Live Weather & Forecast

Weather in San Marcos

Texas, United States · Real-time conditions & 3-day outlook

Flag of United States
Overcast
22°C
Feels like 25°C
72°F / Feels 77°F
Overcast
San Marcos, Texas
🌙 Nighttime
Updated: 2026-04-13 04:15
💧
Humidity
91%
💨
Wind
17.6 km/h SSE
🌬️
Wind Gust
26.5 km/h
🌡️
Pressure
1018 mb
👁️
Visibility
16 km
☀️
UV Index
0 (Low)
🌧️
Precipitation
0.09 mm
☁️
Cloud Cover
100%
💦
Dew Point
21.5°C
🌐
Wind Degree
166°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
142.9 μg/m³
NO₂
4.6 μg/m³
O₃
61 μg/m³
SO₂
1.3 μg/m³
PM 2.5
5.6 μg/m³
PM 10
6.6 μg/m³

Weather Alerts 1

Met · Severe · Future
Flood Watch issued April 12 at 10:11AM CDT until April 13 at 7:00AM CDT by NWS Austin/San Antonio TX

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Portions of the I-35 Corridor and Coastal Plains, including the following counties, Bastrop, Caldwell, Comal, De Witt, Fayette, Gonzales, Guadalupe, Hays, Lavaca, Lee, Travis and Williamson. * WHEN...Through 7am Monday morning. * IMPACTS...There is a potential for LIFE-THREATENING flooding somewhere in the watch area. Excessi...

Ensure you have a way to receive warnings and check the notification settings on your phone to ensure Wireless Emergency Alerts are enabled. You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should f...

Effective: 2026-04-12T10:11:00-05:00  ·  Expires: 2026-04-13T07:00:00-05:00

Today's Hourly Forecast

24-hour breakdown for San Marcos, Texas

12 AM
Light drizzle
22°
Light drizzle
💧 96% 💨 21.2 km/h 🌧️ 100%
1 AM
Light drizzle
22°
Light drizzle
💧 96% 💨 20.5 km/h 🌧️ 100%
2 AM
Patchy rain nearby
22°
Patchy rain nearby
💧 94% 💨 19.8 km/h 🌧️ 100%
3 AM
Mist
22°
Mist
💧 95% 💨 18.4 km/h
4 AM
Overcast
22°
Overcast
💧 91% 💨 17.6 km/h 🌧️ 100%
5 AM
Light rain
22°
Light rain
💧 98% 💨 16.9 km/h 🌧️ 100%
6 AM
Light rain
22°
Light rain
💧 95% 💨 16.9 km/h 🌧️ 100%
7 AM
Light drizzle
22°
Light drizzle
💧 95% 💨 18 km/h 🌧️ 100%
8 AM
Mist
22°
Mist
💧 95% 💨 16.9 km/h
9 AM
Overcast
22°
Overcast
💧 97% 💨 15.8 km/h
10 AM
Patchy rain nearby
23°
Patchy rain nearby
💧 94% 💨 18 km/h 🌧️ 72%
11 AM
Overcast
24°
Overcast
💧 90% 💨 21.6 km/h
12 PM
Cloudy
25°
Cloudy
💧 88% 💨 22.3 km/h
1 PM
Partly Cloudy
26°
Partly Cloudy
💧 81% 💨 18.7 km/h
2 PM
Sunny
28°
Sunny
💧 81% 💨 18.4 km/h
3 PM
Sunny
29°
Sunny
💧 73% 💨 20.5 km/h
4 PM
Sunny
29°
Sunny
💧 70% 💨 18 km/h
5 PM
Sunny
29°
Sunny
💧 69% 💨 20.9 km/h
6 PM
Thundery outbreaks in nearby
29°
Thundery outbreaks in nearby
💧 58% 💨 25.2 km/h
7 PM
Cloudy
27°
Cloudy
💧 60% 💨 24.8 km/h
8 PM
Clear
25°
Clear
💧 68% 💨 25.2 km/h
9 PM
Clear
24°
Clear
💧 75% 💨 23.4 km/h
10 PM
Partly Cloudy
23°
Partly Cloudy
💧 81% 💨 24.5 km/h
11 PM
Overcast
22°
Overcast
💧 87% 💨 22.3 km/h

3-Day Forecast

Daily overview for San Marcos, Texas

Today
Patchy rain nearby
Patchy rain nearby
30° / 21°
🌧️ 84% chance of rain
💧 Avg. humidity: 85%
💨 Max wind: 25.2 km/h
🌧️ Total precip: 4.77 mm
☀️ UV Index: 0.9
🌅 Sunrise: 07:07 AM
🌇 Sunset: 07:58 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Overcast
Overcast
29° / 19°
🌧️ 0% chance of rain
💧 Avg. humidity: 77%
💨 Max wind: 25.9 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.5
🌅 Sunrise: 07:06 AM
🌇 Sunset: 07:58 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Wed, Apr 15
Overcast
Overcast
29° / 19°
🌧️ 0% chance of rain
💧 Avg. humidity: 73%
💨 Max wind: 24.5 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1
🌅 Sunrise: 07:05 AM
🌇 Sunset: 07:59 PM
🌙 Waning Crescent
🌑 Moon: 8% lit

Best Time to Visit San Marcos

Plan your trip to San Marcos, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to San Marcos 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in San Marcos?
Current conditions in San Marcos: Overcast, temperature 22°C, humidity 91%.
What is the best time to visit San Marcos?
The best time to visit San Marcos is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in San Marcos?
San Marcos is located at approximately 29.9° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in San Marcos?
The wettest period in San Marcos is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to San Marcos?
For visits to San Marcos during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is San Marcos in?
San Marcos is located in United States, in the state of Texas.
What are the public holidays in San Marcos in 2026?
View the 2026 public holidays for San Marcos on our Holidays page.
What are the GPS coordinates used for the weather forecast in San Marcos?
The weather forecast for San Marcos uses coordinates 29.8826, -97.9406.