Heavy Rain and Flooding Threat in the Ohio Valley

Gulf moisture will combine with a cold front and will bring heavy rain and scattered flash flooding over parts of the Mid-South into the Ohio Valley through the morning and the Ohio Valley and Central Appalachians on Tuesday. Showers and thunderstorms, some severe, are expected over the Southern Rockies/Southern High Plains on Tuesday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

78°F

26°C

Humidity 82%
Wind Speed S 3 mph
Barometer 30.01 in (1015.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 7 Oct 4:56 am CDT
Extended Forecast for

San Marcos Municipal Airport TX

  • Today

    Today: A 20 percent chance of showers after 4pm.  Mostly sunny, with a high near 94. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 94 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: A 10 percent chance of showers before 7pm.  Partly cloudy, with a low around 70. East northeast wind around 5 mph becoming calm  in the evening.

    Low: 70 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 92. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 92 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Northeast wind 5 to 10 mph.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 63. East northeast wind 5 to 10 mph.

    Low: 63 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 91. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 91 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 60. East northeast wind around 5 mph becoming calm  in the evening.

    Low: 60 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 91. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 91 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers after 4pm. Mostly sunny, with a high near 94. Calm wind becoming east northeast around 5 mph in the afternoon.
Tonight
A 10 percent chance of showers before 7pm. Partly cloudy, with a low around 70. East northeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 92. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 68. Northeast wind 5 to 10 mph.
Thursday
Sunny, with a high near 91. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Clear, with a low around 63. East northeast wind 5 to 10 mph.
Friday
Sunny, with a high near 91. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 60. East northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 91. Calm wind becoming east southeast around 5 mph in the afternoon.
Saturday Night
Clear, with a low around 60.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 65.
Columbus Day
Sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.9°N 97.89°W (Elev. 604 ft)
5:18 am CDT Oct 7, 2025
5am CDT Oct 7, 2025-6pm CDT Oct 13, 2025
 
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Additional Resources

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