SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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78666 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)

CURRENT WEATHER
SAN MARCOS, TX Current Weather
9:56 PM CST JAN 12, 2026
Clear 48°F
Feels Like:	48°F
Dewpoint:	25°F
Rel. Hum.:	40%
Visibility:	10 miles
Wind:	Calm
Pressure:	30.38 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 2025 Hurricanes	SAN MARCOS, TX 78666 Weather Forecast	Snowfall Forecast pages Snow Depth pages

TONIGHT
Mostly cloudy. A chance of showers after midnight. Lows in the mid 40s. South winds around 5 mph, becoming west after midnight. Chance of rain 30 percent.

TUESDAY
Mostly cloudy. A slight chance of showers in the morning. Highs around 60. Southwest winds 5 to 10 mph. Chance of rain 20 percent.

TUESDAY NIGHT
Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 40s. Southwest winds 5 to 10 mph.

WEDNESDAY
Mostly sunny. Highs in the upper 60s. Northwest winds 10 to 15 mph, becoming north 15 to 20 mph in the afternoon.

WEDNESDAY NIGHT
Clear. Lows in the mid 30s. North winds 5 to 10 mph. Gusts up to 25 mph in the evening.

THURSDAY AND THURSDAY NIGHT
Clear. Highs in the lower 60s. Lows around 40.

FRIDAY
Sunny. Highs in the upper 60s.

FRIDAY NIGHT AND SATURDAY
Mostly clear. Lows in the upper 30s. Highs in the lower 60s.

SATURDAY NIGHT AND SUNDAY
Clear. Lows in the upper 30s. Highs in the lower 60s.

SUNDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 30s.

MARTIN LUTHER KING JR DAY
Partly cloudy. Highs in the lower 60s.

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 1/12/2026

DAY/DATE &
WEATHER FORECAST SUMMARY

Monday
12 JAN 2026

12 PM

59°

60°

Mostly Cloudy

1%

0% Thunder
( 0% severe)

NE 2

33%

30°

High 64°

3 PM

63°

64°

Mostly Cloudy

E 3

29%

30°

Mostly Cloudy

6 PM

58°

59°

Mostly Cloudy

12%
RAIN
<.01 in

0% Thunder
( 0% severe)

ESE 2

34%

30°

9 PM

51°

51°

Mostly Cloudy

SSE 1

44%

30°

Tuesday
13 JAN 2026

12 AM

48°

47°

Mostly Cloudy

28%
RAIN
<.01 in

0% Thunder
( 1% severe)

WNW 1

54%

32°

Low 44°

3 AM

47°

46°

Mostly Cloudy

W 3

60%

34°

High 62°

6 AM

46°

44°

Mostly Cloudy

15%
RAIN
<.01 in

0% Thunder
( 1% severe)

W 5

65%

35°

Mostly Cloudy

9 AM

51°

50°

Overcast

W 5

63%

39°

12 PM

59°

58°

Mostly Cloudy

11%
RAIN
<.01 in

0% Thunder
( 0% severe)

W 7

47%

39°

3 PM

61°

60°

Mostly Cloudy

W 8

46%

40°

6 PM

57°

56°

Partly Cloudy

1%

0% Thunder
( 1% severe)

WSW 7

51%

39°

9 PM

50°

47°

Partly Cloudy

SW 7

66%

39°

Wednesday
14 JAN 2026

12 AM

47°

44°

Clear

0%

0% Thunder
( 1% severe)

WSW 7

76%

40°

Low 41°

3 AM

46°

42°

Clear

WSW 8

79%

40°

High 70°

6 AM

44°

39°

Clear

0%

0% Thunder
( 0% severe)

W 8

82%

39°

Clear

9 AM

52°

48°

Clear

NW 12

61%

39°

12 PM

66°

66°

Partly Cloudy

0%

0% Thunder
( 0% severe)

N 17

33%

36°

3 PM

69°

69°

Clear

N 20

30%

36°

6 PM

61°

59°

Clear

N 14

35%

33°


SAN MARCOS, TX extended weather forecast
Thursday 15 JAN 2026	Friday 16 JAN 2026	Saturday 17 JAN 2026	Sunday 18 JAN 2026	Monday 19 JAN 2026
Low 38°	Low 30°	Low 32°	Low 36°	Low 45°
High 59°	High 65°	High 62°	High 67°	High 74°

Clear 2% Rain	Clear 6% Rain	Partly Cloudy 10% Rain	Clear 4% Rain	Clear 8% Rain

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