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

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

70°F

21°C

Humidity 93%
Wind Speed SE 5 mph
Barometer 30.03 in (1016.3 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 12 Oct 1:56 am CDT
Extended Forecast for

4 Miles NNE Prairie Lea TX

  • Overnight

    Overnight: Partly cloudy, with a low around 70. Southeast wind around 5 mph.

    Low: 70 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. Heat index values as high as 101. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 93 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 95. Heat index values as high as 103. South wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 95 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 93 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 91. Southeast wind 5 to 10 mph.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Light and variable wind becoming north northeast 5 to 10 mph after midnight.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 70. Southeast wind around 5 mph.
Columbus Day
A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. Heat index values as high as 101. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 95. Heat index values as high as 103. South wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday Night
Partly cloudy, with a low around 69. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 91. Southeast wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 66. Light and variable wind becoming north northeast 5 to 10 mph after midnight.
Friday
Mostly sunny, with a high near 82. Breezy.
Friday Night
Mostly cloudy, with a low around 58.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 54.
Sunday
Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Prairie Lea TX
 29.77°N 97.7°W (Elev. 449 ft)
Last Update:
1:24 am CDT Oct 12, 2026
Forecast Valid:
2am CDT Oct 12, 2026-6pm CDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation