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City of Mattoon, IllinoisMattoon, IL Weather Forecast
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Mattoon Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  | | | |  |  |  |  | | |
| Clearing | Sunny | Clear | Sunny | Partly Cloudy | Mostly Sunny | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 80°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 55°FLo: 13°C |
| POP: 40% | POP: 50% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 712 PM CDT Tue Oct 27 2026 
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Issued: 655 PM CDT Tue Oct 27 2026
Key Messages
- Well above normal temperatures persist through Friday, with highs climbing to the mid 70s to around 80 degrees, around 15 degrees above normal.
- Scattered light showers are possible Thursday through Saturday along a weak frontal boundary, but rain amounts will be light and localized.
- A pronounced pattern shift this weekend through early next week brings high confidence in more widespread rainfall and cooler temperatures.
Discussion
... Issued at 1223 PM CDT Tue Oct 27 2026
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