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
8:56 PM CDT APR 29, 2026
Overcast 66°F
Feels Like:	66°F
Dewpoint:	63°F
Rel. Hum.:	90%
Visibility:	10 miles
Wind:	NNE at 17 mph
Pressure:	29.89 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
Cloudy with a slight chance of showers and thunderstorms. Lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent.

THURSDAY
Cloudy with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the upper 70s. Northeast winds 5 to 10 mph. Chance of rain 50 percent.

THURSDAY NIGHT
A chance of thunderstorms. Showers. Lows around 60. Northeast winds around 10 mph with gusts up to 20 mph. Chance of rain 90 percent.

FRIDAY
Showers. A chance of thunderstorms in the morning, then thunderstorms likely in the afternoon. Cooler with highs in the mid 60s. Temperature falling into the upper 50s in the afternoon. Northeast winds 15 to 20 mph. Gusts up to 35 mph in the afternoon. Chance of rain near 100 percent.

FRIDAY NIGHT
Mostly cloudy. A slight chance of showers in the evening. Cooler. Less humid with lows around 50. North winds 15 to 20 mph with gusts up to 35 mph.

SATURDAY
Partly cloudy in the morning, then clearing. Highs in the upper 60s.

SATURDAY NIGHT
Mostly clear. Lows in the upper 40s.

SUNDAY AND SUNDAY NIGHT
Partly cloudy. Highs in the mid 70s. Lows in the mid 50s.

MONDAY
Mostly cloudy in the morning, then becoming partly cloudy. Highs in the lower 80s.

MONDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s.

TUESDAY AND TUESDAY NIGHT
Mostly cloudy. Highs in the upper 80s. Lows in the upper 60s.

WEDNESDAY
Mostly cloudy. A slight chance of showers and thunderstorms in the morning. Highs in the upper 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 8:00 AM EDT 4/29/2026

DAY/DATE &
WEATHER FORECAST SUMMARY

Wednesday
29 APR 2026

1 PM

81°

86°

Mostly Cloudy

44%
RAIN
***

0% Thunder
( 40% severe)

ESE 8

77%

73°

High 82°

4 PM

80°

83°

Mostly Cloudy

NE 12

74%

71°

Mostly Cloudy

Chance of Rain

7 PM

77°

79°

Mostly Cloudy

10%
RAIN
.01–.1 in

0% Thunder
( 22% severe)

NE 13

76%

69°

10 PM

71°

71°

Mostly Cloudy

NNE 10

84%

66°

Thursday
30 APR 2026

1 AM

68°

68°

Mostly Cloudy

11%
RAIN
<.01 in

0% Thunder
( 18% severe)

NNE 9

87%

64°

Low 66°

4 AM

67°

67°

Mostly Cloudy

NNE 9

87%

63°

High 79°

7 AM

66°

66°

Mostly Cloudy

20%
RAIN
<.01 in

0% Thunder
( 13% severe)

NNE 8

90%

63°

Mostly Cloudy

Chance of Rain

10 AM

69°

69°

Mostly Cloudy

NNE 9

90%

66°

1 PM

75°

75°

Mostly Cloudy

24%
RAIN
.5–1 in

0% Thunder
( 22% severe)

ENE 10

76%

67°

4 PM

76°

77°

Mostly Cloudy

NE 12

74%

67°

7 PM

73°

73°

Mostly Cloudy

43%
RAIN
***

0% Thunder
( 28% severe)

NE 13

79%

66°

10 PM

68°

68°

Mostly Cloudy

NE 12

90%

65°

Friday
1 MAY 2026

1 AM

66°

66°

Mostly Cloudy

67%
RAIN
***

0% Thunder
( 35% severe)

NNE 12

90%

63°

Low 61°

4 AM

64°

63°

Mostly Cloudy

NE 12

93%

62°

High 67°

7 AM

63°

62°

Mostly Cloudy

86%
RAIN
***

0% Thunder
( 30% severe)

NE 12

93%

61°

Mostly Cloudy

Rain Likely

10 AM

63°

61°

Mostly Cloudy

NE 14

93%

61°

1 PM

63°

61°

Mostly Cloudy

82%
RAIN
***

0% Thunder
( 50% severe)

NE 16

90%

60°

4 PM

62°

59°

Mostly Cloudy

N 20

87%

58°

7 PM

59°

55°

Mostly Cloudy

N 23

83%

54°


SAN MARCOS, TX extended weather forecast
Saturday 2 MAY 2026	Sunday 3 MAY 2026	Monday 4 MAY 2026	Tuesday 5 MAY 2026	Wednesday 6 MAY 2026
Low 55°	Low 48°	Low 55°	Low 63°	Low 69°
High 74°	High 78°	High 85°	High 87°	High 89°

Mostly Cloudy 17% Rain	Partly Cloudy 5% Rain	Partly Cloudy 6% Rain	Overcast 19% Rain	Overcast 19% Rain

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