Weather World
Tri-County, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Tri-County Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT |
 |  |  | | | | | | |  |  | |
| Mostly Clear | Mostly Sunny | Partly Cloudy | Sunny | Mostly Clear | Sunny | Clear | Sunny | Partly Cloudy | Partly Cloudy | Partly Sunny | Partly Cloudy |
| Lo: 29°FLo: -2°C | Hi: 51°FHi: 11°C | Lo: 35°FLo: 2°C | Hi: 61°FHi: 16°C | Lo: 35°FLo: 2°C | Hi: 65°FHi: 18°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C | Hi: 59°FHi: 15°C Lo: 39°FLo: 4°C | Hi: 59°FHi: 15°C Lo: 39°FLo: 4°C | Hi: 55°FHi: 13°C | Hi: 55°FHi: 13°C Lo: 35°FLo: 2°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 422 PM CST Fri Nov 06 2026 
Tri-County Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Tri-County Weather Map
Tri-County Quick Facts
Tri-County Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 500 PM CST Fri Nov 6 2026
Key Messages
- The first widespread freeze is expected (80-100% chance) across central and southeast IL by dawn Saturday morning.
- NBM has an 80-100% probability of lows below 32F over central IL overnight north of I-70, and greater than 50% chance southeast of I-70 getting below 32F late tonight.
Discussion
... Issued at 200 PM CST Fri Nov 6 2026
The early afternoon surface map shows a cold front pushing well se of IL into east TN, while 1023 mb Canadian high pressure extended from eastern KS across I...