SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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SAN MARCOS, TX
Current Weather

11:56 AM CDT JUL 2, 2026
Clear
90°F
Feels Like: 98°F
Dewpoint: 72°F
Rel. Hum.: 56%
Visibility: 8 miles
Wind: S at 8 mph
Pressure: 30.06 inches
Last 72 hours

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SAN MARCOS, TX 78666
Weather Forecast

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TODAY
Partly cloudy this morning, then clearing. Highs in the mid 90s. South winds 5 to 10 mph.
TONIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph with gusts up to 20 mph.
FRIDAY
Partly cloudy in the morning, then clearing. Highs in the mid 90s. South winds 5 to 10 mph.
FRIDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph with gusts up to 20 mph.
INDEPENDENCE DAY
Partly cloudy in the morning, then clearing. Highs in the mid 90s. South winds 5 to 10 mph.
SATURDAY NIGHT THROUGH SUNDAY NIGHT
Partly cloudy. Lows in the mid 70s. Highs in the mid 90s.
MONDAY AND MONDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms. Highs in the mid 90s. Lows in the mid 70s.
TUESDAY
Partly cloudy in the morning, then clearing. Highs in the mid 90s.
TUESDAY NIGHT AND WEDNESDAY
Mostly clear. Lows in the mid 70s. Highs in the upper 90s.

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  8:00 AM EDT  7/ 2/2026
Thursday
2 JUL 2026
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 1 PM 90° 96° Partly Cloudy 5%

0% Thunder
( 19% severe)
S   9 52% 70°
High 94° SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 4 PM 93° 98° Partly Cloudy SSE   10 46% 69°
Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 7 PM 90° 95° Clear 1%

0% Thunder
( 7% severe)
SSE   14 50% 69°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 10 PM 83° 88° Partly Cloudy SSE   10 70% 72°
Friday
3 JUL 2026
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 1 AM 79° 82° Partly Cloudy 0%

0% Thunder
( 1% severe)
S   9 79% 72°
Low 75° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 4 AM 76° 76° Partly Cloudy S   7 90% 73°
High 96° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 7 AM 75° 75° Mostly Cloudy 0%

0% Thunder
( 5% severe)
SSW   5 94% 73°

Decreasing Clouds



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 10 AM 84° 90° Partly Cloudy SSW   8 70% 73°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 1 PM 91° 97° Clear 3%

0% Thunder
( 22% severe)
S   9 50% 70°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 4 PM 94° 99° Clear S   10 43% 68°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 7 PM 92° 96° Clear 1%

0% Thunder
( 9% severe)
SSE   13 46% 68°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 10 PM 84° 90° Clear SSE   12 67% 72°
Saturday
4 JUL 2026
SAN MARCOS, TX 78666 weather forecast Day 3, 0 hours 1 AM 80° 84° Clear 0%

0% Thunder
( 2% severe)
S   12 77% 72°
Low 75° SAN MARCOS, TX 78666 weather forecast Day 3, 3 hours 4 AM 76° 76° Partly Cloudy SSW   8 90% 73°
High 97° SAN MARCOS, TX 78666 weather forecast Day 3, 6 hours 7 AM 75° 75° Partly Cloudy 0%

0% Thunder
( 3% severe)
SSW   6 94% 73°

Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 3, 9 hours 10 AM 84° 90° Partly Cloudy SSW   8 67% 72°
SAN MARCOS, TX 78666 weather forecast Day 3, 15 hours 1 PM 91° 96° Clear 0%

0% Thunder
( 16% severe)
S   10 49% 69°
SAN MARCOS, TX 78666 weather forecast Day 3, 18 hours 4 PM 95° 99° Partly Cloudy SSE   10 40% 67°
SAN MARCOS, TX 78666 weather forecast Day 3, 21 hours 7 PM 93° 96° Partly Cloudy     SE   12 41% 66°

SAN MARCOS, TX extended weather forecast

Sunday
5 JUL 2026
Monday
6 JUL 2026
Tuesday
7 JUL 2026
Wednesday
8 JUL 2026
Thursday
9 JUL 2026
Low 75° Low 75° Low 73° Low 73° Low 73°
High 99° High 97° High 98° High 99° High 99°
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
17% Rain
Mostly Cloudy
21% Rain
Partly Cloudy
19% Rain
Partly Cloudy
14% Rain
Partly Cloudy
14% Rain
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