Tropical Storm Edouard to Impact the Northwest Gulf Coast; Heat Expands Eastward

Tropical Storm Edouard will bring tropical storm to hurricane conditions, heavy rainfall, flash and some river flooding, and storm surge to portions of Upper Texas and southwestern Louisiana coasts into Wednesday. Severe thunderstorms are possible in the Central Plains and Mid-Atlantic. Hot and humid conditions will expand from the Central Plains into the Ohio Valley and Mid-Atlantic. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

99°F

37°C

Humidity 35%
Wind Speed Calm
Barometer 29.92 in (1012.3 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 1 Sep 3:56 pm CDT
Extended Forecast for

3 Miles E Mountain City TX

  • Tonight

    Tonight: Partly cloudy, with a low around 77. East wind around 5 mph becoming calm  in the evening.

    Low: 77 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind around 5 mph becoming north northeast in the afternoon.

    High: 99 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 4am.  Partly cloudy, with a low around 77. East northeast wind 5 to 10 mph becoming south after midnight.

    Low: 77 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 10 percent chance of showers and thunderstorms before 7am.  Mostly sunny, with a high near 98. Heat index values as high as 105. South wind 5 to 10 mph.

    High: 98 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 97. South wind around 5 mph.

    High: 97 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 97 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. East southeast wind around 5 mph becoming south after midnight.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 77. East wind around 5 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind around 5 mph becoming north northeast in the afternoon.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 77. East northeast wind 5 to 10 mph becoming south after midnight.
Thursday
A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 98. Heat index values as high as 105. South wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. South wind around 5 mph.
Friday Night
Partly cloudy, with a low around 75. South wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 75. East southeast wind around 5 mph becoming south after midnight.
Sunday
Sunny, with a high near 97.
Sunday Night
Mostly clear, with a low around 75.
Labor Day
Sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 97.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Mountain City TX
 30.04°N 97.84°W (Elev. 699 ft)
2:46 pm CDT Sep 1, 2026
4pm CDT Sep 1, 2026-6pm CDT Sep 8, 2026
 
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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