Marion, IL Weather Forecast
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Marion Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | MONDAY NIGHT | TUESDAY |
| Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers |
| Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1107 PM CDT Tue Sep 22 2026 

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Instant definitions for any meteorological term.
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Issued: 1036 PM CDT Tue Sep 22 2026
Key Messages
- Low clouds are keeping temperatures even cooler than expected today. Some locations may not reach 70 degrees. The clouds and cooler air could linger through tomorrow as well.
- Heading into the weekend, temperatures will linger just below normal levels. Readings will eventually trend warmer early next week.
Discussion
... Issued at 1205 PM CDT Tue Sep 22 2026
Well we are really doubling down on the cooler air today, as low clouds persist across most of the region. There is a small break o...
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