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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Hazardous Weather Conditions

Current conditions at

San Antonio, Stinson Municipal Airport (KSSF)

Lat: 29.34°NLon: 98.47°WElev: 574ft.

Mostly Cloudy

77°F

25°C

Humidity 94%
Wind Speed Calm
Barometer 29.61 in (1001.2 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 18 Jun 3:53 am CDT
Extended Forecast for

San Antonio, Stinson Municipal Airport TX

Extreme Heat Warning June 18, 12:00pm until June 18, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

    Today: Sunny, with a high near 98. Heat index values as high as 113. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 98 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 79. Southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 79 °F

    Increasing
    Clouds

  • Juneteenth

    Juneteenth: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 94. Heat index values as high as 106. East southeast wind around 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 78. East southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 78 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 91 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 77. Southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 94. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77. South southeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 94. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 98. Heat index values as high as 113. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 79. Southeast wind around 10 mph, with gusts as high as 20 mph.
Juneteenth
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 94. Heat index values as high as 106. East southeast wind around 10 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 78. East southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 50 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 77. Southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 94. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 77. South southeast wind around 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 94. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Mostly sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Antonio, Stinson Municipal Airport TX
 29.35°N 98.48°W (Elev. 577 ft)
Last Update:
5:32 am CDT Jun 18, 2026
Forecast Valid:
5am CDT Jun 18, 2026-6pm CDT Jun 24, 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