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

Excessive Rainfall Areas Today; Tropical Storm Jerry Forms

Heavy to excessive rainfall is possible today and tonight ahead of and along a cold front crossing portions of Kentucky, middle Tennessee, the Ohio Valley and New Mexico. Tropical Storm Jerry, the tenth named storm of the 2025 season, has formed over the central tropical Atlantic. Jerry is expected to be near or north of the northern Leeward Islands on Thursday and Friday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

89°F

32°C

Humidity 50%
Wind Speed E 6 mph
Barometer 30.06 in (1017.0 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 7 Oct 12:56 pm CDT
Extended Forecast for

San Marcos TX

  • This Afternoon

    This Afternoon: A chance of sprinkles. Mostly sunny, with a high near 93. East wind around 5 mph.

    High: 93 °F

    Chance
    Sprinkles

  • Tonight

    Tonight: Partly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 93. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 93 °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 93. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 93 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. Northeast wind 5 to 10 mph.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90. Northeast wind 5 to 10 mph.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 57. Northeast wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 90. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 90 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of sprinkles. Mostly sunny, with a high near 93. East wind around 5 mph.
Tonight
Partly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 93. 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 93. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 63. Northeast wind 5 to 10 mph.
Friday
Sunny, with a high near 90. Northeast wind 5 to 10 mph.
Friday Night
Clear, with a low around 57. Northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 90. Calm wind becoming east southeast around 5 mph in the afternoon.
Saturday Night
Clear, with a low around 61.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 65.
Columbus Day
Sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
1:14 pm CDT Oct 7, 2025
Forecast Valid:
1pm CDT Oct 7, 2025-6pm CDT Oct 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation