San Anselmo, CA
Local storm history & FEMA National Risk Index data
San Anselmo is rated Relatively High for overall natural hazard risk — higher risk than most US counties — based on FEMA's National Risk Index for Marin County, CA. The county's highest-rated hazards are landslide, earthquake, and coastal flooding.
Storm events near San Anselmo
NOAA-recorded tornado, hail, and flood events within 25 miles of San Anselmo's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to San Anselmo itself, not the whole county.
County-wide hazard risk
Every other hazard FEMA and NOAA track — including drought — is only scored at the county level. These are Marin County's FEMA National Risk Index scores, covering San Anselmo along with the rest of the county, not a San Anselmo-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 94.6 | Relatively Moderate |
| Inland Flooding | 96.5 | Relatively High |
| Coastal Flooding | 97.2 | Very High |
| Earthquake | 98.7 | Relatively High |
| Heat Wave | 74.6 | Relatively Low |
| Tornado | 18.6 | Very Low |
| Avalanche | — | Not Applicable |
| Cold Wave | 0 | No Rating |
| Drought | 51.6 | Relatively Low |
| Hail | 3.7 | Very Low |
| Hurricane | — | Not Applicable |
| Ice Storm | — | Not Applicable |
| Landslide | 99.2 | Relatively High |
| Lightning | 34.1 | Relatively Low |
| Strong Wind | 11.2 | Very Low |
| Tsunami | 69.2 | Relatively Moderate |
| Volcanic Activity | 63.5 | Very Low |
| Winter Weather | 4 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Marin County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Marin County:
More on Marin County:
Frequently asked questions
What natural hazards is San Anselmo, CA at risk of?
San Anselmo is rated Relatively High for overall natural hazard risk by FEMA's National Risk Index — higher risk than most US counties. The highest-rated hazards for Marin County, where San Anselmo is located, are landslide, earthquake, and coastal flooding.
What is San Anselmo's biggest natural hazard risk?
Landslide is the highest-rated hazard for Marin County, where San Anselmo is located, scoring 99.2 out of 100 on FEMA's National Risk Index (rated "Relatively High").
Is San Anselmo a high-risk area for natural disasters?
Yes — San Anselmo carries higher risk than most US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively High" for Marin County.
Has San Anselmo had tornadoes, hail, or flooding?
NOAA has recorded 44 hail, 331 inland flooding events within 25 miles of San Anselmo since 2016.