Natural Disaster Risk in Sioux City
Iowa
Risk Summary for Sioux City
Sioux City scores 7.1/10 (High risk), above the U.S. average of 4.5. The leading hazard is Tornado.
Top Hazards
All 18 Hazard Scores
How it compares
Live Conditions
🏠 What this means for insurance
Above-average risk — check your policy limits
Standard homeowners insurance may not fully cover all hazards rated highly in this area. Verify that your policy includes adequate coverage for the top local hazards, and ask your insurer about specific endorsements or separate policies (e.g., flood, earthquake).
This is general information only. Consult a licensed insurance professional for advice specific to your property.
Natural Hazard Profile: Sioux City, Iowa
Sioux City, in Woodbury County, is a city of approximately 28,592 residents situated in the interior eastern United States. Its humid continental climate brings cold winters, hot summers, and frequent severe weather, and in particular a tornado-active spring season. These conditions collectively define the natural hazard environment that Sioux City residents and property owners must navigate.
According to FEMA's National Risk Index, Sioux City carries an overall risk score of 7.1/10, placing it in the high category. Tornado activity is the top natural hazard risk, with the region lying in a corridor where warm, moist air frequently clashes with dry, cool air masses to spawn severe supercell thunderstorms. The area also faces notable exposure to hail and drought.
Within Iowa, Sioux City's risk is, considerably above the 5.4/10 state average. Nationally, it ranks well above the U.S. national average of 4.5/10. FEMA's analysis of Woodbury County identifies tornado as the foremost hazard, followed by hail and drought. These rankings reflect the relative frequency and severity of each hazard type in the local environment.
Sioux City's high risk designation reflects meaningful exposure to natural hazards. Residents should verify that their insurance covers the area's primary risks, prepare a family emergency plan, and stay informed about seasonal hazard peaks through local weather and emergency management services.
What this means for Sioux City: Tornado preparedness
- Review whether your insurance covers wind and debris damage, and document belongings in advance.
- Identify the safest interior room on the lowest floor — away from windows — as your shelter.
- Enable Wireless Emergency Alerts on your phone and have a NOAA weather radio as a backup.
Local Factors for Sioux City
These city-level factors differentiate Sioux City from other communities in Woodbury County and provide geographic context for its hazard exposure.
Population
28,592
SuburbanGeographic Zone
Inland
Reduced coastal hazard exposure
Climate Band
Cool Continental
Latitude 42.5°
Flood Terrain
Minimal — county topography limits flood risk
Flood score: 1.0/10
Wildfire Exposure
Moderate — seasonal fire risk
Fire score: 8.9/10
Coordinates
42.4629° N, 96.3200° W
Woodbury County
Population and coordinates from SimpleMaps US Cities data. Hazard scores from FEMA National Risk Index. Geographic classification derived from coordinates.
Recent Climate Data for Sioux City
Last 12 months · Source: Open-Meteo archive
Notable Weather Days (last 12 months)
ZIP Codes in Sioux City
Other cities in Iowa
Data source: FEMA National Risk Index (NRI). Scores normalized to 1–10 across all US counties. City scores inherit county-level FEMA data. For informational purposes only.