Weather WorldLake Decatur, IL Weather Forecast
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Lake Decatur Weather Forecast
| REST OF TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  | | | | |  |  |  | |  |  |
| Mostly Clear | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Chance of T-Storm | Showers Likely | Mostly Cloudy | Chance of Showers | Partly Cloudy | Partly Cloudy |
| Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Hi: 85°FHi: 29°C Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C Lo: 65°FLo: 18°C |
| POP: 50% | POP: 60% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1237 AM CDT Mon Aug 03 2026 
Lake Decatur Radar Loop
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