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Weather & Climate in South Sioux City, NE
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South Sioux City experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 19°F in January while summers reach 75°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 30.3 inches. Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 1,100 feet.
Temperature
19°F Jan (-7°C)
75°F Jul (24°C)
| Annual Average | 48.0°F |
| 11% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,100 ft (335 m) |
| Area | 6.7 sq mi (17.4 km²) |
| Population Density | 2,064/sq mi |
| Coordinates | 42.4630°N, 96.4132°W |
| Timezone | America/Chicago |
| County | Dakota County County |
| Nearest Airport | Sioux Gateway/Brig General Bud Day Field (SUX) 5 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 36.0 / 100 |
| Social Vulnerability | 34.2 / 100 |
| Community Resilience | 8.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
6 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Feb 6, 1996 | 1 km N of Wausa, Nebraska | M3.6 | 93 km | 5 km |
| Aug 9, 1997 | 9 km NW of Clarkson, Nebraska | M3.4 | 98 km | 5 km |
| Jan 4, 2021 | 5 km N of Tyndall, South Dakota | M3.1 | 135 km | 5 km |
| Feb 5, 2025 | 8 km SSE of Tilden, Nebraska | M2.7 | 127 km | 5 km |
| Jun 30, 2021 | 4 km E of Rembrandt, Iowa | M2.7 | 114 km | 10 km |
| Mar 6, 2024 | 6 km SSE of Santee, Nebraska | M2.5 | 120 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
615 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 12 fatalities, 220 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 2014 | EF4 | 75 km | 11.5 mi | 1 |
| Jun 16, 2014 | EF4 | 82 km | 23.9 mi | 1 |
| Jun 16, 2014 | EF4 | 53 km | 15.8 mi | 0 |
| Jun 16, 2014 | EF4 | 99 km | 12.1 mi | 0 |
| Oct 4, 2013 | EF4 | 29 km | 24.7 mi | 0 |
| Oct 4, 2013 | EF4 | 66 km | 18.3 mi | 0 |
| Jun 23, 2003 | EF4 | 75 km | 13.0 mi | 1 |
| Jul 28, 1986 | EF4 | 52 km | 52.5 mi | 0 |
| Jul 7, 1977 | EF4 | 42 km | 22.6 mi | 0 |
| May 6, 1975 | EF4 | 100 km | 4.1 mi | 0 |
| Jun 23, 1952 | EF4 | 56 km | 24.1 mi | 0 |
| Jul 15, 1950 | EF4 | 75 km | 10.0 mi | 0 |
| Jun 17, 2014 | EF3 | 70 km | 4.0 mi | 0 |
| Apr 9, 2011 | EF3 | 93 km | 10.1 mi | 0 |
| Apr 9, 2011 | EF3 | 59 km | 3.4 mi | 0 |
| Jun 11, 2008 | EF3 | 78 km | 14.2 mi | 4 |
| Jul 5, 1994 | EF3 | 18 km | 1.8 mi | 0 |
| May 27, 1991 | EF3 | 65 km | 6.0 mi | 0 |
| May 8, 1979 | EF3 | 20 km | 0.1 mi | 0 |
| Jul 5, 1978 | EF3 | 80 km | 8.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 0.6 in | Coldest, Driest |
| February | 25°F (-4°C) | 0.6 in | |
| March | 37°F (3°C) | 2.0 in | |
| April | 50°F (10°C) | 2.8 in | |
| May | 61°F (16°C) | 3.8 in | Wettest |
| June | 71°F (22°C) | 3.8 in | |
| July | 75°F (24°C) | 3.3 in | Warmest |
| August | 73°F (23°C) | 2.9 in | |
| September | 64°F (18°C) | 2.7 in | |
| October | 52°F (11°C) | 2.1 in | |
| November | 35°F (2°C) | 1.4 in | |
| December | 23°F (-5°C) | 0.7 in |
South Sioux City has a seasonal temperature swing of 55°F / from 19°F in January to 75°F in July. Total annual precipitation is 26.6 inches, with May being the wettest month (3.8") and January the driest (0.6").