DeKalb County weather alerts
There are no active weather alerts for DeKalb County, IL right now.
Since 2016 the National Weather Service has issued about 961 alerts that included DeKalb County, roughly 96 a year. The most common is the severe thunderstorm warning (152 from 2016 to 2025). The last tornado warning was issued on April 18, 2026. 30 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 DeKalb County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Kendall County, LaSalle County, Ogle County, McHenry County.
DeKalb County alert history
Alert events that included DeKalb County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 152 | 36 | August 21, 2026 |
| Dense Fog Advisory | 121 | 9 | September 10, 2026 |
| Flood Advisory | 100 | 13 | September 20, 2026 |
| Winter Weather Advisory | 100 | 2 | March 16, 2026 |
| Severe Thunderstorm Watch | 76 | 12 | August 21, 2026 |
| Wind Advisory | 64 | 6 | June 17, 2026 |
| Flood Watch | 52 | 13 | October 1, 2026 |
| Cold Weather Advisory | 36 | 3 | January 26, 2026 |
| Frost Advisory | 26 | 3 | May 7, 2026 |
| Flood Warning | 24 | 4 | July 4, 2026 |
| Tornado Warning | 24 | 2 | April 18, 2026 |
| Freeze Warning | 24 | 2 | October 17, 2026 |
| Tornado Watch | 23 | 5 | June 11, 2026 |
| Heat Advisory | 21 | 4 | September 4, 2026 |
| Flash Flood Warning | 20 | 4 | September 20, 2026 |
| Winter Storm Watch | 17 | 0 | November 29, 2025 |
| Winter Storm Warning | 16 | 0 | November 29, 2025 |
| High Wind Warning | 9 | 2 | April 27, 2026 |
| Freeze Watch | 9 | 1 | April 20, 2026 |
| Red Flag Warning | 8 | 1 | February 18, 2026 |
| Extreme Heat Watch | 6 | 0 | July 23, 2025 |
| Extreme Heat Warning | 6 | 2 | July 27, 2026 |
| Extreme Cold Warning | 6 | 1 | January 23, 2026 |
| Fire Weather Watch | 6 | 1 | February 18, 2026 |
| High Wind Watch | 5 | 0 | March 15, 2025 |
| Snow Squall Warning | 3 | 0 | February 19, 2022 |
| Ice Storm Warning | 2 | 0 | February 12, 2019 |
| Extreme Cold Watch | 2 | 1 | January 23, 2026 |
| Dust Storm Warning | 2 | 0 | May 16, 2025 |
| Blizzard Warning | 1 | 1 | March 16, 2026 |
Tornado history in DeKalb County
30 tornadoes have been recorded in DeKalb County since 1950, killing 2 people and injuring 12. That ranks 49 of 102 counties in Illinois. The most recent was on July 15, 2024 (rated unknown).
Strongest tornadoes in DeKalb County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 9, 2015 | EF4 | Lee County | 30.1 mi | 700 yd | 2 | 11 |
| August 15, 1958 | F2 | Lee County | 74.5 mi | 100 yd | 0 | 0 |
| June 18, 1975 | F2 | DeKalb County | 4.7 mi | 27 yd | 0 | 1 |
| April 9, 2015 | EF1 | DeKalb County | 4 mi | 100 yd | 0 | 0 |
| June 12, 2013 | EF1 | DeKalb County | 2.3 mi | 100 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| July 15, 2024 | ? | DeKalb County | 1.8 mi | 50 yd | 0 | 0 |
| July 14, 2024 | EF0 | Ogle County | 3.4 mi | 100 yd | 0 | 0 |
| February 27, 2024 | EF0 | DeKalb County | 5.4 mi | 175 yd | 0 | 0 |
| February 27, 2024 | ? | DeKalb County | 1.3 mi | 120 yd | 0 | 0 |
| July 28, 2023 | EF0 | DeKalb County | 0.8 mi | 20 yd | 0 | 0 |
About DeKalb County
- Population: 101,335 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017037 (how to use it)