San Marcos, TX Live Doppler Radar

Live radar for San Marcos, Hays County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.

Open live radar for San MarcosWhat TALON shows

What weather hits San Marcos?

Since 1996, the National Weather Service has logged flash flooding on 103 days in the Hays forecast zone and Hays County — the most common reported hazard around San Marcos, mostly in June and May. Next come damaging thunderstorm winds (46 days) and heavy snow & winter storms (19 days).

HazardDays reportedMost recentWorst on record
Flash flooding103Jun 2026May 24, 2015 · 10 deaths · $100 million damage
Damaging thunderstorm winds46May 2026Jun 2, 2003 · $7.0 million damage
Heavy snow & winter storms19Jan 2025Feb 1, 2023 · $2.4 million damage
Flooding11Aug 2017Oct 17, 1998 · $4.0 million damage
Excessive heat8Aug 2024—
Wildfires5Aug 2023Sep 4, 2011 · $6.0 million damage
Extreme cold & wind chill5Jan 2024—
Lightning casualties & damage4May 2014May 15, 2010 · $100,000 damage

Source: NOAA NCEI Storm Events Database, 1996–2026 (the latest year is partial). A "day" is a date with at least one report in the Hays forecast zone and Hays County; damage is as reported, not adjusted for inflation.

Which radars cover San Marcos?

The closest NEXRAD Doppler radar is KEWX (San Antonio, TX), about 13 miles south-southwest. Radar beams climb as they travel, so the height of the lowest scan over town decides how low in a storm the radar can see.

RadarDistanceLowest beam over San MarcosView
KEWX
San Antonio, TX		13 mi south-southwest700 ftExcellent — the lowest scan sees close to the ground
KGRK
Central Texas, TX		67 mi north-northeast5,400 ftGood — most storms and steady rain or snow show clearly
KCRP
Corpus Christi, TX		147 mi south17,500 ftLimited — the beam overshoots the lowest part of storms

Beam height is the center of the 0.5° scan above the radar, with standard refraction. Mountains near a radar can block it further.

Tornado & hail history near San Marcos

Since 1950, NOAA has recorded 84 tornadoes within 25 miles of San Marcos, 18 of them EF2/F2 or stronger. Most came in May and October. The strongest was an F3 on December 1, 1953, which passed about 24 miles south of town. The most recent was an EF1 on October 24, 2025, which passed about 19 miles west-northwest of town.

Hail: 340 reports of 1-inch or larger hail within 25 miles since 1955, 44 of them 2 inches or more; the largest was 4.50-inch hail on March 16, 2000.

Source: NOAA Storm Prediction Center — tornadoes 1950–2025, hail 1955–2025. Distances are to each tornado's track; ratings before February 2007 use the original Fujita scale.

On TALON you get San Marcos's live radar loop, rain/snow/ice colors, flash-flood risk, storm tracks with arrival times and NWS warnings free; close-up radar and rotation detection are part of TALON Pro.

San Marcos radar FAQ

Where is the nearest weather radar to San Marcos, TX?

KEWX (San Antonio, TX), about 13 miles south-southwest. KGRK (Central Texas, TX) is 67 miles away and also covers the area.

Does radar show snow in San Marcos?

Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over San Marcos the lowest scan from KEWX is about 700 ft up.

Is TALON's radar for San Marcos free?

Yes — the US radar loop, rain/snow/ice colors, flash-flood risk, storm tracks and NWS warnings are free in any browser. Close-up radar, rotation detection and longer forecasts are part of TALON Pro.

Should I rely on radar for my safety?

No app replaces official warnings. When the National Weather Service issues a warning for San Marcos, follow it right away — see watch vs. warning.

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