SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

Local Weather
- Local weather by ZIP or City
- Local area snow depth
- CURRENT WEATHER MAPS
- - Fronts & Pressure Centers
- - Current U.S. Temperatures
- - Northwest U.S.
- - Northeast U.S.
- - Mid-Atlantic U.S.
- - Midwest U.S.
- - Central Plains U.S.
- - Southeast U.S.
- - Southern Plains U.S.
- - Southwest U.S.
- - Alaska
10 Day Forecasts
Other Forecasts
- Snowstorm Forecast
- U.S. 6-hourly Snowfall Forecast
- 3 DAY NAM MODEL FORECASTS
- - Clouds & Precipitation
- - Temperature
- 7 DAY NWS FORECASTS
- - Weather Type
- - Precip. Probability
- - High Temperatures
- - Low Temperatures
- - Cloud Cover
- - Wind
- - Relative Humidity
- - Dewpoint
- - Snowfall
- SEASONAL FORECASTS
- - Temperature
- - Precipitation
Severe Weather
Radar
- U.S. RADAR (NWS interactive)
- U.S. RADAR (by state)
Satellite

78666 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)

CURRENT WEATHER
SAN MARCOS, TX Current Weather
6:56 PM CDT OCT 26, 2026
Clear 73°F
Feels Like:	73°F
Dewpoint:	61°F
Rel. Hum.:	66%
Visibility:	10 miles
Wind:	ESE at 6 mph
Pressure:	30.14 inches
Last 72 hours
Local Area Snow Depth
Texas Current Weather
Texas MOS Forecast Weather

Regional Weather Maps

(Automated weather data from NWS/FAA)

78666 WEATHER FORECAST
10-Day model forecast maps 2026 Hurricanes	SAN MARCOS, TX 78666 Weather Forecast	Snowfall Forecast pages Snow Depth pages

TONIGHT
Mostly cloudy. Lows in the lower 60s. Southeast winds around 5 mph.

TUESDAY
Mostly cloudy with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs around 80. Southeast winds 5 to 10 mph. Chance of rain 20 percent.

TUESDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 60s. Southeast winds around 5 mph.

WEDNESDAY
Mostly cloudy in the morning, then becoming partly cloudy. A slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Southeast winds around 5 mph.

WEDNESDAY NIGHT
Mostly cloudy. Lows in the mid 60s. Southeast winds around 5 mph.

THURSDAY AND THURSDAY NIGHT
Cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the upper 70s. Lows in the lower 60s. Chance of rain 50 percent.

FRIDAY
Mostly cloudy with a slight chance of thunderstorms. Showers likely, mainly in the morning. Highs in the mid 70s. Chance of rain 60 percent.

FRIDAY NIGHT
A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the lower 60s.

SATURDAY
Mostly cloudy with a slight chance of showers. Highs in the lower 80s.

SATURDAY NIGHT THROUGH MONDAY
Partly cloudy. Lows in the mid 60s. Highs in the mid 80s.

78666 WEATHER SATELLITE LOOPS

Visible Weather Satellite
SAN MARCOS, TX 78666

Infrared Weather Satellite
SAN MARCOS, TX 78666

78666 WEATHER RADAR LOOP

NEXRAD Weather Radar
SAN MARCOS, TX 78666

MOS COMPUTER WEATHER FORECAST

SAN MARCOS, TX 3 hourly weather forecast

weather forecast created 7:00 AM EST 10/26/2026

DAY/DATE &
WEATHER FORECAST SUMMARY

Monday
26 OCT 2026

12 PM

79°

80°

Mostly Cloudy

1%

0% Thunder
( 0% severe)

SE 6

47%

57°

High 83°

3 PM

82°

82°

Mostly Cloudy

SE 5

41%

56°

Mostly Cloudy

6 PM

77°

79°

Mostly Cloudy

1%

0% Thunder
( 2% severe)

ESE 5

50%

57°

9 PM

70°

70°

Mostly Cloudy

E 5

66%

58°

Tuesday
27 OCT 2026

12 AM

66°

66°

Mostly Cloudy

3%

0% Thunder
( 3% severe)

SE 3

87%

62°

Low 62°

3 AM

64°

65°

Mostly Cloudy

E 3

93%

62°

High 83°

6 AM

63°

64°

Mostly Cloudy

18%
RAIN
<.01 in

0% Thunder
( 5% severe)

NE 3

97%

62°

Mostly Cloudy

Chance of Rain

9 AM

72°

72°

Mostly Cloudy

ESE 6

79%

65°

12 PM

78°

80°

Mostly Cloudy

20%
RAIN
<.01 in

0% Thunder
( 16% severe)

SE 8

62%

64°

3 PM

81°

83°

Mostly Cloudy

ESE 9

56%

64°

6 PM

75°

75°

Partly Cloudy

13%
RAIN
.01–.1 in

0% Thunder
( 10% severe)

ESE 8

69%

64°

9 PM

69°

69°

Partly Cloudy

ESE 5

87%

65°

Wednesday
28 OCT 2026

12 AM

66°

66°

Partly Cloudy

5%

0% Thunder
( 11% severe)

SE 2

100%

66°

Low 62°

3 AM

65°

65°

Partly Cloudy

ESE 2

100%

65°

High 85°

6 AM

65°

65°

Mostly Cloudy

8%

0% Thunder
( 10% severe)

ENE 3

100%

65°

Mostly Cloudy

Chance of Rain

9 AM

73°

73°

Mostly Cloudy

ESE 6

90%

70°

12 PM

81°

84°

Mostly Cloudy

36%
RAIN
.5–1 in

0% Thunder
( 17% severe)

SE 8

65%

68°

3 PM

83°

86°

Partly Cloudy

SE 8

59%

67°

6 PM

76°

77°

Mostly Cloudy

SSE 9

76%

68°


SAN MARCOS, TX extended weather forecast
Thursday 29 OCT 2026	Friday 30 OCT 2026	Saturday 31 OCT 2026	Sunday 1 NOV 2026	Monday 2 NOV 2026
Low 63°	Low 62°	Low 60°	Low 59°	Low 59°
High 81°	High 70°	High 76°	High 80°	High 85°

Overcast 35% Rain	Overcast 71% Rain	Overcast 27% Rain	Mostly Cloudy 22% Rain	Partly Cloudy 14% Rain

WEATHER 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 © 2026 WeatherStreet.com

Put our free WeatherStreet weather lookup on your web page.

Terms & Conditions
This is not clickable - please e-mail us separately

This is not clickable - please e-mail us separately