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: 3:56 am AST Jan 21, 2021

Hazardous Weather Outlook
Overnight

Overnight: Isolated showers.  Partly cloudy, with a low around 72. South southeast wind around 6 mph.  Chance of precipitation is 10%.
Isolated
Showers
Lo 72 °F
Thursday

Thursday: Isolated showers.  Mostly sunny, with a high near 85. Southeast wind 5 to 10 mph becoming east northeast in the afternoon.  Chance of precipitation is 20%.
Isolated
Showers
Hi 85 °F
Thursday
Night
Thursday Night: Isolated showers.  Partly cloudy, with a low around 72. East wind 5 to 9 mph becoming south after midnight.  Chance of precipitation is 20%.
Isolated
Showers
Lo 72 °F
Friday

Friday: Isolated showers.  Mostly sunny, with a high near 85. Light and variable wind becoming east northeast 5 to 10 mph in the morning.  Chance of precipitation is 20%.
Isolated
Showers
Hi 85 °F
Friday
Night
Friday Night: Isolated showers.  Partly cloudy, with a low around 71. East southeast wind around 8 mph.  Chance of precipitation is 20%.
Isolated
Showers
Lo 71 °F
Saturday

Saturday: Isolated showers.  Mostly sunny, with a high near 84. East southeast wind 6 to 9 mph.  Chance of precipitation is 20%.
Isolated
Showers
Hi 84 °F
Saturday
Night
Saturday Night: Partly cloudy, with a low around 73. East northeast wind around 8 mph.
Partly Cloudy
Lo 73 °F
Sunday

Sunday: Mostly sunny, with a high near 84. Northeast wind 6 to 10 mph.
Mostly Sunny
Hi 84 °F
Sunday
Night
Sunday Night: Partly cloudy, with a low around 71. Northeast wind around 9 mph.
Partly Cloudy
Lo 71 °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 210840
RWSPR
PRZ001>013-212045-

Weather Summary for Puerto Rico
National Weather Service San Juan PR
440 AM AST Thu Jan 21 2021

Fair weather and mostly clear skies prevailed across Puerto Rico,
Vieques and Culebra during the overnight hours as drier air moved
in. The overnight low temperatures were in the upper 60s to low
70s across the lower elevations, while the higher elevations
observed temperatures from the upper 50s to the mid 60s.

For today, a slight chance of showers is forecast for eastern
Puerto Rico in the morning, but scattered to locally numerous
showers are forecast for the interior and the southwestern
quadrant of Puerto Rico in the afternoon. That said, the amount of
rain forecast is not expected to be enough to cause flooding. The
daytime temperatures will be in the low to mid 80s across the
lower elevations, while the higher elevations will observe
temperatures in the mid 70s to low 80s.

Across the regional waters, choppy seas of up to 6 feet are
expected through this morning. Seas up to 5 feet and winds
between 5 to 15 knots are expected starting this afternoon. There
is a moderate risk of rip currents across the east, north and
southeast beaches of Puerto Rico, including Culebra and Vieques.

$$

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

Global Sea Surface Temperatures Anomalies