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Mackinaw Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  |  |  | |  |  | |  | |
| Cloudy | Partly Cloudy | Mostly Sunny | Mostly Cloudy | Partly Sunny | Mostly Clear | Mostly Clear | Chance of Showers | Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Hi: 71°FHi: 22°C Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C |
| POP: 40% | POP: 70% | POP: 50% | POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 637 AM CDT Fri Sep 25 2026 
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Issued: 459 AM CDT Fri Sep 25 2026
Key Messages
- Quiet through Midday Tuesday: Expect stable conditions across Central Illinois with highs in the upper 60s to mid-70s and only occasional sprinkles.
- Warming Trend Midweek: Temperatures and humidity will rise Wednesday and Thursday, pushing high temperatures near 80F.
- Heavy Rain Potential Wednesday-Friday: The primary weather hazard arrives Wednesday through Friday as a system bringing tropical moisture moves in. There is a 20-40% chance for rainfall to exceed 2 inches across our area...