Monsoon Flooding Threats Continue; Storms Possible in the Mid-Atlantic

Monsoon moisture will primarily stretch from the northern Great Basin to the south and central Rockies. Flash flooding, and mud and debris flows, especially on burn scars will be possible. Strong to severe storms that could produce damaging winds and locally heavy rain will be possible in the Mid-Atlantic, Deep South, and Northeast. Fire weather threats persist for portions of the Northwest. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

78°F

26°C

Humidity 97%
Wind Speed S 5 mph
Barometer 30.02 in (1015.4 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 1 Aug 2:56 am CDT
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Mostly clear, with a low around 76. South southwest wind around 5 mph.

    Mostly Clear

    Low: 76 °F

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 4pm.  Increasing clouds, with a high near 97. Heat index values as high as 105. South southwest wind 5 to 15 mph.

    Sunny then
    Chance
    T-storms

    High: 97 °F

  • Sunday
    Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am.  Mostly cloudy, with a low around 74. Southeast wind 5 to 10 mph becoming southwest after midnight.

    Chance
    T-storms

    Low: 74 °F

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 90. South wind 5 to 10 mph becoming north northwest in the afternoon.

    Chance
    T-storms

    High: 90 °F

  • Monday
    Night

    Monday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 74. North wind around 5 mph becoming calm  in the evening.

    Chance
    T-storms

    Low: 74 °F

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms.  Partly sunny, with a high near 91. North northwest wind 5 to 10 mph becoming northeast in the afternoon.

    Chance
    T-storms

    High: 91 °F

  • Tuesday
    Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Mostly cloudy, with a low around 73. East northeast wind 5 to 10 mph.

    Slight Chance
    T-storms then
    Chance
    Showers

    Low: 73 °F

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 91. East wind 5 to 10 mph.  Chance of precipitation is 30%.

    Slight Chance
    Showers then
    Chance
    T-storms

    High: 91 °F

  • Wednesday
    Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 72. East wind 5 to 10 mph.

    Slight Chance
    T-storms

    Low: 72 °F

Detailed Forecast

Overnight
Mostly clear, with a low around 76. South southwest wind around 5 mph.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 97. Heat index values as high as 105. South southwest wind 5 to 15 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 74. Southeast wind 5 to 10 mph becoming southwest after midnight.
Monday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 90. South wind 5 to 10 mph becoming north northwest in the afternoon.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. North wind around 5 mph becoming calm in the evening.
Tuesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. North northwest wind 5 to 10 mph becoming northeast in the afternoon.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 73. East northeast wind 5 to 10 mph.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. East wind 5 to 10 mph. Chance of precipitation is 30%.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. East wind 5 to 10 mph.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92. Chance of precipitation is 40%.
Thursday Night
Partly cloudy, with a low around 74.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 95.
Click Map For Forecast
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
2:13 am CDT Aug 1, 2021
3am CDT Aug 1, 2021-6pm CDT Aug 7, 2021
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database