San Marcos, TX Weather Forecast
Hays County, Texas
Seven-day outlook
50–84°F across the weekThe week runs between 55° and 84°, with Monday the warmest day of it. There is no real trend across it: one day looks much like the next. Tomorrow is the wettest day, peaking near 66%. 4 of the 7 days stay dry.
Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
The written summaries on this page are generated from the forecast data above, not by a meteorologist. Each sentence is a reading of the same numbers you can see, and no forecaster has reviewed them.
About the San Marcos forecast
San Marcos sits at 29.8724°N, 97.9360°W in Hays County, Texas. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- Hays County
- Coordinates
- 29.8724°N, 97.9360°W
- Population
- 71,569 · 2023 estimate
- Land area
- 38.871 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for San Marcos, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see San Marcos?
The nearest Doppler radar is KEWX (Austin/San Antonio, TX), 13 miles to the SSW. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches San Marcos its center is about 680 ft above ground. That is about as close as radar coverage gets in the United States: the lowest scan is still near the ground when it reaches San Marcos, so low-level rotation and the leading edge of a gust front show up on it. San Marcos is closer to its radar than 93% of US cities.
The closest instrument actually measuring the air is KHYI · San Marcos Muni on the ASOS/AWOS network, 4.5 miles away. Close enough that its readings are, for practical purposes, the conditions in town.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the Texas observing network as of this build.
Forecasts near San Marcos
- Kyle, TX9 mi
- Wimberley, TX12 mi
- Lockhart, TX15 mi
- Buda, TX15 mi
- New Braunfels, TX16 mi
- Seguin, TX20 mi
- Luling, TX22 mi
- Dripping Springs, TX24 mi
Elsewhere in Texas
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