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 >

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)
3:50 am AST May 16, 2025
4am AST May 16, 2025-6pm AST May 22, 2025
 
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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