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

San Juan, Luis Munoz Marin International Airport (TJSJ)

Lat: 18.45°NLon: 66°WElev: 10ft.

Partly Cloudy

82°F

28°C

Humidity 79%
Wind Speed SE 6 mph
Barometer 30.03 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 22 Aug 12:56 am AST
Extended Forecast for

San Antonio PR

  • Overnight

    Overnight: Isolated showers. Partly cloudy, with a low around 78. East southeast wind 9 to 11 mph. Chance of precipitation is 20%.

    Low: 78 °F

    Isolated
    Showers

  • Saturday

    Saturday: Scattered showers, mainly after 3pm. Mostly sunny, with a high near 91. Heat index values as high as 110. East northeast wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Chance of precipitation is 30%.

    High: 91 °F

    Scattered
    Showers

  • Saturday Night

    Saturday Night: Isolated showers. Partly cloudy, with a low around 78. East southeast wind 8 to 11 mph. Chance of precipitation is 20%.

    Low: 78 °F

    Isolated
    Showers

  • Sunday

    Sunday: Scattered showers, mainly before 9am. Partly sunny, then gradually becoming sunny, with a high near 91. Heat index values as high as 109. East wind 9 to 14 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 40%.

    High: 91 °F

    Scattered
    Showers then
    Sunny

  • Sunday Night

    Sunday Night: Scattered showers. Partly cloudy, with a low around 78. East wind 8 to 13 mph. Chance of precipitation is 30%.

    Low: 78 °F

    Scattered
    Showers

  • Monday

    Monday: Isolated showers. Mostly sunny, with a high near 91. East northeast wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Chance of precipitation is 20%.

    High: 91 °F

    Isolated
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 78. East southeast wind 7 to 13 mph.

    Low: 78 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Scattered showers, mainly after noon. Mostly sunny, with a high near 92. East wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 30%.

    High: 92 °F

    Mostly Sunny
    then
    Scattered
    Showers

  • Tuesday Night

    Tuesday Night: Scattered showers. Partly cloudy, with a low around 78. East southeast wind 6 to 9 mph. Chance of precipitation is 30%.

    Low: 78 °F

    Scattered
    Showers

Detailed Forecast

Overnight
Isolated showers. Partly cloudy, with a low around 78. East southeast wind 9 to 11 mph. Chance of precipitation is 20%.
Saturday
Scattered showers, mainly after 3pm. Mostly sunny, with a high near 91. Heat index values as high as 110. East northeast wind 8 to 13 mph increasing to 15 to 20 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
Isolated showers. Partly cloudy, with a low around 78. East southeast wind 8 to 11 mph. Chance of precipitation is 20%.
Sunday
Scattered showers, mainly before 9am. Partly sunny, then gradually becoming sunny, with a high near 91. Heat index values as high as 109. East wind 9 to 14 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 40%.
Sunday Night
Scattered showers. Partly cloudy, with a low around 78. East wind 8 to 13 mph. Chance of precipitation is 30%.
Monday
Isolated showers. Mostly sunny, with a high near 91. East northeast wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 78. East southeast wind 7 to 13 mph.
Tuesday
Scattered showers, mainly after noon. Mostly sunny, with a high near 92. East wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 30%.
Tuesday Night
Scattered showers. Partly cloudy, with a low around 78. East southeast wind 6 to 9 mph. Chance of precipitation is 30%.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Scattered showers. Partly cloudy, with a low around 79. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 91.
Thursday Night
Clear, with a low around 79.
Friday
Scattered showers. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Antonio PR
 18.46°N 66.31°W (Elev. 49 ft)
Last Update:
9:05 pm AST Aug 21, 2026
Forecast Valid:
1am AST Aug 22, 2026-6pm AST Aug 28, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation