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National Weather Service Today's Weather Impact Levels

 

National Weather Service Forecast for: San Juan, Puerto Rico  

Updated: 3:55 am AST Aug 15, 2022

Heat Advisory
Hazardous Weather Outlook
Today

Today: Scattered showers before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then scattered showers and thunderstorms after 1pm.  Partly sunny, with a high near 91. Heat index values as high as 105. Light south southeast wind becoming southeast 8 to 13 mph in the morning.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely
Hi 91 °F
Tonight

Tonight: Scattered showers, mainly after 10pm.  Partly cloudy, with a low around 78. South southeast wind 5 to 7 mph.  Chance of precipitation is 30%.
Scattered
Showers
Lo 78 °F
Tuesday

Tuesday: Scattered showers, mainly after 1pm.  Mostly sunny, with a high near 92. Heat index values as high as 106. East wind 5 to 14 mph.  Chance of precipitation is 40%.
Scattered
Showers
Hi 92 °F
Tuesday
Night
Tuesday Night: Scattered showers, mainly before 7pm.  Widespread haze. Mostly clear, with a low around 79. East southeast wind 6 to 9 mph.  Chance of precipitation is 30%.
Scattered
Showers
Lo 79 °F
Wednesday

Wednesday: Scattered showers, mainly after 1pm.  Widespread haze before 1pm. Mostly sunny, with a high near 89. East northeast wind 5 to 14 mph.  Chance of precipitation is 30%.
Scattered
Showers
Hi 89 °F
Wednesday
Night
Wednesday Night: Scattered showers, mainly before 7pm.  Widespread haze after 7pm. Mostly clear, with a low around 79. East wind 7 to 10 mph.  Chance of precipitation is 30%.
Scattered
Showers
Lo 79 °F
Thursday

Thursday: Scattered showers, mainly before 1pm.  Partly sunny, with a high near 88. East wind 9 to 15 mph.  Chance of precipitation is 50%.
Scattered
Showers
Hi 88 °F
Thursday
Night
Thursday Night: Scattered showers, mainly after 7pm.  Mostly cloudy, with a low around 79. East wind around 10 mph.  Chance of precipitation is 50%.
Scattered
Showers
Lo 79 °F
Friday

Friday: Scattered showers.  Partly sunny, with a high near 89. East wind 9 to 16 mph, with gusts as high as 21 mph.  Chance of precipitation is 40%.
Scattered
Showers
Hi 89 °F

National Weather Service Forecast Details

 

GRLevel3 Radar

  [10/10
GRLevel3 radar from NWS station TJUA

Day 1 rainfall

Day 2 rainfall

Day 3 rainfall

000
AWCA82 TJSJ 150913 CCA
RWSPR
PRZ001>013-152200-

Weather Summary for Puerto Rico
National Weather Service San Juan PR
440 AM AST Mon Aug 15 2022

A tropical wave, the axis of which is now over eastern Puerto Rico,
brought brief passing showers to the local waters and eastern Puerto
Rico from time to time. Rain amounts over land since midnight were
generally less than fifteen hundredths of an inch. Winds were light
and less than 7 mph in land breezes. Overnight low temperatures
ranged from the mid 60s in the highest mountain valleys to the upper
70s on the windward coasts. Overnight lows were in the lower 80s on
Culebra. As of 4:30 AM AST no lighting was observed in the forecast
area.

Better moisture is behind the wave and will spread across the
islands during the day. Showers will become more frequent across
eastern Puerto Rico during the morning hours then showers and
thunderstorms will pass through the entire island and grow stronger
in western Puerto Rico. Rainfall amounts of up to 2 inches in the
heavier showers and thunderstorms are possible, with isolated spots
of 4 inches possible. Winds will become south east to south with
some sea breeze influences and up to 15 mph with stronger gusts in
sea breezes and near thunderstorms. Due to higher relative
humidities we expect hot weather again today. A heat advisory has
been put into place from 10 AM to 4 PM AST today for most of the
lower elevations of Puerto Rico for heat indices of 102 to 111
degrees, with the highest heat indices on the north coast and just
inland. Actual high temperatures will vary from the lower 90s in the
lower elevations to the upper 70s in the highest mountains. A drying
trend will begin tonight, but excessive heat will continue through
the week.

Except for locally hazardous marine conditions generated by the
shower and thunderstorm activity across the local waters, seas will
remain less than 4 feet and winds generally less than 15 knots. Most
north, east and southeast-facing beaches have a moderate risk of rip
currents.

$$

This product is issued around 5 AM and 5 PM each day and weather
conditions may change between issuances. Please verify the status
of any Watches...Warnings or Advisories mentioned in this product.

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