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
11:56 PM CDT MAR 19, 2026
Clear 63°F
Feels Like:	63°F
Dewpoint:	52°F
Rel. Hum.:	67%
Visibility:	10 miles
Wind:	SSW at 7 mph
Pressure:	30.15 inches
Last 72 hours
Local Area Snow Depth
Texas Current Weather
Texas MOS Forecast Weather

Weather Map

(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

REST OF TONIGHT
Clear. Lows in the mid 50s. Southwest winds 5 to 10 mph.

FRIDAY
Sunny. Highs in the upper 80s. Southwest winds 5 to 10 mph with gusts up to 20 mph.

FRIDAY NIGHT
Clear. Lows in the upper 50s. South winds 5 to 10 mph with gusts up to 20 mph.

SATURDAY
Sunny. Highs in the lower 90s. South winds 5 to 10 mph with gusts up to 20 mph.

SATURDAY NIGHT
Clear. Lows in the upper 50s. South winds around 10 mph with gusts up to 20 mph.

SUNDAY AND SUNDAY NIGHT
Clear. Highs in the lower 90s. Lows in the upper 50s.

MONDAY AND MONDAY NIGHT
Mostly clear. Highs in the upper 80s. Lows in the upper 50s.

TUESDAY
Partly cloudy in the morning, then clearing. Highs in the upper 80s.

TUESDAY NIGHT THROUGH THURSDAY
Mostly clear. Lows around 60. Highs in the lower 90s.

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 PM EST 3/19/2026

DAY/DATE &
WEATHER FORECAST SUMMARY

TIME
CST

TEMP
(deg. F)

FEELS
LIKE

CLOUD
COVER

PRECIP
PROB.

THUNDER
PROB.

WIND
dir./mph

REL
HUM

DEWPT
(deg. F)

Friday
20 MAR 2026

12 AM

60°

59°

Clear

0% Thunder
( 0% severe)

SSW 9

75%

52°

Low 54°

3 AM

57°

55°

Clear

SSW 9

86%

53°

High 90°

6 AM

55°

53°

Clear

0% Thunder
( 0% severe)

SSW 8

93%

53°

Clear

9 AM

67°

Clear

SSW 12

70%

57°

12 PM

82°

Clear

0% Thunder
( 1% severe)

SSW 14

43%

57°

3 PM

89°

87°

Clear

S 14

30%

54°

6 PM

85°

83°

Clear

0% Thunder
( 2% severe)

S 12

32%

52°

9 PM

72°

Clear

S 10

51%

53°

Saturday
21 MAR 2026

12 AM

64°

63°

Clear

0% Thunder
( 1% severe)

SSW 10

75%

56°

Low 56°

3 AM

61°

60°

Partly Cloudy

SSW 9

84%

56°

High 92°

6 AM

59°

58°

Partly Cloudy

0% Thunder
( 1% severe)

SSW 8

90%

56°

Partly Cloudy

9 AM

69°

Partly Cloudy

SSW 10

68%

58°

12 PM

85°

84°

Clear

0% Thunder
( 1% severe)

SSW 12

37%

56°

3 PM

91°

88°

Clear

S 13

27%

52°

6 PM

87°

84°

Clear

0% Thunder
( 2% severe)

S 12

28%

50°

9 PM

74°

Clear

S 12

48%

53°


SAN MARCOS, TX extended weather forecast
Sunday 22 MAR 2026	Monday 23 MAR 2026	Tuesday 24 MAR 2026	Wednesday 25 MAR 2026	Thursday 26 MAR 2026
Low 59°	Low 57°	Low 55°	Low 61°	Low 62°
High 90°	High 87°	High 89°	High 90°	High 88°

Clear 3% Rain	Clear 2% Rain	Clear 3% Rain	Partly Cloudy 1% Rain	Partly Cloudy 5% Rain

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SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

SAN MARCOS, TX Current Weather

SAN MARCOS, TX 78666 Weather Forecast

SAN MARCOS, TX 3 hourly weather forecast

SAN MARCOS, TX extended weather forecast

SAN MARCOS, TX
Current Weather

SAN MARCOS, TX 78666
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