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Denison, IL Weather Forecast
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Denison Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
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| Patchy Fog | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Sunny | Chance of Showers | Chance of Showers |
| Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C |
| POP: 20% | POP: 30% | POP: 50% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 222 AM CDT Fri Sep 11 2026 
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Issued: 209 AM CDT Fri Sep 11 2026
Key Messages
- Dense fog will reduce visibility to a quarter mile or less across portions of central Illinois through mid-morning. Drive with caution and allow extra stopping distance.
- Isolated showers and possibly a brief funnel cloud or two are possible this afternoon and evening south of I-72, but the overall severe storm threat is very low.
- Summerlike heat returns this weekend with highs approaching 90 degrees in parts of central Illinois, followed by periodic chances for thunderstorms next wee...