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McLeansboro, IL Weather Forecast
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McLeansboro Weather Forecast
| THIS AFTERNOON | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY |
 |  |  |  | | | | |  | |  | |
| Chance of T-Storm | Chance of T-Storm | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Partly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C |
| POP: 20% | POP: 20% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 147 PM CDT Fri Sep 18 2026 
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Issued: 225 PM CDT Fri Sep 18 2026
Key Messages
- A Heat Advisory continues today through Sunday, with high temperatures 15 to 20 degrees above normal in the middle 90s to near 100 degrees.
- There is a 20-30% chance of showers and storms late this afternoon into this evening across mainly the northern half of the Quad State.
- A cooling trend will finally begin early next week with the passage of a cold front, with temperatures by mid week near to even a little below normal.
- The cold front will be accompanied by 40-60% chances of showe...