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Hazardous Weather Conditions

Current conditions at

San Juan, Luis Munoz Marin International Airport (TJSJ)

Lat: 18.45°NLon: 66°WElev: 10ft.

Partly Cloudy

84°F

29°C

Humidity 70%
Wind Speed E 3 mph
Barometer 30.03 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 4 Oct 8:56 am AST
Extended Forecast for

Guaynabo PR

Heat Advisory October 4, 10:00am until October 4, 04:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Scattered showers, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 91. Heat index values as high as 105. East wind 6 to 13 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 91 °F

    Isolated
    Showers then
    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely before midnight, then scattered showers. Mostly cloudy, with a low around 77. Southeast wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 77 °F

    Showers
    Likely

  • Monday

    Monday: Scattered showers, mainly between 9am and 3pm. Mostly sunny, with a high near 92. Heat index values as high as 107. East wind 5 to 14 mph. Chance of precipitation is 30%.

    High: 92 °F

    Scattered
    Showers

  • Monday Night

    Monday Night: Isolated showers before midnight. Mostly clear, with a low around 78. East southeast wind 5 to 7 mph. Chance of precipitation is 10%.

    Low: 78 °F

    Isolated
    Showers then
    Mostly Clear

  • Tuesday

    Tuesday: Scattered showers after noon. Mostly sunny, with a high near 91. East northeast wind 5 to 13 mph. Chance of precipitation is 30%.

    High: 91 °F

    Sunny then
    Scattered
    Showers

  • Tuesday Night

    Tuesday Night: Scattered showers, mainly before midnight. Partly cloudy, with a low around 79. East wind 3 to 7 mph. Chance of precipitation is 30%.

    Low: 79 °F

    Scattered
    Showers

  • Wednesday

    Wednesday: Scattered showers, mainly after noon. Partly sunny, with a high near 87. East northeast wind 6 to 14 mph. Chance of precipitation is 50%.

    High: 87 °F

    Mostly Sunny
    then
    Scattered
    Showers

  • Wednesday Night

    Wednesday Night: Scattered showers. Mostly cloudy, with a low around 78. South southeast wind around 7 mph. Chance of precipitation is 40%.

    Low: 78 °F

    Scattered
    Showers

  • Thursday

    Thursday: Scattered showers. Partly sunny, with a high near 91. East wind 7 to 14 mph. Chance of precipitation is 50%.

    High: 91 °F

    Scattered
    Showers

Detailed Forecast

Today
Scattered showers, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 91. Heat index values as high as 105. East wind 6 to 13 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and thunderstorms likely before midnight, then scattered showers. Mostly cloudy, with a low around 77. Southeast wind 3 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Scattered showers, mainly between 9am and 3pm. Mostly sunny, with a high near 92. Heat index values as high as 107. East wind 5 to 14 mph. Chance of precipitation is 30%.
Monday Night
Isolated showers before midnight. Mostly clear, with a low around 78. East southeast wind 5 to 7 mph. Chance of precipitation is 10%.
Tuesday
Scattered showers after noon. Mostly sunny, with a high near 91. East northeast wind 5 to 13 mph. Chance of precipitation is 30%.
Tuesday Night
Scattered showers, mainly before midnight. Partly cloudy, with a low around 79. East wind 3 to 7 mph. Chance of precipitation is 30%.
Wednesday
Scattered showers, mainly after noon. Partly sunny, with a high near 87. East northeast wind 6 to 14 mph. Chance of precipitation is 50%.
Wednesday Night
Scattered showers. Mostly cloudy, with a low around 78. South southeast wind around 7 mph. Chance of precipitation is 40%.
Thursday
Scattered showers. Partly sunny, with a high near 91. East wind 7 to 14 mph. Chance of precipitation is 50%.
Thursday Night
Scattered showers. Partly cloudy, with a low around 78. Chance of precipitation is 30%.
Friday
Scattered showers. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 77.
Saturday
Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Guaynabo PR
 18.38°N 66.11°W (Elev. 167 ft)
Last Update:
3:54 am AST Oct 4, 2026
Forecast Valid:
9am AST Oct 4, 2026-6pm AST Oct 10, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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