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City of Decatur, IllinoisDecatur, IL 7-Day Weather Forecast
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Decatur Weather Forecast
Decatur, IL Weather Forecast Date: 937 PM CDT Mon Oct 05 2026
Weather forecast for Decatur, IL
Tonight Lo: 49°F Lo: 9°C |
Tonight... Clear. Lows in the upper 40s. East winds around 5 mph. |
Tue Hi: 79°FHi: 26°C Lo: 55°F Lo: 13°C |
Tuesday... Sunny. Highs in the upper 70s. South winds 5 to 10 mph. |
| Wed Hi: 81°FHi: 27°C Lo: 50°F Lo: 10°C |
Wednesday... Sunny. Highs in the lower 80s. West winds 5 to 10 mph. |
| Thu Hi: 79°FHi: 26°C Lo: 50°F Lo: 10°C |
Thursday... Mostly clear. Highs in the upper 70s. Lows around 50. |
| Fri Hi: 79°FHi: 26°C Lo: 50°F Lo: 10°C |
Friday... Mostly clear. Highs in the upper 70s. Lows around 50. |
| Fri Hi: 79°FHi: 26°C Lo: 50°F Lo: 10°C |
Friday... Mostly clear. Highs in the upper 70s. Lows around 50. |
| Sat Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Saturday... Sunny. Highs in the lower 80s. |
Sun Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Sunday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Mon Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Monday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Tue Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Tuesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Wed Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Wednesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Thu Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Thursday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Fri Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Friday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
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