Tri-County, IL Weather Forecast
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Tri-County Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
| Drizzle | Chance of Rain | Chance of Rain | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Sunny | Clear | Sunny | Clear | Sunny |
| Lo: 45°FLo: 7°C | Hi: 55°FHi: 13°C | Lo: 39°FLo: 4°C | Hi: 49°FHi: 9°C | Lo: 29°FLo: -2°C | Hi: 51°FHi: 11°C Lo: 31°FLo: -1°C | Hi: 51°FHi: 11°C Lo: 31°FLo: -1°C | Hi: 59°FHi: 15°C | Lo: 35°FLo: 2°C | Hi: 61°FHi: 16°C | Lo: 39°FLo: 4°C | Hi: 61°FHi: 16°C |
| POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 422 PM CST Wed Nov 04 2026 

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Issued: 509 PM CST Wed Nov 4 2026
Key Messages
- Cool and breezy conditions will persist through Thursday with periods of light rain or drizzle.
- Near freezing temperatures will impact the region Friday night and Saturday night.
Discussion
... Issued at 115 PM CST Wed Nov 4 2026
Upper analysis early this afternoon shows an expansive trough/closed low located over the Upper Mississippi Valley. At the surface, a ~1000 mb occluded low is centered over northern Wisconsin with its trailing cold front stretched from the northern Great Lakes ...
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