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National Weather Service Today's Weather Impact Levels

National Weather Service Five Day Forecast for: San Juan, Puerto Rico  

Updated: 5:04 am AST Sep 21, 2018 

Hazardous Weather Outlook
 

Overnight

Overnight: Scattered showers.  Mostly clear, with a low around 77. East southeast wind around 8 mph.  Chance of precipitation is 30%.
Scattered
Showers
Friday

Friday: Isolated showers.  Widespread haze. Sunny, with a high near 89. East northeast wind 13 to 16 mph.  Chance of precipitation is 20%.
Isolated
Showers
Friday
Night
Friday Night: Scattered showers.  Partly cloudy, with a low around 77. East wind 9 to 13 mph.  Chance of precipitation is 40%.
Scattered
Showers
Saturday

Saturday: Scattered showers, mainly before noon.  Mostly sunny, with a high near 90. Heat index values as high as 102. East northeast wind 10 to 15 mph.  Chance of precipitation is 40%.
Scattered
Showers
Saturday
Night
Saturday Night: Scattered showers.  Partly cloudy, with a low around 78. East wind 9 to 11 mph.  Chance of precipitation is 40%.
Scattered
Showers
Sunday

Sunday: Scattered showers, with thunderstorms also possible after noon.  Mostly sunny, with a high near 89. East wind 10 to 17 mph.  Chance of precipitation is 40%.
Scattered
Showers
Sunday
Night
Sunday Night: Partly cloudy, with a low around 77. East southeast wind around 11 mph.
Partly Cloudy

Monday

Monday: Scattered showers, mainly before noon.  Mostly sunny, with a high near 89. East wind 13 to 18 mph.  Chance of precipitation is 40%.
Scattered
Showers then
Mostly Sunny
Monday
Night
Monday Night: Partly cloudy, with a low around 77. East wind 10 to 14 mph.
Partly Cloudy

Lo 77 °FHi 89 °FLo 77 °FHi 90 °FLo 78 °FHi 89 °FLo 77 °FHi 89 °FLo 77 °F

National Weather Service Forecast Details

 

 

INVEST 99L

 

Forecasting Models

 

INVEST 97L

 

 

 

Forecasting Models

 

Caribbean Sea Satellite

 

GRLevel3 Radar

  [10/10
GRLevel3 radar from NWS station TJUA

 

NWS San Juan TJUA Doppler Radar

 

Weather Summary for Puerto Rico

000
AWCA82 TJSJ 210844
RWSPR

Weather Summary for Puerto Rico
National Weather Service San Juan PR
444 AM AST Fri Sep 21 2018

Hazy skies prevailed during the overnight and this morning with
easterly winds of 5 to 10 mph. Doppler radar showed light showers
over the land areas but accumulations were light. The heaviest
showers remained over the local and outer waters. Overnight low
temperatures were in the middle 70s to lower 80s in lower
elevations, and the upper 60s to lower 70s in higher elevations.
Winds were out of the east at 5 to 10 mph.

The Saharan dust will prevail across the area today, therefore,
expect hazy milky skies. The dust is expected to peak tomorrow and
should diminish over the next several days. Todays high
temperatures will be near the upper 80s to lower 90s in lower
elevations, and the upper 70s to lower 80s in higher elevations.

The drier airmass and mid to upper level ridge will limited
shower activity across the area today, this is a result of
limited moisture and subsidence provided by the high pressures.
Although theirs limiting factors for rainfall an isolated shower
is possible during the afternoon hours, but they will be short-
lived if they develop.

Seas will range between 4 and 5 feet with east to northeast
winds at 15 to 20 knots. Therefore, small boat operators should
exercise caution across these waters. Elsewhere seas and winds are
forecast to slowly return between 2 and 5 feet and around 15
knots, respectively.

$$

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

 

 

Tropical Weather Outlook

 

 

 

 

Satellite Imagery

alt

Select a map type to view:

 

Long-wave Infrared Imagery for Atlantic Ocean (GOES16)

Courtesy of College of Dupage

 

Global Tropics Hazards and Benefits Outlook (Click image for more details)

 

Saharan Air Layer

 

Wind Shear Tendency

 

Sea Surface Temperatures

 

Sea Surface Temperatures Anomalies

 

MJO Forecast

 

 


 


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