Sioux County weather alerts
There are no active weather alerts for Sioux County, IA right now.
Since 2016 the National Weather Service has issued about 1,092 alerts that included Sioux County, roughly 109 a year. The most common is the severe thunderstorm warning (197 from 2016 to 2025). The last tornado warning was issued on September 2, 2026. 49 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Sioux County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring O'Brien County, Plymouth County, Union County, Lincoln County.
Sioux County alert history
Alert events that included Sioux County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 197 | 46 | October 9, 2026 |
| Dense Fog Advisory | 115 | 7 | September 30, 2026 |
| Flood Warning | 103 | 0 | July 31, 2025 |
| Winter Weather Advisory | 101 | 5 | March 7, 2026 |
| Wind Advisory | 91 | 3 | June 17, 2026 |
| Severe Thunderstorm Watch | 74 | 14 | September 2, 2026 |
| Red Flag Warning | 53 | 9 | May 14, 2026 |
| Heat Advisory | 48 | 7 | September 4, 2026 |
| Cold Weather Advisory | 45 | 3 | March 16, 2026 |
| Flash Flood Warning | 39 | 2 | October 9, 2026 |
| Winter Storm Watch | 33 | 1 | March 15, 2026 |
| Fire Weather Watch | 29 | 4 | April 16, 2026 |
| Tornado Warning | 20 | 1 | September 2, 2026 |
| Winter Storm Warning | 19 | 0 | December 6, 2025 |
| Flood Watch | 16 | 2 | September 6, 2026 |
| Blizzard Warning | 15 | 1 | March 15, 2026 |
| Frost Advisory | 15 | 4 | May 20, 2026 |
| Freeze Warning | 13 | 2 | October 17, 2026 |
| High Wind Warning | 13 | 3 | March 15, 2026 |
| Tornado Watch | 13 | 3 | June 10, 2026 |
| Extreme Heat Warning | 12 | 2 | July 25, 2026 |
| Extreme Cold Warning | 9 | 1 | January 23, 2026 |
| Extreme Heat Watch | 8 | 0 | July 27, 2025 |
| Extreme Cold Watch | 4 | 1 | January 23, 2026 |
| Freeze Watch | 3 | 1 | October 17, 2026 |
| High Wind Watch | 3 | 1 | March 13, 2026 |
| Ice Storm Warning | 1 | 0 | January 2, 2023 |
Tornado history in Sioux County
49 tornadoes have been recorded in Sioux County since 1950, injuring 1 people. That ranks 14 of 99 counties in Iowa. The most recent was on May 31, 2024 (rated EF0).
Strongest tornadoes in Sioux County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 5, 1978 | F3 | Sioux County | 8 mi | 100 yd | 0 | 0 |
| September 22, 1968 | F3 | Sioux County | 4.7 mi | 50 yd | 0 | 0 |
| May 1, 2008 | EF2 | Sioux County | 13 mi | 400 yd | 0 | 0 |
| July 5, 1978 | F2 | Sioux County | 11.9 mi | 200 yd | 0 | 0 |
| June 2, 1966 | F2 | Sioux County | 11.5 mi | 300 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 31, 2024 | EF0 | Sioux County | 0.7 mi | 25 yd | 0 | 0 |
| April 16, 2024 | EF0 | Sioux County | 0.3 mi | 25 yd | 0 | 0 |
| April 16, 2024 | EF0 | Sioux County | 0.9 mi | 25 yd | 0 | 0 |
| April 16, 2024 | ? | Sioux County | 0 mi | 10 yd | 0 | 0 |
| August 5, 2023 | ? | Sioux County | 0.1 mi | 10 yd | 0 | 0 |
About Sioux County
- Population: 36,554 (2024 estimate)
- State: Iowa
- NOAA Weather Radio SAME code: 019167 (how to use it)