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Weather & Climate in Irmo, SC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Irmo enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 42°F in January while summers reach 79°F in July. The area gets 310 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 45.5 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 357 feet.
Temperature
42°F Jan (5°C)
79°F Jul (26°C)
| Annual Average | 60.2°F |
| 11% above US avg | |
| January Average | 42°F (5°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 310 days/yr |
Geography
| Elevation | 357 ft (109 m) |
| Area | 6.8 sq mi (17.5 km²) |
| Population Density | 1,728/sq mi |
| Coordinates | 34.1021°N, 81.1959°W |
| Timezone | America/New_York |
| County | Fairfield County County |
| Nearest Airport | Aiken Regional (AIK) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 40.8 / 100 |
| Social Vulnerability | 90.1 / 100 |
| Community Resilience | 44.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
40 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.
| Feb 15, 2014 | 12 km ENE of Parksville, South Carolina | M4.1 | 89 km | 5 km |
| Apr 13, 1998 | 9 km S of Kershaw, South Carolina | M3.9 | 68 km | 7 km |
| Jun 29, 2022 | 6 km E of Elgin, South Carolina | M3.6 | 44 km | 3 km |
| Jun 29, 2022 | 6 km E of Elgin, South Carolina | M3.5 | 44 km | 3 km |
| Jan 3, 1992 | 4 km ENE of Willington, South Carolina | M3.4 | 114 km | 3 km |
| Jun 26, 2022 | 6 km E of Elgin, South Carolina | M3.4 | 44 km | 4 km |
| May 9, 2022 | 5 km ESE of Elgin, South Carolina | M3.3 | 43 km | 4 km |
| Aug 8, 1993 | 12 km ENE of Aiken, South Carolina | M3.2 | 67 km | 9 km |
| Jun 20, 2017 | 6 km SW of Augusta, Georgia | M3.2 | 107 km | 13 km |
| May 5, 2003 | 4 km NNW of Summerville, South Carolina | M3.1 | 149 km | 11 km |
| Aug 23, 2025 | 3 km N of Coronaca, South Carolina | M3.0 | 85 km | 2 km |
| Jul 26, 2002 | 4 km NNW of Summerville, South Carolina | M3.0 | 148 km | 10 km |
| Feb 16, 2014 | 13 km WNW of Edgefield, South Carolina | M3.0 | 86 km | 7 km |
| Mar 21, 2011 | 9 km S of Cordova, North Carolina | M2.9 | 149 km | 8 km |
| Feb 18, 2005 | 7 km ENE of Irmo, South Carolina | M2.9 | 8 km | 1 km |
| Jan 29, 1994 | 12 km NNE of Alcolu, South Carolina | M2.9 | 101 km | 2 km |
| Aug 23, 2025 | 3 km NNW of Coronaca, South Carolina | M2.9 | 87 km | 7 km |
| Sep 18, 1996 | 6 km E of Clarks Hill, South Carolina | M2.8 | 96 km | 14 km |
| Apr 26, 2013 | 9 km E of Lincolnton, Georgia | M2.8 | 115 km | 12 km |
| May 10, 2022 | 5 km E of Elgin, South Carolina | M2.8 | 44 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
15 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2022 | Ian | Category 1 | 86 mph | 205 km |
| 2020 | Isaias | Category 1 | 92 mph | 242 km |
| 2019 | Dorian | Category 3 | 115 mph | 264 km |
| 2018 | Florence | Category 1 | 75 mph | 258 km |
| 2016 | Matthew | Category 2 | 98 mph | 199 km |
| 2014 | Arthur | Category 1 | 92 mph | 300 km |
| 2004 | Charley | Category 1 | 81 mph | 207 km |
| 2004 | Gaston | Category 1 | 75 mph | 192 km |
| 1999 | Floyd | Category 2 | 104 mph | 295 km |
| 1999 | Irene | Category 1 | 81 mph | 294 km |
| 1996 | Fran | Category 3 | 115 mph | 259 km |
| 1996 | Bertha | Category 2 | 104 mph | 291 km |
| 1989 | Hugo | Category 4 | 138 mph | 67 km |
| 1985 | Bob | Category 1 | 75 mph | 221 km |
| 1984 | Diana | Category 3 | 127 mph | 267 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
474 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 30 fatalities, 555 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 28, 1984 | EF4 | 32 km | 21.0 mi | 5 |
| Mar 28, 1984 | EF4 | 71 km | 4.0 mi | 0 |
| Dec 13, 1973 | EF4 | 76 km | 1.0 mi | 2 |
| Apr 8, 1957 | EF4 | 82 km | 121.4 mi | 4 |
| Apr 13, 2020 | EF3 | 89 km | 35.7 mi | 2 |
| Apr 13, 2020 | EF3 | 97 km | 8.5 mi | 0 |
| Apr 13, 2020 | EF3 | 88 km | 1.4 mi | 0 |
| Apr 13, 2020 | EF3 | 100 km | 5.4 mi | 0 |
| Apr 10, 2009 | EF3 | 98 km | 14.6 mi | 0 |
| Mar 15, 2008 | EF3 | 54 km | 27.5 mi | 0 |
| Apr 15, 2007 | EF3 | 73 km | 19.0 mi | 1 |
| Dec 10, 2004 | EF3 | 68 km | 1.5 mi | 0 |
| Sep 7, 2004 | EF3 | 60 km | 7.0 mi | 0 |
| May 7, 1998 | EF3 | 94 km | 12.0 mi | 1 |
| May 7, 1998 | EF3 | 81 km | 5.0 mi | 0 |
| Nov 2, 1995 | EF3 | 33 km | 1.5 mi | 0 |
| Aug 16, 1994 | EF3 | 21 km | 0.3 mi | 0 |
| Aug 16, 1994 | EF3 | 19 km | 8.0 mi | 0 |
| Aug 16, 1994 | EF3 | 66 km | 30.0 mi | 0 |
| Mar 28, 1984 | EF3 | 32 km | 19.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (8,427 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | UNNAMED | 8,427 | 94 km |
| 2010 | BURNING UNIT | 5,567 | 69 km |
| 2009 | UNNAMED | 5,322 | 35 km |
| 2014 | UNNAMED | 3,897 | 98 km |
| 2019 | UNNAMED | 3,772 | 98 km |
| 2001 | UNNAMED | 3,481 | 76 km |
| 2010 | C-94-95 133 RX | 3,192 | 61 km |
| 1991 | UNNAMED | 3,094 | 94 km |
| 2010 | UNNAMED | 2,968 | 92 km |
| 2010 | UNNAMED | 2,909 | 58 km |
| 2021 | C-326/327 LC | 2,852 | 100 km |
| 2015 | UNNAMED | 2,690 | 53 km |
| 2013 | UNNAMED | 2,654 | 90 km |
| 2010 | UNNAMED | 2,532 | 99 km |
| 2017 | UNNAMED | 2,514 | 73 km |
| 2009 | UNNAMED | 2,458 | 52 km |
| 2017 | UNNAMED | 2,395 | 74 km |
| 2017 | UNNAMED | 2,362 | 69 km |
| 2010 | UNNAMED | 2,330 | 95 km |
| 2013 | UNNAMED | 2,274 | 52 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 4.6 in | Coldest |
| February | 47°F (8°C) | 3.7 in | |
| March | 54°F (12°C) | 4.7 in | |
| April | 62°F (17°C) | 2.9 in | Driest |
| May | 70°F (21°C) | 3.2 in | |
| June | 77°F (25°C) | 4.4 in | |
| July | 79°F (26°C) | 4.8 in | Warmest, Wettest |
| August | 79°F (26°C) | 4.7 in | |
| September | 74°F (23°C) | 3.9 in | |
| October | 63°F (17°C) | 3.3 in | |
| November | 55°F (13°C) | 3.0 in | |
| December | 47°F (8°C) | 3.4 in |
Irmo has a seasonal temperature swing of 38°F / from 42°F in January to 79°F in July. Total annual precipitation is 46.4 inches, with July being the wettest month (4.8") and April the driest (2.9").