SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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SAN MARCOS, TX
Current Weather

3:56 PM CDT JUN 27, 2025
Clear
93°F
Feels Like: 101°F
Dewpoint: 72°F
Rel. Hum.: 51%
Visibility: 10 miles
Wind: S at 6 mph
Pressure: 30.00 inches
Last 72 hours

Local Area Snow Depth

Texas Current Weather

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(Automated weather data from NWS/FAA)
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SAN MARCOS, TX 78666
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Mostly clear this evening, then becoming partly cloudy. Lows in the lower 70s. South winds 5 to 10 mph.
SATURDAY
Partly cloudy in the morning, then clearing. Highs in the mid 90s. South winds 5 to 10 mph.
SATURDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. South winds 5 to 10 mph.
SUNDAY
Partly cloudy. Hazy in the afternoon. Highs in the lower 90s. South winds 5 to 10 mph.
SUNDAY NIGHT
Partly cloudy. Hazy. Lows in the lower 70s. South winds 5 to 10 mph.
MONDAY
Partly cloudy. Hazy. A slight chance of showers and thunderstorms in the afternoon. Highs in the lower 90s.
MONDAY NIGHT THROUGH WEDNESDAY
Partly cloudy. Hazy. Lows in the lower 70s. Highs in the mid 90s.
WEDNESDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Hazy in the evening. Lows in the lower 70s.
THURSDAY
Mostly cloudy in the morning, then partly cloudy with a slight chance of showers and thunderstorms in the afternoon. Highs in the lower 90s.
THURSDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 70s.
INDEPENDENCE DAY
Mostly cloudy in the morning, then becoming partly cloudy. 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  6/27/2025
Friday
27 JUN 2025
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 1 PM 89° 96° Partly Cloudy 14%
RAIN
.5–1 in
0% Thunder
( 12% severe)
S   8 57% 72°
High 92° SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 4 PM 91° 97° Partly Cloudy SE   10 50% 70°
Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 7 PM 88° 94° Partly Cloudy 3%

0% Thunder
( 7% severe)
SE   13 57% 71°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 10 PM 81° 86° Partly Cloudy SE   10 79% 74°
Saturday
28 JUN 2025
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 1 AM 77° 78° Partly Cloudy 1%

0% Thunder
( 2% severe)
S   8 97% 76°
Low 72° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 4 AM 75° 75° Partly Cloudy S   6 100% 75°
High 95° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 7 AM 74° 74° Mostly Cloudy 1%

0% Thunder
( 6% severe)
S   2 100% 74°

Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 10 AM 83° 91° Partly Cloudy S   6 80% 76°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 1 PM 90° 98° Partly Cloudy 4%

0% Thunder
( 20% severe)
S   8 56% 72°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 4 PM 93° 99° Partly Cloudy SSE   10 47% 70°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 7 PM 91° 97° Partly Cloudy 0%

0% Thunder
( 11% severe)
SSE   14 50% 70°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 10 PM 82° 87° Partly Cloudy SSE   10 74% 73°
Sunday
29 JUN 2025
SAN MARCOS, TX 78666 weather forecast Day 3, 0 hours 1 AM 78° 81° Partly Cloudy 0%

0% Thunder
( 3% severe)
S   8 91% 75°
Low 73° SAN MARCOS, TX 78666 weather forecast Day 3, 3 hours 4 AM 75° 75° Partly Cloudy S   5 100% 75°
High 94° SAN MARCOS, TX 78666 weather forecast Day 3, 6 hours 7 AM 74° 74° Mostly Cloudy 5%

0% Thunder
( 9% severe)
S   2 100% 74°

Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 3, 9 hours 10 AM 83° 91° Partly Cloudy S   5 80% 76°
SAN MARCOS, TX 78666 weather forecast Day 3, 15 hours 1 PM 90° 100° Partly Cloudy 8%

0% Thunder
( 27% severe)
SSE   8 60% 74°
SAN MARCOS, TX 78666 weather forecast Day 3, 18 hours 4 PM 91° 100° Partly Cloudy SSE   12 56% 73°
SAN MARCOS, TX 78666 weather forecast Day 3, 21 hours 7 PM 87° 94° Partly Cloudy     SSE   15 63% 73°

SAN MARCOS, TX extended weather forecast

Monday
30 JUN 2025
Tuesday
1 JUL 2025
Wednesday
2 JUL 2025
Thursday
3 JUL 2025
Friday
4 JUL 2025
Low 76° Low 73° Low 73° Low 74° Low 75°
High 98° High 98° High 95° High 97° High 96°
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
18% Rain
Partly Cloudy
17% Rain
Partly Cloudy
15% Rain
Mostly Cloudy
16% Rain
Partly Cloudy
17% Rain
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