National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Sunday Brings Heat Relief For Some; Flash Flood Threat Along Cold Front

A cold front shifting across the Central Plains, Midwest, Great Lakes and Northeast on Sunday will bring some relief from the heat with cooler and drier air. Excessive heat holds Sunday roughly south of I-70. Heavy rain from thunderstorms along the front may bring flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

San Juan, Luis Munoz Marin International Airport (TJSJ)

Lat: 18.45°NLon: 66°WElev: 10ft.

A Few Clouds

81°F

27°C

Humidity 74%
Wind Speed Vrbl 5 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 21 Jul 1:56 am AST
Extended Forecast for

San Juan PR

  • Overnight

    Overnight: Isolated showers. Partly cloudy, with a low around 78. Southeast wind around 8 mph. Chance of precipitation is 20%.

    Isolated
    Showers

    Low: 78 °F

  • Sunday

    Sunday: Isolated showers, then scattered showers and thunderstorms after noon. Mostly sunny, with a high near 89. East wind 9 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

    Isolated
    Showers then
    Scattered
    Showers

    High: 89 °F

  • Sunday
    Night

    Sunday Night: Scattered showers, mainly after midnight. Partly cloudy, with a low around 78. East wind around 10 mph. Chance of precipitation is 30%.

    Scattered
    Showers

    Low: 78 °F

  • Monday

    Monday: Scattered showers, mainly after noon. Mostly sunny, with a high near 90. East wind 13 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.

    Scattered
    Showers

    High: 90 °F

  • Monday
    Night

    Monday Night: Scattered showers. Mostly cloudy, with a low around 79. East southeast wind 10 to 13 mph. Chance of precipitation is 30%.

    Scattered
    Showers

    Low: 79 °F

  • Tuesday

    Tuesday: Scattered showers. Mostly sunny, with a high near 91. East wind 14 to 18 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    Scattered
    Showers

    High: 91 °F

  • Tuesday
    Night

    Tuesday Night: Mostly clear, with a low around 78. East wind 11 to 14 mph.

    Mostly Clear

    Low: 78 °F

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91. East wind 13 to 15 mph, with gusts as high as 20 mph.

    Mostly Sunny

    High: 91 °F

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 78. East wind around 11 mph.

    Partly Cloudy

    Low: 78 °F

Detailed Forecast

Overnight
Isolated showers. Partly cloudy, with a low around 78. Southeast wind around 8 mph. Chance of precipitation is 20%.
Sunday
Isolated showers, then scattered showers and thunderstorms after noon. Mostly sunny, with a high near 89. East wind 9 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Scattered showers, mainly after midnight. Partly cloudy, with a low around 78. East wind around 10 mph. Chance of precipitation is 30%.
Monday
Scattered showers, mainly after noon. Mostly sunny, with a high near 90. East wind 13 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Monday Night
Scattered showers. Mostly cloudy, with a low around 79. East southeast wind 10 to 13 mph. Chance of precipitation is 30%.
Tuesday
Scattered showers. Mostly sunny, with a high near 91. East wind 14 to 18 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Tuesday Night
Mostly clear, with a low around 78. East wind 11 to 14 mph.
Wednesday
Mostly sunny, with a high near 91. East wind 13 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 78. East wind around 11 mph.
Thursday
Scattered showers. Mostly sunny, with a high near 89. Chance of precipitation is 50%.
Thursday Night
Scattered showers. Partly cloudy, with a low around 78. Chance of precipitation is 40%.
Friday
Scattered showers. Mostly sunny, with a high near 91. Chance of precipitation is 40%.
Friday Night
Scattered showers. Partly cloudy, with a low around 79. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 91.
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
San Juan PR
 18.41°N 66.08°W (Elev. 16 ft)
Last Update:
7:50 pm AST Jul 20, 2019
Forecast Valid:
2am AST Jul 21, 2019-6pm AST Jul 27, 2019
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation