What is the weather in San Marcos right now?

Current weather in San Marcos is scattered clouds.

Where can I find the hourly weather forecast for San Marcos?

This page shows hourly weather forecast for San Marcos, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for San Marcos updated regularly?

Weather data for San Marcos is updated regularly with the latest available observations and forecasts.

Now · 3:00 AM

San Marcos Weather & Hourly Forecast

United States · Texas · 78666

76°F

Partly cloudy night

Feels like: 84°F

💧 Humidity 97% 🌡 Pressure 29.91 inHg 💨 Wind 5 mph 👁 Visibility 11.7 mi ☁ Clouds 47% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for San Marcos

Today

4:00 AM

Mostly cloudy night

76° 💧 None 💨 4 mph H 97%29.91 inHg

7:00 AM

Partly cloudy night

75° 💧 0.000 in 💨 2 mph H 98%29.88 inHg

10:00 AM

Sunny

84° 💧 0.001 in 💨 7 mph H 72%29.91 inHg

1:00 PM

Strong thunderstorm

93° 💧 0.002 in 💨 6 mph H 50%29.88 inHg

4:00 PM

Mostly sunny

96° 💧 0.002 in 💨 7 mph H 44%29.80 inHg

7:00 PM

Mostly sunny

92° 💧 0.002 in 💨 8 mph H 46%29.77 inHg

10:00 PM

Clear night

84° 💧 None 💨 10 mph H 66%29.83 inHg

Tomorrow

1:00 AM

Clear night

80° 💧 None 💨 8 mph H 82%29.85 inHg

4:00 AM

Clear night

79° 💧 None 💨 7 mph H 87%29.85 inHg

7:00 AM

Clear night

77° 💧 None 💨 5 mph H 91%29.85 inHg

10:00 AM

Sunny

85° 💧 None 💨 9 mph H 69%29.91 inHg

1:00 PM

Strong thunderstorm

94° 💧 0.001 in 💨 9 mph H 49%29.88 inHg

4:00 PM

Sunny

98° 💧 0.000 in 💨 9 mph H 38%29.80 inHg

7:00 PM

Light rain

90° 💧 0.008 in 💨 12 mph H 55%29.83 inHg

10:00 PM

Mostly clear night

85° 💧 None 💨 12 mph H 67%29.91 inHg

Sunday

1:00 AM

Clear night

80° 💧 None 💨 8 mph H 84%29.94 inHg

Today

4:00 AM

Mostly cloudy night

76° 💧 None 💨 4 mph H 97%29.91 inHg

5:00 AM

Mostly cloudy night

76° 💧 None 💨 3 mph H 97%29.91 inHg

6:00 AM

Mostly cloudy night

76° 💧 None 💨 2 mph H 97%29.88 inHg

7:00 AM

Partly cloudy night

75° 💧 None 💨 2 mph H 98%29.88 inHg

8:00 AM

Sunny

77° 💧 None 💨 4 mph H 96%29.91 inHg

9:00 AM

Mostly sunny

81° 💧 0.000 in 💨 7 mph H 84%29.91 inHg

10:00 AM

Sunny

84° 💧 None 💨 7 mph H 72%29.91 inHg

11:00 AM

Sunny

88° 💧 None 💨 7 mph H 63%29.91 inHg

12:00 PM

Strong thunderstorm

91° 💧 0.001 in 💨 6 mph H 55%29.91 inHg

1:00 PM

Strong thunderstorm

93° 💧 0.001 in 💨 6 mph H 50%29.88 inHg

2:00 PM

Mostly sunny

95° 💧 0.001 in 💨 6 mph H 47%29.85 inHg

3:00 PM

Mostly sunny

96° 💧 0.000 in 💨 7 mph H 44%29.83 inHg

4:00 PM

Mostly sunny

96° 💧 0.001 in 💨 7 mph H 44%29.80 inHg

5:00 PM

Mostly sunny

95° 💧 0.001 in 💨 7 mph H 43%29.77 inHg

6:00 PM

Mostly sunny

94° 💧 0.000 in 💨 7 mph H 43%29.74 inHg

7:00 PM

Mostly sunny

92° 💧 0.000 in 💨 8 mph H 46%29.77 inHg

8:00 PM

Mostly clear night

87° 💧 0.002 in 💨 11 mph H 60%29.77 inHg

9:00 PM

Clear night

86° 💧 None 💨 11 mph H 61%29.80 inHg

10:00 PM

Clear night

84° 💧 None 💨 10 mph H 66%29.83 inHg

11:00 PM

Clear night

83° 💧 None 💨 10 mph H 73%29.85 inHg

Tomorrow

12:00 AM

Clear night

81° 💧 None 💨 9 mph H 78%29.85 inHg

1:00 AM

Clear night

80° 💧 None 💨 8 mph H 82%29.85 inHg

2:00 AM

Clear night

80° 💧 None 💨 8 mph H 85%29.85 inHg

3:00 AM

Clear night

79° 💧 None 💨 7 mph H 86%29.85 inHg

4:00 AM

Clear night

79° 💧 None 💨 7 mph H 87%29.85 inHg

5:00 AM

Clear night

78° 💧 None 💨 6 mph H 88%29.85 inHg

6:00 AM

Clear night

78° 💧 None 💨 5 mph H 90%29.85 inHg

7:00 AM

Clear night

77° 💧 None 💨 5 mph H 91%29.85 inHg

8:00 AM

Sunny

78° 💧 None 💨 6 mph H 87%29.88 inHg

9:00 AM

Mostly sunny

81° 💧 None 💨 8 mph H 77%29.91 inHg

10:00 AM

Sunny

85° 💧 None 💨 9 mph H 69%29.91 inHg

11:00 AM

Sunny

88° 💧 None 💨 9 mph H 61%29.91 inHg

12:00 PM

Sunny

91° 💧 None 💨 9 mph H 54%29.91 inHg

1:00 PM

Strong thunderstorm

94° 💧 0.000 in 💨 9 mph H 49%29.88 inHg

2:00 PM

Strong thunderstorm

96° 💧 0.000 in 💨 9 mph H 44%29.85 inHg

3:00 PM

Sunny

97° 💧 0.000 in 💨 9 mph H 41%29.83 inHg

4:00 PM

Sunny

98° 💧 0.000 in 💨 9 mph H 38%29.80 inHg

5:00 PM

Mostly sunny

98° 💧 None 💨 9 mph H 37%29.80 inHg

6:00 PM

Mostly sunny

96° 💧 None 💨 9 mph H 38%29.80 inHg

7:00 PM

Light rain

90° 💧 0.007 in 💨 12 mph H 55%29.83 inHg

8:00 PM

Mostly clear night

89° 💧 0.001 in 💨 11 mph H 53%29.85 inHg

9:00 PM

Mostly clear night

87° 💧 None 💨 12 mph H 61%29.85 inHg

10:00 PM

Mostly clear night

85° 💧 None 💨 12 mph H 67%29.91 inHg

11:00 PM

Mostly clear night

83° 💧 None 💨 12 mph H 72%29.91 inHg

Sunday

12:00 AM

Clear night

82° 💧 None 💨 9 mph H 79%29.94 inHg

1:00 AM

Clear night

80° 💧 None 💨 8 mph H 84%29.94 inHg

2:00 AM

Clear night

80° 💧 None 💨 8 mph H 87%29.94 inHg

3:00 AM

Mostly clear night

79° 💧 None 💨 6 mph H 89%29.94 inHg

4:00 AM

Clear night

79° 💧 None 💨 6 mph H 90%29.94 inHg

5:00 AM

Clear night

78° 💧 None 💨 6 mph H 92%29.94 inHg

6:00 AM

Clear night

77° 💧 None 💨 5 mph H 94%29.94 inHg

7:00 AM

Clear night

77° 💧 None 💨 5 mph H 97%29.94 inHg

4:00 PM

Mostly sunny

99° 💧 None 💨 9 mph H 34%29.88 inHg

7:00 PM

Mostly sunny

90° 💧 None 💨 12 mph H 51%29.88 inHg

10:00 PM

Mostly clear night

86° 💧 None 💨 11 mph H 63%29.94 inHg

Monday

1:00 AM

Mostly clear night

80° 💧 None 💨 9 mph H 82%29.97 inHg

4:00 AM

Mostly clear night

79° 💧 None 💨 6 mph H 86%29.97 inHg

7:00 AM

Partly cloudy night

78° 💧 None 💨 3 mph H 90%30.00 inHg

10:00 AM

Light rain

85° 💧 None 💨 8 mph H 70%30.00 inHg

1:00 PM

Mostly sunny

95° 💧 None 💨 10 mph H 40%29.97 inHg

4:00 PM

Mostly sunny

99° 💧 None 💨 11 mph H 31%29.85 inHg

7:00 PM

Mostly sunny

92° 💧 None 💨 12 mph H 46%29.85 inHg

10:00 PM

Mostly clear night

86° 💧 None 💨 12 mph H 61%29.94 inHg

Tuesday

1:00 AM

Mostly clear night

81° 💧 None 💨 9 mph H 82%30.00 inHg

4:00 AM

Mostly clear night

80° 💧 None 💨 6 mph H 86%29.97 inHg

7:00 AM

Mostly clear night

78° 💧 None 💨 4 mph H 91%30.00 inHg

10:00 AM

Mostly sunny

86° 💧 None 💨 9 mph H 66%30.03 inHg

1:00 PM

Mostly sunny

96° 💧 None 💨 10 mph H 41%30.00 inHg

4:00 PM

Mostly sunny

100° 💧 None 💨 11 mph H 32%29.91 inHg

7:00 PM

Sunny

93° 💧 None 💨 13 mph H 43%29.91 inHg

10:00 PM

Clear night

86° 💧 None 💨 11 mph H 62%30.00 inHg

Wednesday

1:00 AM

Clear night

80° 💧 None 💨 7 mph H 74%30.06 inHg

4:00 AM

Mostly clear night

77° 💧 None 💨 3 mph H 89%30.06 inHg

7:00 AM

Mostly clear night

75° 💧 None 💨 2 mph H 97%30.09 inHg

10:00 AM

Mostly sunny

84° 💧 None 💨 5 mph H 68%30.12 inHg

1:00 PM

Sunny

95° 💧 None 💨 5 mph H 40%30.12 inHg

7:00 PM

Sunny

94° 💧 None 💨 6 mph H 41%30.09 inHg

Thursday

1:00 AM

Partly cloudy night

94° 💧 None 💨 8 mph H 39%29.97 inHg

7:00 AM

Clear night

83° 💧 None 💨 6 mph H 72%30.09 inHg

1:00 PM

Sunny

78° 💧 None 💨 2 mph H 90%30.09 inHg

7:00 PM

Mostly sunny

96° 💧 None 💨 6 mph H 43%30.09 inHg

Friday

1:00 AM

Light rain

90° 💧 None 💨 7 mph H 54%30.00 inHg

7:00 AM

Overcast night

78° 💧 None 💨 1 mph H 91%30.09 inHg

1:00 PM

Partly cloudy

76° 💧 None 💨 4 mph H 94%30.06 inHg

7:00 PM

Light rain

93° 💧 None 💨 5 mph H 52%30.03 inHg

Saturday

1:00 AM

Light rain

85° 💧 None 💨 9 mph H 71%29.94 inHg

7:00 AM

Clear night

80° 💧 None 💨 4 mph H 78%30.00 inHg

1:00 PM

Sunny

75° 💧 None 💨 2 mph H 90%29.97 inHg

7:00 PM

Sunny

93° 💧 None 💨 3 mph H 39%29.91 inHg

Sunday

1:00 AM

Clear night

93° 💧 None 💨 5 mph H 28%29.77 inHg

7:00 AM

Partly cloudy night

80° 💧 None 💨 7 mph H 76%29.88 inHg

1:00 PM

Mostly cloudy

76° 💧 None 💨 3 mph H 89%29.88 inHg

7:00 PM

Mostly sunny

96° 💧 None 💨 6 mph H 37%29.88 inHg

Monday

1:00 AM

Light rain

82° 💧 None 💨 13 mph H 71%29.88 inHg

7:00 AM

Clear night

77° 💧 None 💨 11 mph H 71%29.97 inHg

1:00 PM

Mostly sunny

72° 💧 None 💨 11 mph H 67%30.03 inHg

7:00 PM

Sunny

87° 💧 None 💨 10 mph H 41%30.03 inHg

Tuesday

1:00 AM

Clear night

85° 💧 None 💨 9 mph H 35%29.94 inHg

7:00 AM

Mostly clear night

75° 💧 None 💨 6 mph H 50%30.03 inHg

1:00 PM

Mostly sunny

69° 💧 None 💨 7 mph H 59%30.03 inHg

7:00 PM

Partly cloudy

88° 💧 None 💨 7 mph H 29%30.03 inHg

Wednesday

1:00 AM

Clear night

86° 💧 None 💨 8 mph H 28%29.94 inHg

7:00 AM

Clear night

75° 💧 None 💨 6 mph H 46%30.03 inHg

1:00 PM

Partly cloudy

71° 💧 None 💨 6 mph H 55%30.03 inHg

7:00 PM

Mostly sunny

91° 💧 None 💨 11 mph H 26%30.03 inHg

Thursday

1:00 AM

Clear night

89° 💧 None 💨 9 mph H 29%29.94 inHg

7:00 AM

Mostly clear night

80° 💧 None 💨 5 mph H 50%30.03 inHg

1:00 PM

Sunny

74° 💧 None 💨 7 mph H 61%30.06 inHg

7:00 PM

Partly cloudy

90° 💧 None 💨 12 mph H 22%30.09 inHg

Friday

1:00 AM

Clear night

87° 💧 None 💨 10 mph H 20%30.00 inHg

7:00 AM

Clear night

74° 💧 None 💨 4 mph H 36%30.12 inHg

1:00 PM

Sunny

69° 💧 None 💨 7 mph H 45%30.12 inHg

In San Marcos and, more broadly, across the state of Texas: In the evening, the sky will feature a mix of sun and clouds, with temperatures remaining very hot, ranging from 93 to 97 degrees Fahrenheit. A slight chance of rain exists, with some light showers possibly bringing around 0.01 inches of rain. The probability of rain is low, at about 20 percent. Winds will be noticeable, coming from the south at speeds up to 19 mph, with gusts reaching 22 mph. Overall, expect warm and humid conditions through the evening hours, with occasional breezes that may provide brief relief from the heat.

15-Day Weather Outlook for San Marcos

TomorrowTomorrow

Strong thunderstorm 98°/77° 💧 None 💨 11 mph

Sunday, Sep 13Sun Sep 13

Light rain 99°/77° 💧 0.135 in 💨 12 mph

Monday, Sep 14Mon Sep 14

Light rain 99°/78° 💧 0.033 in 💨 12 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 100°/78° 💧 0.020 in 💨 12 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 95°/75° 💧 0.015 in 💨 13 mph

Thursday, Sep 17Thu Sep 17

Partly cloudy 94°/78° 💧 0.016 in 💨 8 mph

Friday, Sep 18Fri Sep 18

Light rain 96°/76° 💧 0.125 in 💨 7 mph

Saturday, Sep 19Sat Sep 19

Light rain 93°/75° 💧 0.069 in 💨 9 mph

Sunday, Sep 20Sun Sep 20

Partly cloudy 93°/76° 💧 None 💨 7 mph

Monday, Sep 21Mon Sep 21

Light rain 96°/72° 💧 0.088 in 💨 13 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 87°/69° 💧 None 💨 10 mph

Wednesday, Sep 23Wed Sep 23

Partly cloudy 88°/71° 💧 None 💨 8 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 91°/74° 💧 None 💨 11 mph

Friday, Sep 25Fri Sep 25

Partly cloudy 90°/69° 💧 None 💨 12 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in San Marcos

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for San Marcos

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 4:00 AM

PM2.5 Fine particles Good 1,2µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 3,0µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 32,3µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 1,1µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in San Marcos

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 9,7Very high 😊Good

Tomorrow UV 9,9Very high 😊Good

Sunday UV 9,8Very high 😊Good

Monday UV 9,2Very high 😊Good

Tuesday UV 9,0Very high 😊Good

Wednesday UV 8,0Very high —Unavailable

Thursday UV 8,0Very high —Unavailable

Hourly UV index today

7:00 AMUV 0,0 8:00 AMUV 0,2 9:00 AMUV 1,0 10:00 AMUV 2,8 11:00 AMUV 5,4 12:00 PMUV 8,0 1:00 PMUV 9,7 2:00 PMUV 9,6 3:00 PMUV 8,1 4:00 PMUV 5,1 5:00 PMUV 1,7 6:00 PMUV 0,7

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for San Marcos

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · SAN MARCOS, TEXAS

Tonight's Stargazing & Shooting Stars

Local night-sky conditions and meteor activity for Jasper.

44/100Best-hour score

No good viewing window tonight Astronomical darkness exists, but current sky conditions are unfavorable.

☁ Cloud cover 70% Real hourly forecast for the best viewing hour.

☾ Moonlight 0% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 77° high at the best hour.

✦ Estimated visible meteors Poor visibility Meteor activity may occur above the clouds, but local viewing conditions are not suitable.

Chance ≥1 meteor in 30 minNot meaningful

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

Explore current conditions and forecasts for other locations.

Spencerport US · New York · 3,630 residents Kirribilli AU · New South Wales · 3,629 residents St Peters (NSW) AU · New South Wales · 3,629 residents Fernvale (Qld) AU · Queensland · 3,629 residents Mooloolah Valley AU · Queensland · 3,629 residents Holt US · Alabama · 3,629 residents Tiger Point US · Florida · 3,628 residents Rollingwood US · California · 3,627 residents Perham US · Minnesota · 3,627 residents Beaver Dam Lake US · New York · 3,627 residents Bunk Foss US · Washington · 3,627 residents Hanover US · Minnesota · 3,626 residents St. Augusta US · Minnesota · 3,625 residents Maugansville US · Maryland · 3,624 residents North Lakeville US · Massachusetts · 3,624 residents Palmer Heights US · Pennsylvania · 3,624 residents

Forecast data for San Marcos were last refreshed today at 12:55 AM. The current forecast period extends through 13/09/2026 at 1:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.