Charleston County, South Carolina

What hazards hit Charleston County most?

The most frequent records are severe thunderstorm wind events: 624 since 1955. 50% of its severe thunderstorm wind events since 1955 fell in June and July. The rank column places the county among South Carolina's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Charleston County had?

NOAA records 61 tornadoes in Charleston County from 1957 to 2024, the strongest rated F3, with 0 deaths and 17 injuries recorded in the county. That is 7th of 46 South Carolina counties by days with tornadoes per 1,000 square miles since 1950. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 60 tornadoes whose track touched Charleston County since 1950 (NOAA's county records number 61: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in South Carolina.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Charleston County?

The most recent record with damage, injuries or deaths is the June 19, 2026 thunderstorm wind ($1,000 in damage in 2025 dollars).

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Charleston County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Hurricanes and tropical storms in the 2010s: 66 records against 9 in the decade before, 66 of them forecast-zone records. High wind and dust storms in the 2010s: 40 records against 12 in the decade before, 40 of them forecast-zone records. Cells marked z rose mostly through zone records. The local National Weather Service office files these once per forecast zone, so a change in how it draws its zones or splits a storm into records moves this count as much as the weather does; read it beside the Charleston County days with a record above.

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

50% of its severe thunderstorm wind events since 1955 fell in June and July. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Charleston County

FEMA's register lists 27 declarations that include Charleston County: 12 major disasters, 15 emergencies and 0 fire management assistance declarations. Most were for hurricane (16) and severe storm (3).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Charleston County had?

NOAA's Storm Events Database holds 595 flood or flash flood records for Charleston County from 1996 to 2026, on 179 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Charleston County ranks 23rd of 2,942 U.S. counties. The 100 counties with the most claims

The National Flood Insurance Program has paid $312 million on 19,289 claims filed in Charleston County; the most in one year was 9,499 in 1989. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Charleston County

FEMA's National Risk Index rates Charleston County Relatively High overall, with an expected annual loss of $500 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Charleston County

1. Charleston County 1,975
2. Colleton County 1,543
3. Berkeley County 1,119
4. Dorchester County 957
5. Georgetown County 485

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in South CarolinaEvery South Carolina tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in South CarolinaThe state's severe thunderstorm wind events, by county, year and month
• The South Carolina recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Charleston CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Charleston County's FEMA declarations (CSV)27 rows: every declaration that named the county, for your own analysis