Diamond Bar, CA
Local storm history & FEMA National Risk Index data
Diamond Bar is rated Very High for overall natural hazard risk — among the most at-risk counties in the country — based on FEMA's National Risk Index for Los Angeles County, CA. The county's highest-rated hazards are inland flooding, earthquake, and wildfire.
Storm events near Diamond Bar
NOAA-recorded tornado, hail, and flood events within 25 miles of Diamond Bar's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Diamond Bar 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 Los Angeles County's FEMA National Risk Index scores, covering Diamond Bar along with the rest of the county, not a Diamond Bar-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 99.9 | Very High |
| Inland Flooding | 100 | Very High |
| Coastal Flooding | 90 | Relatively High |
| Earthquake | 100 | Very High |
| Heat Wave | 99.3 | Relatively High |
| Tornado | 97.7 | Relatively High |
| Avalanche | 92.4 | Relatively High |
| Cold Wave | 5.8 | Very Low |
| Drought | 43.5 | Relatively Low |
| Hail | 93 | Relatively Moderate |
| Hurricane | 0 | No Rating |
| Ice Storm | — | Not Applicable |
| Landslide | 99.3 | Relatively High |
| Lightning | 96.9 | Very High |
| Strong Wind | 75.2 | Relatively Moderate |
| Tsunami | 64.6 | Relatively Low |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 74.8 | Relatively Moderate |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Los Angeles County risk profile for disaster declarations, social vulnerability, and climate projection data.
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Frequently asked questions
What natural hazards is Diamond Bar, CA at risk of?
Diamond Bar is rated Very High for overall natural hazard risk by FEMA's National Risk Index — among the most at-risk counties in the country. The highest-rated hazards for Los Angeles County, where Diamond Bar is located, are inland flooding, earthquake, and wildfire.
What is Diamond Bar's biggest natural hazard risk?
Inland Flooding is the highest-rated hazard for Los Angeles County, where Diamond Bar is located, scoring 100 out of 100 on FEMA's National Risk Index (rated "Very High").
Is Diamond Bar a high-risk area for natural disasters?
Yes — Diamond Bar carries among the most at-risk counties in the country for overall natural hazard risk, per FEMA's National Risk Index rating of "Very High" for Los Angeles County.
Has Diamond Bar had tornadoes, hail, or flooding?
NOAA has recorded 4 tornado, 6 hail, 122 inland flooding events within 25 miles of Diamond Bar since 2016.