San Marcos, TX Tornado History — 87 Tornadoes Since 1950
How many tornadoes has San Marcos, TX had?
San Marcos has had 87 tornadoes on record within 25 miles since 1950, including 2 violent (EF3+) tornadoes.
When was the most recent tornado near San Marcos?
The most recent tornado within 25 miles of San Marcos was an EF1 on October 24, 2025.
When is tornado season in San Marcos?
May is historically the peak month for tornadoes near San Marcos, with 22 on record. Spring through early summer (April–June) generally sees the highest activity across most of the central and southern United States.
At a Glance
Recent Tornado Activity Near San Marcos
The last 20 years of confirmed tornadoes within 25 miles — 21 total, averaging 1.1 per year over this window.
Tornadoes by Decade
Tornadoes by Enhanced Fujita Rating
F0–F5 ratings (pre-2007) are grouped with their EF equivalents. The Enhanced Fujita scale replaced the original Fujita scale in February 2007.
Tornadoes by Month
Have any tornadoes near San Marcos been fatal?
No fatalities are on record within 25 miles of San Marcos from any of the 87 tornadoes since 1950, though 39 injuries have been reported. NOAA Storm Prediction Center records.
Notable Tornadoes Near San Marcos
About Tornadoes in San Marcos
This overview was written July 27, 2026. The tornado counts and notable-event figures elsewhere on this page reflect the latest data and may differ from this summary.
The San Marcos, Texas area sits within a part of the country where tornadoes are a recurring part of the climate rather than a rare anomaly. The tornado history summarized on this page is drawn from the NOAA Storm Prediction Center's severe weather database, which covers the area within the search radius shown above. The counts, ratings and individual events listed on this page are generated directly from that database and update as it is revised, so they always reflect the current record rather than a snapshot frozen at the time this summary was written.
Activity in this area concentrates most heavily in spring, when the contrast between retreating winter air and advancing warmth is sharpest. There is also a meaningful secondary season in the autumn, a pattern common across this part of the country and one that catches people out precisely because it falls outside the spring window most residents watch. The underlying setup is a familiar one: Gulf moisture, dry air spilling off the higher terrain to the west, and a strong upper-level jet converge over the Plains. The resulting supercells are often discrete and visible for long distances, though that visibility should never be relied on as a substitute for a warning.
Tornado intensity is described using the Enhanced Fujita scale, which runs from EF0 for the weakest tornadoes to EF5 for the most extreme, and which rates a tornado by the damage it leaves behind rather than by wind speed measured directly. Most tornadoes in the area have been at the weaker end of the scale, though the record includes strong tornadoes capable of significant structural damage. A weak rating is a statement about observed damage, not a guarantee about the next storm.
One caveat is worth carrying into any look at the numbers above: the modern record begins in 1950, and reported tornado counts have risen over the decades in large part because detection and reporting have improved. Doppler radar, storm spotter networks, mobile phones and denser development all mean that tornadoes which would once have gone unrecorded are now documented. A rising count does not by itself prove that more tornadoes are forming. The practical takeaway for San Marcos residents is unchanged: know where your safe room is, keep a way to receive warnings that will wake you at night, and treat every warning as though it applies to you, because the record here shows that it can.