Since 2001 providing the latest information on tropical cyclone activity in the Atlantic Basin and the weather conditions in Puerto Rico.

Local Weather Conditions

 

National Weather Service Today's Weather Impact Levels

National Weather Service Forecast for: San Juan, Puerto Rico  

Updated: 4:59 am AST Jul 24, 2021

Hazardous Weather Outlook
Today

Today: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 10am.  High near 88. East southeast wind 14 to 16 mph, with gusts as high as 21 mph.  Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Showers

Hi 88 °F
Tonight

Tonight: Showers and thunderstorms before 1am, then isolated showers between 1am and 4am, then isolated showers and thunderstorms after 4am.  Low around 78. East southeast wind 8 to 10 mph.  Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Showers then
Scattered
Showers
Lo 78 °F
Sunday

Sunday: Scattered showers and thunderstorms before 7am, then scattered showers between 7am and 1pm, then showers likely and possibly a thunderstorm after 1pm.  Increasing clouds, with a high near 89. Southeast wind 10 to 16 mph, with gusts as high as 21 mph.  Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Scattered
Showers then
Showers
Likely
Hi 89 °F
Sunday
Night
Sunday Night: Showers likely and possibly a thunderstorm before 7pm, then scattered showers.  Cloudy, then gradually becoming partly cloudy, with a low around 79. East southeast wind around 11 mph.  Chance of precipitation is 60%.
Showers
Likely

Lo 79 °F
Monday

Monday: Scattered showers, mainly before 1pm.  Mostly sunny, with a high near 90. East southeast wind 11 to 13 mph.  Chance of precipitation is 30%.
Scattered
Showers

Hi 90 °F
Monday
Night
Monday Night: Isolated showers.  Partly cloudy, with a low around 78. East wind 9 to 11 mph.  Chance of precipitation is 20%.
Isolated
Showers

Lo 78 °F
Tuesday

Tuesday: Sunny, with a high near 89. East northeast wind 11 to 14 mph.
Sunny

Hi 89 °F
Tuesday
Night
Tuesday Night: Scattered showers.  Partly cloudy, with a low around 78. East northeast wind 8 to 10 mph.  Chance of precipitation is 40%.
Scattered
Showers

Lo 78 °F
Wednesday

Wednesday: Scattered showers.  Partly sunny, with a high near 89. East wind 10 to 14 mph.  Chance of precipitation is 50%.
Scattered
Showers

Hi 89 °F

National Weather Service Forecast Details

 

GRLevel3 radar images are not available at this time.

Day 1 rainfall

Day 2 rainfall

Day 3 rainfall

000
AWCA82 TJSJ 241142 CCA
RWSPR
PRZ001>013-242015-

Weather Summary for Puerto Rico...CORRECTED
National Weather Service San Juan PR
742 AM AST Sat Jul 24 2021

During the overnight hours, partly cloudy skies were observed
across most of the region. Overnight temperatures were near the
middle to upper 70s. Winds were from the east ranging from 10 to
15 mph. GOES-16 and SJU doppler radar show showers and
thunderstorms moving across the local waters, Vieques, Culebra,
and northern and eastern Puerto Rico. The activity will continue
to increases across the areas mentioned above through the morning
hours. This activity will produce frequent lightning, and moderate
to heavy rains that could lead to urban and small stream flooding
and localized flash flooding over portions of northeast Puerto
Rico.

This afternoon, as the wave moves westward, it will interact with
an upper-level low to the northwest of Puerto Rico. The upper-
level low and tropical wave will cause favorable conditions that
will support numerous showers and thunderstorm development over
the western, interior, and northwestern areas of Puerto Rico this
afternoon. Urban and small stream flooding is likely due to the
moderate to heavy rainfall. Today`s high temperatures are forecast
to be near the middle 80s to lower 90s in lower elevations and
the middle 70 to lower 80s in higher elevations. Winds will be
from the east ranging from 10 to 20 mph with higher gusts.

For the local waters, moderate to fresh easterly winds will
prevail over the local waters through at least Sunday, causing
choppy marine conditions. Seas up to 7 feet for the outer Atlantic
waters today. Therfore, a Small Craft Advisory is in effect for
the outer Atlantic waters. Small craft should exercise caution due
to seas up to 6 feet across the Caribbean waters and Anegada Passage.

$$

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.

NWS SJU Office Area Forecast Discussion

Saharan Air Layer

Wind Shear Tendency

Sea Surface Temperatures

Sea Surface Temperatures Anomalies