Monroe County weather alerts
There are no active weather alerts for Monroe County, IL right now.
Since 2016 the National Weather Service has issued about 787 alerts that included Monroe County, roughly 79 a year. The most common is the severe thunderstorm warning (178 from 2016 to 2025). The last tornado warning was issued on March 15, 2026. 39 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 Monroe County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring St. Clair County, St. Louis County, Ste. Genevieve County, Randolph County.
Monroe County alert history
Alert events that included Monroe County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 178 | 11 | September 21, 2026 |
| Severe Thunderstorm Watch | 72 | 7 | July 10, 2026 |
| Dense Fog Advisory | 68 | 4 | May 9, 2026 |
| Winter Weather Advisory | 59 | 0 | December 1, 2025 |
| Flood Watch | 46 | 7 | August 6, 2026 |
| Wind Advisory | 44 | 3 | June 17, 2026 |
| Flood Advisory | 40 | 4 | July 31, 2026 |
| Heat Advisory | 39 | 6 | September 15, 2026 |
| Tornado Watch | 39 | 6 | June 21, 2026 |
| Flash Flood Warning | 31 | 3 | July 11, 2026 |
| Freeze Warning | 26 | 2 | November 7, 2026 |
| Tornado Warning | 23 | 2 | March 15, 2026 |
| Flood Warning | 21 | 1 | April 30, 2026 |
| Frost Advisory | 20 | 1 | October 18, 2026 |
| Extreme Heat Warning | 13 | 4 | September 3, 2026 |
| Red Flag Warning | 12 | 1 | March 29, 2026 |
| Winter Storm Warning | 11 | 1 | January 24, 2026 |
| Winter Storm Watch | 11 | 1 | January 24, 2026 |
| Cold Weather Advisory | 10 | 3 | January 27, 2026 |
| Freeze Watch | 8 | 0 | November 2, 2025 |
| Extreme Heat Watch | 5 | 4 | August 31, 2026 |
| High Wind Warning | 3 | 0 | March 5, 2025 |
| Extreme Cold Watch | 2 | 0 | December 22, 2022 |
| Fire Weather Watch | 2 | 0 | October 17, 2020 |
| Extreme Cold Warning | 2 | 1 | January 26, 2026 |
| Ice Storm Warning | 1 | 0 | January 13, 2017 |
| High Wind Watch | 1 | 0 | March 14, 2019 |
Tornado history in Monroe County
39 tornadoes have been recorded in Monroe County since 1950, injuring 2 people. That ranks 32 of 102 counties in Illinois. The most recent was on April 20, 2025 (rated EF1).
Strongest tornadoes in Monroe County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 18, 1975 | F3 | Monroe County | 2 mi | 30 yd | 0 | 1 |
| March 29, 1960 | F2 | Randolph County | 22.3 mi | 130 yd | 0 | 0 |
| April 3, 1968 | F2 | Monroe County | 19.8 mi | 50 yd | 0 | 0 |
| May 21, 1957 | F2 | Monroe County | 19.7 mi | 150 yd | 0 | 0 |
| April 30, 2010 | EF2 | Monroe County | 7.2 mi | 350 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 20, 2025 | EF1 | Monroe County | 0.4 mi | 100 yd | 0 | 0 |
| April 20, 2025 | EF1 | Monroe County | 7.3 mi | 100 yd | 0 | 0 |
| March 14, 2025 | EF1 | Monroe County | 14.7 mi | 275 yd | 0 | 0 |
| August 13, 2023 | EF0 | Monroe County | 0.4 mi | 10 yd | 0 | 0 |
| April 15, 2023 | ? | Monroe County | 0.3 mi | 25 yd | 0 | 0 |
About Monroe County
- Population: 34,969 (2024 estimate)
- State: Illinois
- NOAA Weather Radio SAME code: 017133 (how to use it)