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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

86°F

30°C

Humidity 66%
Wind Speed E 17 mph
Barometer 30.04 in
Dewpoint 73°F (23°C)
Visibility 8.00 mi
Heat Index93°F (34°C)
Last update 16 Aug 8:56 am AST
Extended Forecast for

Guaynabo PR

Heat Advisory August 16, 10:00am until August 16, 05:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Scattered showers, mainly between noon and 3pm. Widespread haze before noon, then widespread haze after 3pm. Mostly sunny, with a high near 87. East wind 14 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.

    High: 87 °F

    Isolated
    Showers then
    Scattered
    Showers

  • Tonight

    Tonight: Isolated showers between 9pm and 3am. Widespread haze before 9pm. Mostly clear, with a low around 78. East wind 7 to 10 mph. Chance of precipitation is 20%.

    Low: 78 °F

    Isolated
    Showers

  • Monday

    Monday: Isolated showers before 3pm. Sunny, with a high near 89. Heat index values as high as 102. East wind 11 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 10%.

    High: 89 °F

    Isolated
    Showers

  • Monday Night

    Monday Night: Isolated showers after midnight. Partly cloudy, with a low around 78. East wind around 8 mph. Chance of precipitation is 20%.

    Low: 78 °F

    Mostly Clear
    then Isolated
    Showers

  • Tuesday

    Tuesday: Scattered showers, mainly after noon. Mostly sunny, with a high near 90. East northeast wind 9 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    High: 90 °F

    Isolated
    Showers then
    Scattered
    Showers

  • Tuesday Night

    Tuesday Night: Clear, with a low around 77. East southeast wind around 8 mph.

    Low: 77 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 89. East wind 8 to 14 mph.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Scattered showers. Mostly cloudy, with a low around 78. Southeast wind around 7 mph. Chance of precipitation is 50%.

    Low: 78 °F

    Scattered
    Showers

  • Thursday

    Thursday: Scattered showers. Mostly sunny, with a high near 90. East wind 8 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    High: 90 °F

    Scattered
    Showers

Detailed Forecast

Today
Scattered showers, mainly between noon and 3pm. Widespread haze before noon, then widespread haze after 3pm. Mostly sunny, with a high near 87. East wind 14 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Tonight
Isolated showers between 9pm and 3am. Widespread haze before 9pm. Mostly clear, with a low around 78. East wind 7 to 10 mph. Chance of precipitation is 20%.
Monday
Isolated showers before 3pm. Sunny, with a high near 89. Heat index values as high as 102. East wind 11 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 10%.
Monday Night
Isolated showers after midnight. Partly cloudy, with a low around 78. East wind around 8 mph. Chance of precipitation is 20%.
Tuesday
Scattered showers, mainly after noon. Mostly sunny, with a high near 90. East northeast wind 9 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Tuesday Night
Clear, with a low around 77. East southeast wind around 8 mph.
Wednesday
Sunny, with a high near 89. East wind 8 to 14 mph.
Wednesday Night
Scattered showers. Mostly cloudy, with a low around 78. Southeast wind around 7 mph. Chance of precipitation is 50%.
Thursday
Scattered showers. Mostly sunny, with a high near 90. East wind 8 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Thursday Night
Partly cloudy, with a low around 78.
Friday
Sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 78.
Saturday
Scattered showers. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Guaynabo PR
 18.38°N 66.11°W (Elev. 167 ft)
Last Update:
8:37 am AST Aug 16, 2026
Forecast Valid:
9am AST Aug 16, 2026-6pm AST Aug 22, 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