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

Severe Thunderstorms, Heavy Rainfall and Dangerous Heat

Severe thunderstorms are expected today and Friday from the upper Midwest, central Great Lakes into the Ohio and mid-Mississippi Valley's. In addition, heavy rainfall threat increases on Friday across the Ohio Valley. Meanwhile, early summer-like heat wave across portions of southern Texas with new daily records are forecast today and through the weekend; The heat spreads across the Gulf States. Read More >

Hazardous Weather Conditions

Current conditions at

San Juan, Luis Munoz Marin International Airport (TJSJ)

Lat: 18.45°NLon: 66°WElev: 10ft.

Partly Cloudy

77°F

25°C

Humidity 89%
Wind Speed Calm
Barometer 29.98 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 16 May 3:56 am AST
Extended Forecast for

San Juan PR

  • Overnight

    Overnight: Scattered showers and thunderstorms. Mostly cloudy, with a low around 76. East southeast wind around 8 mph. Chance of precipitation is 50%.

    Low: 76 °F

    Scattered
    Showers

  • Friday

    Friday: Scattered showers before noon, then scattered showers and thunderstorms between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 87. East wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 87 °F

    Scattered
    Showers then
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then scattered showers and thunderstorms after 3am. Mostly cloudy, with a low around 74. East southeast wind 6 to 11 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 74 °F

    Showers
    Likely

  • Saturday

    Saturday: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 9am. High near 85. East wind 6 to 13 mph. Chance of precipitation is 80%.

    High: 85 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 70%.

    Low: 74 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 88. East wind 3 to 8 mph. Chance of precipitation is 70%.

    High: 88 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely. Mostly cloudy, with a low around 75. East southeast wind 5 to 7 mph. Chance of precipitation is 60%.

    Low: 75 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly after noon. Mostly cloudy, with a high near 88. East wind 3 to 8 mph. Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Showers likely. Mostly cloudy, with a low around 76. East southeast wind 3 to 6 mph. Chance of precipitation is 60%.

    Low: 76 °F

    Showers
    Likely

Detailed Forecast

Overnight
Scattered showers and thunderstorms. Mostly cloudy, with a low around 76. East southeast wind around 8 mph. Chance of precipitation is 50%.
Friday
Scattered showers before noon, then scattered showers and thunderstorms between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 87. East wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Friday Night
Showers and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then scattered showers and thunderstorms after 3am. Mostly cloudy, with a low around 74. East southeast wind 6 to 11 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 9am. High near 85. East wind 6 to 13 mph. Chance of precipitation is 80%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 70%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 88. East wind 3 to 8 mph. Chance of precipitation is 70%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 75. East southeast wind 5 to 7 mph. Chance of precipitation is 60%.
Monday
Showers likely, mainly after noon. Mostly cloudy, with a high near 88. East wind 3 to 8 mph. Chance of precipitation is 60%.
Monday Night
Showers likely. Mostly cloudy, with a low around 76. East southeast wind 3 to 6 mph. Chance of precipitation is 60%.
Tuesday
Scattered showers. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Tuesday Night
Scattered showers. Mostly cloudy, with a low around 76. Chance of precipitation is 30%.
Wednesday
Scattered showers. Partly sunny, with a high near 90. Chance of precipitation is 50%.
Wednesday Night
Scattered showers. Mostly cloudy, with a low around 76. Chance of precipitation is 40%.
Thursday
Scattered showers. Mostly cloudy, with a high near 90. Chance of precipitation is 50%.
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ABOUT THIS FORECAST

 
Point Forecast:
San Juan PR
 18.41°N 66.08°W (Elev. 16 ft)
Last Update:
3:50 am AST May 16, 2025
Forecast Valid:
4am AST May 16, 2025-6pm AST May 22, 2025
 
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