated thunderstorms to eastern
and southern sections of Puerto Rico. Through 4 AM AST, radar-
estimated rainfall accumulations have peaked between two to three
inches in Guayama and neighboring municipalities. Elsewhere, fair
weather conditions under partly cloudy skies prevailed. Overnight
minimum temperatures range from around 66 degrees across the
higher elevations to about 79 degrees across the lower elevations
of northeastern Puerto Rico. Winds were generally calm to light
from the east-southeast but variable further inland.

As the moist plume continues to stream across the region, showers
with isolated thunderstorms will continue to affect the eastern
and southern sections of the island this morning. As the day
progresses, the shower and thunderstorm activity will shift to
land areas, aided by local effects and diurnal heating, clustering
along the northwestern quadrant of the island. Moderate to
locally heavy rains could result in flooding impacts, including
localized flash flooding. Elsewhere, showers are still possible
but with lower rainfall totals and potential risks, mainly
downwind from El Yunque and the local islands. Daytime maximum
temperatures will peak into the lower 90s across lower elevations
and other urban areas, with heat indices likely exceeding 102
degrees. Winds will become more east-southeasterly at 10-15 mph
with higher gusts and sea breeze variations.

Across the local waters, mariners can expect seas up to 5 feet and
east-to-southeast winds up to 15 knots. For beachgoers, life-
threatening rip currents are possible across northern and eastern
Puerto Rico and Culebra beaches.


The last Weather Summary for the Puerto Rico will be issued on
Wednesday, May 31, 2023. To stay updated on the weather in Puerto
Rico, please check the Areal Forecast Discussion (AFDSJU) and the
Hazardous Weather Outlook (HWOSJU).

NWS SJU Office Area Forecast Discussion



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