Summerville, SC
Local storm history & FEMA National Risk Index data
Summerville is rated Relatively Moderate for overall natural hazard risk — near the middle compared to other US counties — based on FEMA's National Risk Index for Dorchester County, SC. The county's highest-rated hazards are earthquake, hurricane, and ice storm.
Storm events near Summerville
NOAA-recorded tornado, hail, and flood events within 25 miles of Summerville's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Summerville 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 Dorchester County's FEMA National Risk Index scores, covering Summerville along with the rest of the county, not a Summerville-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 79 | Relatively Low |
| Inland Flooding | 78.7 | Relatively Moderate |
| Coastal Flooding | 59.2 | Relatively Low |
| Earthquake | 97.9 | Relatively Moderate |
| Heat Wave | 69.2 | Relatively Low |
| Tornado | 74.8 | Relatively Moderate |
| Avalanche | — | Not Applicable |
| Cold Wave | 67.9 | Relatively Moderate |
| Drought | 27.7 | Very Low |
| Hail | 45.7 | Relatively Low |
| Hurricane | 97.9 | Relatively High |
| Ice Storm | 83.4 | Relatively High |
| Landslide | 14 | Very Low |
| Lightning | 82.7 | Relatively High |
| Strong Wind | 18.7 | Relatively Low |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 68 | Relatively Moderate |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Dorchester County risk profile for disaster declarations, social vulnerability, and climate projection data.
More on Dorchester County:
Frequently asked questions
What natural hazards is Summerville, SC at risk of?
Summerville is rated Relatively Moderate for overall natural hazard risk by FEMA's National Risk Index — near the middle compared to other US counties. The highest-rated hazards for Dorchester County, where Summerville is located, are earthquake, hurricane, and ice storm.
What is Summerville's biggest natural hazard risk?
Earthquake is the highest-rated hazard for Dorchester County, where Summerville is located, scoring 97.9 out of 100 on FEMA's National Risk Index (rated "Relatively Moderate").
Is Summerville a high-risk area for natural disasters?
Somewhat — Summerville carries near the middle compared to other US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively Moderate" for Dorchester County.
Has Summerville had tornadoes, hail, or flooding?
NOAA has recorded 17 tornado, 160 hail, 144 inland flooding events within 25 miles of Summerville since 2016.