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Weather & Climate in Johnsonville, SC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Johnsonville enjoys a temperate climate with an average annual temperature of 64°F (18°C). Winters average 46°F in January while summers reach 81°F in July. The area gets 304 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 50.7 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 84 feet.
Temperature
46°F Jan (8°C)
81°F Jul (27°C)
| Annual Average | 63.5°F |
| 18% above US avg | |
| January Average | 46°F (8°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 304 days/yr |
Geography
| Elevation | 84 ft (26 m) |
| Area | 2.1 sq mi (5.3 km²) |
| Population Density | 501/sq mi |
| Coordinates | 33.8142°N, 79.4443°W |
| Timezone | America/New_York |
| County | Williamsburg County County |
| Nearest Airport | Florence Regional (FLO) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 82.1 / 100 |
| Social Vulnerability | 90.6 / 100 |
| Community Resilience | 21.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
46 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.
| Aug 21, 1992 | 1 km SSE of Centerville, South Carolina | M4.1 | 114 km | 7 km |
| Apr 17, 1995 | 0 km NNW of Centerville, South Carolina | M3.9 | 113 km | 8 km |
| Apr 13, 1998 | 9 km S of Kershaw, South Carolina | M3.9 | 129 km | 7 km |
| Jun 29, 2022 | 6 km E of Elgin, South Carolina | M3.6 | 125 km | 3 km |
| Nov 13, 1990 | 4 km SSW of Ladson, South Carolina | M3.5 | 116 km | 3 km |
| Jun 29, 2022 | 6 km E of Elgin, South Carolina | M3.5 | 125 km | 3 km |
| Jun 26, 2022 | 6 km E of Elgin, South Carolina | M3.4 | 124 km | 4 km |
| May 9, 2022 | 5 km ESE of Elgin, South Carolina | M3.3 | 125 km | 4 km |
| Aug 29, 2009 | 2 km NE of Summerville, South Carolina | M3.2 | 109 km | 5 km |
| May 5, 2003 | 4 km NNW of Summerville, South Carolina | M3.1 | 109 km | 11 km |
| Jul 20, 2004 | 7 km WSW of Centerville, South Carolina | M3.1 | 120 km | 10 km |
| Mar 19, 2014 | 0 km WNW of Centerville, South Carolina | M3.0 | 114 km | 7 km |
| Mar 29, 1999 | 3 km NNW of Sangaree, South Carolina | M3.0 | 106 km | 11 km |
| Jul 26, 2002 | 4 km NNW of Summerville, South Carolina | M3.0 | 109 km | 10 km |
| Mar 2, 2003 | 7 km S of Centerville, South Carolina | M2.9 | 119 km | 7 km |
| Feb 7, 1990 | 9 km S of Centerville, South Carolina | M2.9 | 121 km | 9 km |
| Jan 29, 1994 | 12 km NNE of Alcolu, South Carolina | M2.9 | 65 km | 2 km |
| Jul 7, 2002 | 1 km NW of Sangaree, South Carolina | M2.9 | 107 km | 11 km |
| Mar 21, 2011 | 9 km S of Cordova, North Carolina | M2.9 | 118 km | 8 km |
| Jul 16, 2002 | 5 km SSW of Ladson, South Carolina | M2.8 | 117 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
21 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 | 62 km |
| 2020 | Isaias | Category 1 | 92 mph | 87 km |
| 2019 | Dorian | Category 3 | 115 mph | 126 km |
| 2018 | Florence | Category 2 | 104 mph | 99 km |
| 2016 | Matthew | Category 2 | 98 mph | 54 km |
| 2014 | Arthur | Category 2 | 98 mph | 147 km |
| 2011 | Irene | Category 1 | 86 mph | 249 km |
| 2005 | Ophelia | Category 1 | 86 mph | 164 km |
| 2004 | Alex | Category 2 | 98 mph | 197 km |
| 2004 | Charley | Category 1 | 81 mph | 56 km |
| 2004 | Gaston | Category 1 | 75 mph | 92 km |
| 1999 | Irene | Category 2 | 92 mph | 155 km |
| 1999 | Floyd | Category 2 | 104 mph | 134 km |
| 1999 | Dennis | Category 2 | 104 mph | 205 km |
| 1998 | Bonnie | Category 3 | 115 mph | 159 km |
| 1996 | Fran | Category 3 | 115 mph | 134 km |
| 1996 | Bertha | Category 2 | 104 mph | 127 km |
| 1989 | Hugo | Category 4 | 138 mph | 87 km |
| 1986 | Charley | Category 1 | 75 mph | 270 km |
| 1985 | Bob | Category 1 | 75 mph | 205 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
373 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 29 fatalities, 1,031 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 7, 1995 | EF4 | 38 km | 0.7 mi | 0 |
| Mar 28, 1984 | EF4 | 96 km | 7.0 mi | 0 |
| Mar 28, 1984 | EF4 | 92 km | 40.0 mi | 4 |
| Mar 28, 1984 | EF4 | 97 km | 17.0 mi | 7 |
| Apr 8, 1957 | EF4 | 99 km | 0.8 mi | 0 |
| Feb 15, 2021 | EF3 | 87 km | 21.9 mi | 3 |
| Apr 13, 2020 | EF3 | 87 km | 5.7 mi | 0 |
| Apr 15, 2007 | EF3 | 98 km | 19.0 mi | 1 |
| May 20, 1980 | EF3 | 63 km | 10.7 mi | 0 |
| Apr 18, 1969 | EF3 | 92 km | 77.3 mi | 0 |
| Nov 24, 1967 | EF3 | 24 km | 3.3 mi | 0 |
| Aug 17, 1965 | EF3 | 72 km | 0.3 mi | 0 |
| Oct 9, 1950 | EF3 | 87 km | 2.0 mi | 0 |
| Apr 5, 2022 | EF2 | 74 km | 2.8 mi | 0 |
| Apr 13, 2020 | EF2 | 49 km | 4.6 mi | 0 |
| Sep 5, 2019 | EF2 | 89 km | 9.3 mi | 0 |
| Apr 19, 2019 | EF2 | 79 km | 2.9 mi | 0 |
| Apr 25, 2010 | EF2 | 74 km | 0.6 mi | 0 |
| Apr 25, 2010 | EF2 | 67 km | 3.0 mi | 0 |
| Nov 14, 2008 | EF2 | 66 km | 1.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1886 | CHARLESTON, SC | Earthquake | - | - | 114 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HIGHWAY 31 (17,004 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | HIGHWAY 31 | 17,004 | 55 km |
| 2004 | UNNAMED | 13,429 | 83 km |
| 2005 | UNNAMED | 11,023 | 83 km |
| 2005 | UNNAMED | 8,560 | 79 km |
| 2009 | UNNAMED | 8,439 | 79 km |
| 1997 | MURRELL | 5,126 | 80 km |
| 2017 | UNNAMED | 4,893 | 75 km |
| 2014 | UNNAMED | 4,890 | 66 km |
| 2008 | UNNAMED | 4,852 | 87 km |
| 2017 | UNNAMED | 4,813 | 79 km |
| 2016 | UNNAMED | 4,336 | 77 km |
| 2008 | UNNAMED | 3,955 | 81 km |
| 2010 | UNNAMED | 3,759 | 70 km |
| 2003 | LITTLE HELLHOLE | 3,724 | 81 km |
| 2009 | UNNAMED | 3,641 | 79 km |
| 2001 | UNNAMED | 3,481 | 95 km |
| 2015 | UNNAMED | 3,367 | 67 km |
| 2017 | UNNAMED | 3,217 | 71 km |
| 1997 | UNNAMED | 3,111 | 27 km |
| 2008 | UNNAMED | 3,104 | 83 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 46°F (8°C) | 4.2 in | Coldest |
| February | 48°F (9°C) | 3.6 in | |
| March | 56°F (13°C) | 4.2 in | |
| April | 63°F (17°C) | 2.9 in | |
| May | 70°F (21°C) | 4.0 in | |
| June | 77°F (25°C) | 5.0 in | |
| July | 81°F (27°C) | 6.0 in | Warmest |
| August | 79°F (26°C) | 6.1 in | Wettest |
| September | 74°F (24°C) | 4.7 in | |
| October | 64°F (18°C) | 3.4 in | |
| November | 56°F (13°C) | 2.8 in | Driest |
| December | 49°F (9°C) | 3.5 in |
Johnsonville has a seasonal temperature swing of 34°F / from 46°F in January to 81°F in July. Total annual precipitation is 50.2 inches, with August being the wettest month (6.1") and November the driest (2.8").