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

Showers and Thunderstorms in the Southwest and Ohio Valley; Mountain Snow in the Northeast

Showers and thunderstorms, along with high-elevation snow, will begin to develop over parts of the Southwest late tonight and is expected to continue through Wednesday morning. Mountain snow over parts the Northeast will continue through Tuesday. A few strong to severe storms and heavy rainfall are possible across portions of the Lower Ohio Valley Tuesday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

74°F

23°C

Humidity 85%
Wind Speed S 10 mph
Barometer 29.95 in (1013.3 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 18 Nov 1:56 am CST
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Overnight

    Overnight: A slight chance of drizzle after 3am. Cloudy, with a low around 70. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 70 °F

    Slight Chance
    Drizzle

  • Tuesday

    Tuesday: A slight chance of drizzle before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 85. South wind 5 to 10 mph.

    High: 85 °F

    Slight Chance
    Drizzle then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of drizzle after midnight. Increasing clouds, with a low around 67. South wind around 5 mph.

    Low: 67 °F

    Partly Cloudy
    then Slight
    Chance
    Drizzle

  • Wednesday

    Wednesday: A chance of drizzle before noon, then a slight chance of showers after noon. Mostly cloudy, with a high near 84. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 84 °F

    Chance
    Drizzle

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind around 10 mph.

    Low: 68 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 78. South southeast wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 63. South southeast wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%.

    Low: 63 °F

    Showers
    Likely

  • Friday

    Friday: A 40 percent chance of showers before noon. Mostly sunny, with a high near 80. West northwest wind 5 to 10 mph.

    High: 80 °F

    Chance
    Showers then
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56. North northwest wind around 5 mph.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
A slight chance of drizzle after 3am. Cloudy, with a low around 70. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
A slight chance of drizzle before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 85. South wind 5 to 10 mph.
Tuesday Night
A slight chance of drizzle after midnight. Increasing clouds, with a low around 67. South wind around 5 mph.
Wednesday
A chance of drizzle before noon, then a slight chance of showers after noon. Mostly cloudy, with a high near 84. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind around 10 mph.
Thursday
Showers likely, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 78. South southeast wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 63. South southeast wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%.
Friday
A 40 percent chance of showers before noon. Mostly sunny, with a high near 80. West northwest wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 56. North northwest wind around 5 mph.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 74.
Saturday Night
A 30 percent chance of showers. Partly cloudy, with a low around 53.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 73.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 55.
Monday
A 40 percent chance of showers. Partly sunny, with a high near 74.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
12:50 am CST Nov 18, 2025
Forecast Valid:
2am CST Nov 18, 2025-6pm CST Nov 24, 2025
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation