Our Proprietary 10-Day Forecast

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Current warnings over San Marcos, Texas
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over San Marcos, Texas red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over San Marcos, Texas red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Hays County, TX

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near San Marcos, Texas

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in San Marcos, TX please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over San Marcos, TX

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in San Marcos, TX, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near San Marcos, Texas

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Hays County, Texas

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
Get access to:
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  • American GFS
  • Canadian GDPS GEM
  • German DWD ICON
  • British MetOffice's UKMET Unified Model
  • American NAM
  • American HRRR
  • American NBM - National Blend of Models
  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
See the latest forecast data as the models update.
 
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Climate Summary
(made with AI, use with caution)
San Marcos, TX Climate Summary

General Climate


San Marcos, Texas, experiences a humid subtropical climate characterized by hot, humid summers and mild winters. The city enjoys a long growing season and abundant sunshine throughout the year.

Temperature


    •   Average Annual Temperature: 72.6°F (22.6°C)
    •   Average Summer Temperature (June     •   August): 86.7°F (30.4°C)
    •   Average Winter Temperature (December     •   February): 53.4°F (11.9°C)
    •   Record High Temperature: 114°F (45.6°C)
    •   Record Low Temperature: 7°F (-13.9°C)

Precipitation


    •   Average Annual Precipitation: 36.25 inches (92.1 cm)
    •   Average Summer Precipitation (June     •   August): 11.73 inches (29.8 cm)
    •   Average Winter Precipitation (December     •   February): 6.58 inches (16.7 cm)
    •   Most Precipitation in a Month: 19.11 inches (48.5 cm) in September 1921
    •   Least Precipitation in a Month: 0.01 inches (0.03 cm) in October 1954

Humidity


    •   Average Annual Humidity: 76%
    •   Average Summer Humidity (June     •   August): 80%
    •   Average Winter Humidity (December     •   February): 71%

Sunshine


    •   Average Annual Sunshine: 2,846 hours
    •   Average Summer Sunshine (June     •   August): 319 hours
    •   Average Winter Sunshine (December     •   February): 197 hours

Severe Weather


    •   San Marcos is located in an area prone to severe weather, including thunderstorms, hail, tornadoes, and occasional hurricanes.
    •   The city is also susceptible to flooding due to heavy rainfall and the proximity to the San Marcos River.

Overall, San Marcos, TX, has a pleasant climate with mild winters, hot summers, and abundant sunshine. However, residents should be prepared for occasional severe weather events.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   San Marcos is home to the Edwards Aquifer, a vast underground reservoir that supplies water to millions of Texans.

    •   The San Marcos River, fed by the aquifer, is one of the clearest and most biologically diverse rivers in Texas.

    •   The river supports a thriving ecosystem, including endangered species like the San Marcos salamander and Texas blind salamander.

Science

    •   Texas State University, located in San Marcos, is a leading research institution in environmental science and water conservation.

    •   The university's Meadows Center for Water and the Environment conducts cutting-edge research on water resources and aquatic ecosystems.

    •   San Marcos is also home to the San Marcos National Fish Hatchery, which raises endangered species like the Guadalupe bass and Rio Grande silvery minnow.

Personalities

    •   Lyndon B. Johnson, the 36th President of the United States, attended Texas State University in San Marcos.

    •   William Sidney Porter, better known as O. Henry, lived in San Marcos and wrote some of his most famous short stories there.

    •   The city is named after San Marcos de Neve, a Spanish explorer who visited the area in the 18th century.

Tourist Attractions
1.San Marcos Premium Outlets:

An upscale outdoor shopping center with over 145 stores and restaurants, including popular brands like Nike, Coach, and Michael Kors.

2.Wonder World Cave and Adventure Park:

A natural limestone cave with guided tours, a zip line, and other adventure activities.

3.Texas State University:

A public university with a beautiful campus and attractions such as the Alkek Library, the Meadows Center for Water and the Environment, and the Wittliff Collections.

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