SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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SAN MARCOS, TX
Current Weather

1:56 PM CDT AUG 8, 2025
Clear
99°F
Feels Like: 105°F
Dewpoint: 68°F
Rel. Hum.: 37%
Visibility: 10 miles
Wind: SW at 9 mph, gusts to 17
Pressure: 29.99 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. Lows in the mid 70s. South winds 5 to 10 mph.
SATURDAY
Sunny. Highs in the upper 90s. South winds 5 to 10 mph.
SATURDAY NIGHT
Clear. Lows in the lower 70s. South winds 5 to 10 mph.
SUNDAY
Mostly sunny. Highs in the mid 90s. Southeast winds 5 to 10 mph.
SUNDAY NIGHT
Mostly clear. Lows in the lower 70s. South winds 5 to 10 mph.
MONDAY
Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s.
MONDAY NIGHT
Mostly clear. Lows in the lower 70s.
TUESDAY
Mostly sunny in the morning, then partly cloudy with a slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s.
TUESDAY NIGHT
Partly cloudy. Lows in the lower 70s.
WEDNESDAY
Partly cloudy. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s.
WEDNESDAY NIGHT
Partly cloudy. Lows in the mid 70s.
THURSDAY
Partly cloudy in the morning, then becoming mostly sunny. Highs in the mid 90s.
THURSDAY NIGHT AND FRIDAY
Partly cloudy. Lows in the mid 70s. Highs in the mid 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  8/ 8/2025
Friday
8 AUG 2025
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 1 PM 95° 101° Clear 1%

0% Thunder
( 11% severe)
S   7 43% 69°
High 99° SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 4 PM 98° 103° Clear SSE   7 37% 67°
Clear



SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 7 PM 97° 100° Clear 1%

0% Thunder
( 7% severe)
SE   9 35% 65°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 10 PM 86° 91° Clear SSE   8 59% 70°
Saturday
9 AUG 2025
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 1 AM 81° 85° Clear 0%

0% Thunder
( 2% severe)
S   8 74% 72°
Low 74° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 4 AM 77° 78° Clear S   5 87% 73°
High 99° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 7 AM 74° 74° Clear 0%

0% Thunder
( 2% severe)
SSW   3 93% 72°

Clear



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 10 AM 85° 93° Clear SSW   5 70% 74°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 1 PM 94° 99° Clear 3%

0% Thunder
( 19% severe)
SSE   7 44% 69°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 4 PM 97° 102° Clear SE   9 39% 68°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 7 PM 94° 98° Clear 1%

0% Thunder
( 11% severe)
SE   12 41% 67°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 10 PM 84° 89° Clear SE   9 65% 71°
Sunday
10 AUG 2025
SAN MARCOS, TX 78666 weather forecast Day 3, 0 hours 1 AM 79° 82° Clear 1%

0% Thunder
( 2% severe)
S   7 82% 73°
Low 73° SAN MARCOS, TX 78666 weather forecast Day 3, 3 hours 4 AM 76° 76° Partly Cloudy S   3 94% 74°
High 97° SAN MARCOS, TX 78666 weather forecast Day 3, 6 hours 7 AM 73° 73° Partly Cloudy 4%

0% Thunder
( 4% severe)
S   1 100% 73°

Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 3, 9 hours 10 AM 84° 91° Partly Cloudy SSE   3 72% 74°
SAN MARCOS, TX 78666 weather forecast Day 3, 15 hours 1 PM 92° 97° Clear 10%
RAIN
<.01 in
0% Thunder
( 19% severe)
SE   7 47% 69°
SAN MARCOS, TX 78666 weather forecast Day 3, 18 hours 4 PM 94° 98° Partly Cloudy SE   8 41% 67°
SAN MARCOS, TX 78666 weather forecast Day 3, 21 hours 7 PM 92° 96° Partly Cloudy     SE   10 44% 67°

SAN MARCOS, TX extended weather forecast

Monday
11 AUG 2025
Tuesday
12 AUG 2025
Wednesday
13 AUG 2025
Thursday
14 AUG 2025
Friday
15 AUG 2025
Low 75° Low 73° Low 75° Low 74° Low 75°
High 97° High 95° High 99° High 100° High 100°
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
21% Rain
Mostly Cloudy
44% Rain
Partly Cloudy
20% Rain
Partly Cloudy
18% Rain
Partly Cloudy
16% Rain
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