SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

Enter ZIP code or City, State   
    


SAN MARCOS, TX
Current Weather

10:56 PM CST FEB 4, 2026
Clear
45°F
Feels Like: 41°F
Dewpoint: 39°F
Rel. Hum.: 79%
Visibility: 10 miles
Wind: NW at 8 mph
Pressure: 30.48 inches
Last 72 hours

Local Area Snow Depth

Texas Current Weather

Texas MOS Forecast Weather


Weather Map


(Automated weather data from NWS/FAA)
10-Day model forecast maps
2025 Hurricanes

SAN MARCOS, TX 78666
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Clear. Lows in the upper 30s. North winds 5 to 10 mph.
THURSDAY
Sunny. Highs in the upper 60s. Northwest winds around 5 mph.
THURSDAY NIGHT
Clear. Lows in the mid 40s. West winds 5 to 10 mph.
FRIDAY
Sunny. Not as cool with highs in the upper 70s. West winds 5 to 10 mph with gusts up to 20 mph, becoming north in the afternoon.
FRIDAY NIGHT
Clear. Lows in the mid 40s. South winds around 5 mph, becoming west after midnight.
SATURDAY
Sunny. Highs in the upper 70s.
SATURDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s.
SUNDAY
Partly cloudy in the morning, then becoming mostly cloudy. Highs in the upper 70s.
SUNDAY NIGHT
Partly cloudy. Lows in the lower 50s.
MONDAY
Mostly cloudy. Highs in the mid 70s.
MONDAY NIGHT AND TUESDAY
Mostly cloudy with a slight chance of showers. Lows in the mid 50s. Highs in the mid 70s.
TUESDAY NIGHT AND WEDNESDAY
Partly cloudy. Lows in the mid 50s. Highs in the mid 70s.

Visible Weather Satellite
SAN MARCOS, TX 78666
Infrared Weather Satellite
SAN MARCOS, TX 78666
NEXRAD Weather Radar
SAN MARCOS, TX 78666

SAN MARCOS, TX 3 hourly weather forecast

weather forecast created  7:00 PM EST  2/ 4/2026
Thursday
5 FEB 2026
SAN MARCOS, TX 78666 weather forecast Day 1, 0 hours 12 AM 46° 43° Clear 0%

0% Thunder
( 0% severe)
NNW   6 68% 36°
Low 38° SAN MARCOS, TX 78666 weather forecast Day 1, 3 hours 3 AM 42° 38° Clear NNW   6 79% 36°
High 71° SAN MARCOS, TX 78666 weather forecast Day 1, 6 hours 6 AM 39° 35° Clear 0%

0% Thunder
( 0% severe)
NW   6 85% 35°

Clear



SAN MARCOS, TX 78666 weather forecast Day 1, 9 hours 9 AM 49° 47° Clear NW   5 66% 38°
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 12 PM 64° 64° Clear 0%

0% Thunder
( 0% severe)
WNW   7 33% 34°
SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 3 PM 70° 70° Clear WNW   8 21% 28°
SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 6 PM 64° 65° Clear 0%

0% Thunder
( 0% severe)
W   5 24% 27°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 9 PM 53° 51° Clear WSW   7 39% 29°
Friday
6 FEB 2026
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 12 AM 49° 45° Clear 0%

0% Thunder
( 0% severe)
W   8 48% 30°
Low 43° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 3 AM 47° 43° Clear W   9 51% 30°
High 80° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 6 AM 46° 42° Clear 0%

0% Thunder
( 0% severe)
W   8 49% 28°

Clear



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 9 AM 57° 55° Clear W   8 39% 32°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 12 PM 74° 74° Clear 0%

0% Thunder
( 0% severe)
NW   7 21% 32°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 3 PM 80° 78° Clear N   5 18% 33°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 6 PM 73° 73° Clear 0%

0% Thunder
( 0% severe)
E   3 24% 34°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 9 PM 59° 60° Clear SW   2 40% 35°

SAN MARCOS, TX extended weather forecast

BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
BAD DATE
BAD DAY
BAD DATE
Low 35° Low 39° Low 46° Low 49° Low 55°
High 77° High 78° High 77° High 77° High 77°
SAN MARCOS, TX 78666 weather forecast Day 3 SAN MARCOS, TX 78666 weather forecast Day 4 SAN MARCOS, TX 78666 weather forecast Day 5 SAN MARCOS, TX 78666 weather forecast Day 6 SAN MARCOS, TX 78666 weather forecast Day 7
Clear
1% Rain
Clear
2% Rain
Clear
7% Rain
Partly Cloudy
12% Rain
Mostly Cloudy
22% Rain
SELECT BOX EXAMPLES:
for LOCAL WEATHER:
SNOW DEPTH:
LOCAL WEATHER RADAR:
STATE WEATHER MAP:
San Marcos, TX
San Marcos, TX snow
San Marcos, TX radar
TX map
-or-
-or-
-or-
 
78666
78666 snow
78666 radar
 
-or-
-or-
 
 
TX
TX snow
 
 
Copyright © 2024 WeatherStreet.com
Put our free WeatherStreet weather lookup on your web page.
Terms & Conditions