SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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SAN MARCOS, TX
Current Weather

6:56 PM CST FEB 27, 2026
Clear
77°F
Feels Like: 78°F
Dewpoint: 48°F
Rel. Hum.: 36%
Visibility: 10 miles
Wind: SSE at 6 mph
Pressure: 29.94 inches
Last 72 hours

Local Area Snow Depth

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SAN MARCOS, TX 78666
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Clear. Patchy fog after midnight. Lows in the mid 50s. Southeast winds around 5 mph.
SATURDAY
Patchy fog in the morning. Sunny. Highs in the mid 80s. South winds 10 to 15 mph with gusts up to 25 mph.
SATURDAY NIGHT
Clear in the evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 50s. South winds 5 to 10 mph with gusts up to 20 mph.
SUNDAY
Mostly cloudy in the morning, then clearing. Patchy fog in the morning. Highs in the lower 80s. South winds 10 to 15 mph with gusts up to 25 mph.
SUNDAY NIGHT
Mostly clear in the evening, then becoming mostly cloudy. Lows around 60. South winds 10 to 15 mph with gusts up to 25 mph.
MONDAY AND MONDAY NIGHT
Partly cloudy. Highs in the lower 80s. Lows in the lower 60s.
TUESDAY
Mostly cloudy in the morning, then becoming partly cloudy. Highs in the mid 80s.
TUESDAY NIGHT
Partly cloudy in the evening, then cloudy with a slight chance of showers after midnight. Lows in the mid 60s.
WEDNESDAY
Cloudy in the morning, then becoming partly cloudy. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent.
WEDNESDAY NIGHT
Cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Chance of rain 50 percent.
THURSDAY
Mostly cloudy with a chance of showers in the morning, then partly cloudy with a slight chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30 percent.
THURSDAY NIGHT
Partly cloudy in the evening, then becoming cloudy. A slight chance of showers. Lows in the mid 60s.
FRIDAY
Mostly cloudy with a slight chance of showers in the morning, then partly cloudy with a chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30 percent.

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 AM EST  2/27/2026
Friday
27 FEB 2026
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 12 PM 82° 81° Clear 0%

0% Thunder
( 0% severe)
E   10 37% 53°
High 87° SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 3 PM 86° 83° Clear E   9 25% 46°
Clear



SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 6 PM 81° 80° Clear 0%

0% Thunder
( 1% severe)
E   7 26% 43°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 9 PM 67° 67° Clear E   6 39% 41°
Saturday
28 FEB 2026
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 12 AM 60° 60° Clear 0%

0% Thunder
( 1% severe)
E   5 51% 42°
Low 54° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 3 AM 57° 58° Clear SE   2 72% 48°
High 86° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 6 AM 56° 56° Partly Cloudy 0%

0% Thunder
( 0% severe)
SSE   2 86% 52°

Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 9 AM 64° 64° Partly Cloudy S   7 81% 58°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 12 PM 79° 80° Clear 0%

0% Thunder
( 0% severe)
S   13 47% 57°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 3 PM 85° 83° Clear S   14 33% 53°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 6 PM 80° 80° Clear 0%

0% Thunder
( 1% severe)
SSE   13 36% 51°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 9 PM 68° 68° Clear SSE   12 59% 53°
Sunday
1 MAR 2026
SAN MARCOS, TX 78666 weather forecast Day 3, 0 hours 12 AM 61° 60° Partly Cloudy 1%

0% Thunder
( 1% severe)
S   8 84% 56°
Low 57° SAN MARCOS, TX 78666 weather forecast Day 3, 3 hours 3 AM 61° 60° Mostly Cloudy S   8 90% 58°
High 85° SAN MARCOS, TX 78666 weather forecast Day 3, 6 hours 6 AM 61° 60° Mostly Cloudy 2%

0% Thunder
( 0% severe)
S   8 93% 59°

Decreasing Clouds



SAN MARCOS, TX 78666 weather forecast Day 3, 9 hours 9 AM 66° 66° Mostly Cloudy S   12 84% 61°
SAN MARCOS, TX 78666 weather forecast Day 3, 15 hours 12 PM 77° 79° Partly Cloudy 0%

0% Thunder
( 1% severe)
S   15 56% 60°
SAN MARCOS, TX 78666 weather forecast Day 3, 18 hours 3 PM 84° 83° Clear S   17 40% 57°
SAN MARCOS, TX 78666 weather forecast Day 3, 21 hours 6 PM 79° 80° Clear     SSE   17 44% 55°

SAN MARCOS, TX extended weather forecast

Monday
2 MAR 2026
Tuesday
3 MAR 2026
Wednesday
4 MAR 2026
Thursday
5 MAR 2026
Friday
6 MAR 2026
Low 61° Low 62° Low 68° Low 63° Low 67°
High 82° High 88° High 83° High 83° High 87°
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 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Partly Cloudy
3% Rain
Partly Cloudy
10% Rain
Mostly Cloudy
12% Rain
Partly Cloudy
19% Rain
Mostly Cloudy
15% Rain
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