San Dimas, CA Tornado History — 25 Tornadoes Since 1950
How many tornadoes has San Dimas, CA had?
San Dimas has had 25 tornadoes on record within 25 miles since 1950.
When was the most recent tornado near San Dimas?
The most recent tornado within 25 miles of San Dimas was an EF0 on March 13, 2025.
When is tornado season in San Dimas?
March is historically the peak month for tornadoes near San Dimas, with 8 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 Dimas
The last 20 years of confirmed tornadoes within 25 miles — 3 total, averaging 0.1 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 Dimas been fatal?
No fatalities are on record within 25 miles of San Dimas from any of the 25 tornadoes since 1950, though 6 injuries have been reported. NOAA Storm Prediction Center records.
Notable Tornadoes Near San Dimas
About Tornadoes in San Dimas
This overview was written July 29, 2026. The tornado counts and notable-event figures elsewhere on this page reflect the latest data and may differ from this summary.
San Dimas lies in the eastern San Gabriel Valley of Los Angeles County, tucked against the foothills of the San Gabriel Mountains. Tornadoes here rarely come with summer heat; instead they tend to spin up out of the cold Pacific storm systems that cross Southern California in late fall, winter, and early spring.
A striking example of that cool-season pattern came on November 9, 1982, when an F2 tornado tracked roughly 10 miles with a width reaching 1,300 yards and caused $2,750,000 in property damage; an F0 touched down in the area the same day. Other winter storms have produced briefer tornadoes, among them an F1 on November 25, 1965, and, during a run of wet winters, an F1 on December 7, 1992, and another F1 on January 14, 1993.
That rhythm has continued in recent years. An EF0 touched down on February 23, 2023, and an EF1 followed on March 22, 2023. On March 13, 2025, an EF0 touched down as well — a reminder that even a mild-looking March storm in the valley can briefly turn severe.