SAN MARCOS, TX 78666 Weather Forecast & Current Conditions

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SAN MARCOS, TX
Current Weather

1:56 AM CDT JUN 11, 2026
Overcast
79°F
Feels Like: 83°F
Dewpoint: 75°F
Rel. Hum.: 88%
Visibility: 10 miles
Wind: S at 12 mph
Pressure: 29.88 inches
Last 72 hours

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SAN MARCOS, TX 78666
Weather Forecast

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REST OF TONIGHT
Mostly cloudy. Near steady temperature in the upper 70s. South winds around 10 mph with gusts up to 25 mph.
THURSDAY
Mostly cloudy with a slight chance of showers in the morning, then partly cloudy in the afternoon. Humid with highs in the lower 90s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent. Highest heat index readings up to 105.
THURSDAY NIGHT
Mostly clear in the evening, then becoming mostly cloudy. Lows in the mid 70s. South winds 10 to 15 mph with gusts up to 25 mph.
FRIDAY
Mostly cloudy in the morning, then partly cloudy with a slight chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Southeast 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.
SATURDAY AND SATURDAY NIGHT
Partly cloudy. Highs in the lower 90s. Lows in the mid 70s.
SUNDAY AND SUNDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms. Highs in the lower 90s. Lows in the mid 70s. Chance of rain 50 percent.
MONDAY AND MONDAY NIGHT
Mostly cloudy with showers likely with a chance of thunderstorms. Highs in the upper 80s. Lows in the lower 70s. Chance of rain 70 percent.
TUESDAY
Mostly 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 mid 80s. Chance of rain 50 percent.
TUESDAY NIGHT AND WEDNESDAY
Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the lower 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 PM EDT  6/10/2026
Thursday
11 JUN 2026
SAN MARCOS, TX 78666 weather forecast Day 1, 0 hours 1 AM 79° 82° Mostly Cloudy 8%

0% Thunder
( 6% severe)
S   13 82% 73°
Low 77° SAN MARCOS, TX 78666 weather forecast Day 1, 3 hours 4 AM 79° 83° Mostly Cloudy S   12 85% 74°
High 93° SAN MARCOS, TX 78666 weather forecast Day 1, 6 hours 7 AM 78° 80° Mostly Cloudy 4%

0% Thunder
( 9% severe)
S   9 88% 74°

Mostly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 1, 9 hours 10 AM 83° 90° Mostly Cloudy S   14 77% 75°
SAN MARCOS, TX 78666 weather forecast Day 1, 12 hours 1 PM 88° 97° Partly Cloudy 8%

0% Thunder
( 20% severe)
S   15 63% 74°
SAN MARCOS, TX 78666 weather forecast Day 1, 15 hours 4 PM 92° 103° Partly Cloudy S   14 58% 75°
SAN MARCOS, TX 78666 weather forecast Day 1, 18 hours 7 PM 90° 100° Partly Cloudy 1%

0% Thunder
( 7% severe)
SSE   16 60% 74°
SAN MARCOS, TX 78666 weather forecast Day 1, 21 hours 10 PM 83° 90° Partly Cloudy SSE   14 74% 74°
Friday
12 JUN 2026
SAN MARCOS, TX 78666 weather forecast Day 2, 0 hours 1 AM 79° 83° Partly Cloudy 5%

0% Thunder
( 6% severe)
SSE   10 85% 74°
Low 76° SAN MARCOS, TX 78666 weather forecast Day 2, 3 hours 4 AM 78° 80° Mostly Cloudy SSE   7 88% 74°
High 93° SAN MARCOS, TX 78666 weather forecast Day 2, 6 hours 7 AM 77° 78° Mostly Cloudy 3%

0% Thunder
( 11% severe)
ESE   6 90% 74°

Mostly Cloudy



SAN MARCOS, TX 78666 weather forecast Day 2, 9 hours 10 AM 83° 90° Mostly Cloudy SE   8 77% 75°
SAN MARCOS, TX 78666 weather forecast Day 2, 12 hours 1 PM 89° 97° Mostly Cloudy 8%

0% Thunder
( 29% severe)
SE   9 59% 73°
SAN MARCOS, TX 78666 weather forecast Day 2, 15 hours 4 PM 92° 101° Mostly Cloudy SE   12 54% 73°
SAN MARCOS, TX 78666 weather forecast Day 2, 18 hours 7 PM 90° 98° Partly Cloudy 4%

0% Thunder
( 11% severe)
SSE   13 56% 72°
SAN MARCOS, TX 78666 weather forecast Day 2, 21 hours 10 PM 82° 87° Partly Cloudy SSE   12 74% 73°

SAN MARCOS, TX extended weather forecast

Saturday
13 JUN 2026
Sunday
14 JUN 2026
Monday
15 JUN 2026
Tuesday
16 JUN 2026
Wednesday
17 JUN 2026
Low 73° Low 75° Low 74° Low 71° Low 69°
High 92° High 92° High 88° High 88° High 90°
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
Mostly Cloudy
19% Rain
Overcast
55% Rain
Overcast
73% Rain
Overcast
65% Rain
Overcast
26% Rain
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