SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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SAN MARCOS, TX
Current Weather

10:56 AM CDT JUN 7, 2025
Broken Clouds
90°F
Feels Like: 101°F
Dewpoint: 75°F
Rel. Hum.: 62%
Visibility: 10 miles
Wind: S at 15 mph
Pressure: 29.95 inches
Last 72 hours

Local Area Snow Depth

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SAN MARCOS, TX 78666
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TODAY
Partly cloudy this morning, then clearing. Highs in the mid 90s. South winds 5 to 10 mph with gusts up to 20 mph. Highest heat index readings up to 107.
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.
SUNDAY
Partly cloudy in the morning, then clearing. Highs in the upper 90s. South winds 5 to 10 mph with gusts up to 20 mph. Highest heat index readings up to 107.
SUNDAY NIGHT
Partly cloudy. Lows in the mid 70s. South winds 10 to 15 mph with gusts up to 25 mph.
MONDAY
Partly cloudy. Highs in the mid 90s. South winds around 10 mph. Highest heat index readings up to 106.
MONDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 40 percent.
TUESDAY
Partly 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 lower 90s. Chance of rain 50 percent.
TUESDAY NIGHT
Mostly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent.
WEDNESDAY
Mostly cloudy with showers likely with a chance of thunderstorms. Highs in the upper 80s. Chance of rain 70 percent.
WEDNESDAY NIGHT
Cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 40 percent.
THURSDAY
Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent.
THURSDAY NIGHT
Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 70s.
FRIDAY
Mostly cloudy with a slight chance of showers in the morning, then partly cloudy with a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the lower 90s. 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  8:00 PM EDT  6/ 6/2025
Saturday
7 JUN 2025
SAN MARCOS, TX 78666 weather forecast Day 1, 0 hours 1 AM 79° 83° Partly Cloudy 1%

0% Thunder
( 3% severe)
S   12 91% 76°
Low 76° SAN MARCOS, TX 78666 weather forecast Day 1, 3 hours 4 AM 77° 78° Mostly Cloudy S   10 97% 76°
High 98° SAN MARCOS, TX 78666 weather forecast Day 1, 6 hours 7 AM 77° 78° Mostly Cloudy 0%

0% Thunder
( 6% severe)
S   10 97% 76°

Mostly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 1, 9 hours 10 AM 83° 91° Mostly Cloudy SSW   13 80% 76°
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 1 PM 92° 102° Partly Cloudy 0%

0% Thunder
( 9% severe)
S   14 56% 74°
SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 4 PM 96° 105° Partly Cloudy S   14 46% 72°
SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 7 PM 93° 101° Partly Cloudy 0%

0% Thunder
( 6% severe)
SSE   15 51% 72°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 10 PM 84° 90° Partly Cloudy S   15 67% 72°
Sunday
8 JUN 2025
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 1 AM 79° 83° Partly Cloudy 0%

0% Thunder
( 6% severe)
S   13 88% 75°
Low 75° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 4 AM 77° 78° Mostly Cloudy S   10 94% 75°
High 98° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 7 AM 76° 75° Mostly Cloudy 0%

0% Thunder
( 9% severe)
S   9 97% 75°

Partly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 10 AM 84° 93° Partly Cloudy S   10 77% 76°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 1 PM 92° 102° Clear 0%

0% Thunder
( 13% severe)
S   12 56% 74°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 4 PM 98° 107° Partly Cloudy S   12 43% 72°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 7 PM 94° 102° Partly Cloudy 0%

0% Thunder
( 7% severe)
SSE   14 49% 72°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 10 PM 85° 92° Partly Cloudy SSE   14 67% 73°

SAN MARCOS, TX extended weather forecast

Monday
9 JUN 2025
Tuesday
10 JUN 2025
Wednesday
11 JUN 2025
Thursday
12 JUN 2025
Friday
13 JUN 2025
Low 77° Low 75° Low 75° Low 74° Low 75°
High 98° High 96° High 91° High 95° High 96°
SAN MARCOS, TX 78666 weather forecast Day 3 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
Partly Cloudy
4% Rain
Mostly Cloudy
6% Rain
Overcast
48% Rain
Overcast
42% Rain
Partly Cloudy
17% Rain
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