Illinois alerts

Saint Clair County, Illinois weather alerts

No watches, warnings or advisories are in force for Saint Clair County.

Checked Sun, Sep 20, 2026, 8:41 PM CDT. Times are Central Daylight Time.

Saint Clair County forecastLive radar here

Warnings on the map

Every watch, warning and advisory the National Weather Service has in force over Saint Clair County, Illinois. Open it for the live map, where it pans and zooms.

Every watch, warning and advisory the National Weather Service has in force over Saint Clair County, Illinois Open the live map with warnings and watches

Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.

Alerts in force

Nothing is in force for Saint Clair County right now. Its warnings come from the National Weather Service and appear here within a minute of being issued; every one of the past year is below.

The past year in Saint Clair County

In the past year the National Weather Service issued 96 alerts for Saint Clair County, including 14 severe thunderstorm warnings, 8 tornado warnings, 4 extreme heat warnings and 4 flash flood warnings.

ProductIssuedMost recent
Severe Thunderstorm Warning14Aug 16, 2026
Tornado Warning8Jun 21, 2026
Extreme Heat Warning4Sep 3, 2026
Flash Flood Warning4Jul 10, 2026
Freeze Warning2Mar 28, 2026
Extreme Cold Warning1Jan 26, 2026
Flood Warning1Apr 30, 2026
Red Flag Warning1Mar 29, 2026
Winter Storm Warning1Jan 24, 2026
Flood Watch6Aug 5, 2026
Severe Thunderstorm Watch6Jul 10, 2026
Tornado Watch6Jun 21, 2026
Extreme Heat Watch4Aug 31, 2026
Freeze Watch1Nov 2, 2025
Winter Storm Watch1Jan 24, 2026
Dense Fog Advisory10May 9, 2026
Flood Advisory8Sep 16, 2026
Heat Advisory6Sep 15, 2026
Wind Advisory6Jun 17, 2026
Cold Weather Advisory4Jan 26, 2026
Winter Weather Advisory2Dec 1, 2025

Warnings issued

  1. Extreme Heat Warning
  2. Severe Thunderstorm Warning
  3. Extreme Heat Warning
  4. Extreme Heat Warning
  5. Flash Flood Warning
  6. Flash Flood Warning
  7. Severe Thunderstorm Warning
  8. Severe Thunderstorm Warning
  9. Extreme Heat Warning
  10. Tornado Warning
  11. Flash Flood Warning
  12. Flash Flood Warning
  13. Severe Thunderstorm Warning
  14. Severe Thunderstorm Warning
  15. Flood Warning
  16. Severe Thunderstorm Warning
  17. Tornado Warning
  18. Severe Thunderstorm Warning
  19. Tornado Warning
  20. Severe Thunderstorm Warning
  21. Tornado Warning
  22. Severe Thunderstorm Warning
  23. Red Flag Warning
  24. Freeze Warning
  25. Tornado Warning
  26. Severe Thunderstorm Warning
  27. Tornado Warning
  28. Tornado Warning
  29. Severe Thunderstorm Warning
  30. Tornado Warning
  31. Severe Thunderstorm Warning
  32. Extreme Cold Warning
  33. Winter Storm Warning
  34. Severe Thunderstorm Warning
  35. Severe Thunderstorm Warning
  36. Freeze Warning
Every alert, most recent first
  1. Flood Advisory
  2. Heat Advisory
  3. Heat Advisory
  4. Extreme Heat Warning
  5. Extreme Heat Watch
  6. Heat Advisory
  7. Severe Thunderstorm Warning
  8. Extreme Heat Watch
  9. Extreme Heat Warning
  10. Flood Watch
  11. Flood Advisory
  12. Heat Advisory
  13. Extreme Heat Warning
  14. Extreme Heat Watch
  15. Heat Advisory
  16. Flash Flood Warning
  17. Flash Flood Warning
  18. Flood Advisory
  19. Severe Thunderstorm Warning
  20. Severe Thunderstorm Watch
  21. Severe Thunderstorm Warning
  22. Severe Thunderstorm Watch
  23. Extreme Heat Warning
  24. Extreme Heat Watch
  25. Flood Advisory
  26. Flood Watch
  27. Tornado Warning
  28. Tornado Watch
  29. Flood Watch
  30. Tornado Watch
  31. Wind Advisory
  32. Severe Thunderstorm Watch
  33. Heat Advisory
  34. Flood Watch
  35. Flood Advisory
  36. Flood Advisory
  37. Severe Thunderstorm Watch
  38. Flood Advisory
  39. Flash Flood Warning
  40. Flash Flood Warning

The 40 most recent of 96.

From the Iowa Environmental Mesonet’s archive of NWS watches, warnings and advisories (VTEC), by the county’s own code and the forecast zones inside it. Each date links to the event at the IEM.

Nearby

The counties around Saint Clair County, with what is in force in each.

What this means

Warning
The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
Watch
Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
Advisory
A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
Statement
Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.

Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.

Sources

Alerts from the National Weather Service's public feed, read afresh every minute, and matched to counties and zones by their UGC codes. Warnings from outside the United States come from each country's own meteorological service. Follow the issuing office's instructions and your local officials.