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Jefferson County, IL 7-Day Weather Forecast
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Jefferson County Weather Forecast
Jefferson County, IL Weather Forecast Date: 207 AM CDT Thu Oct 08 2026
Weather forecast for Jefferson County, IL
Tonight Lo: 55°F Lo: 13°C |
Tonight... Clear. Lows in the mid 50s. Northeast winds around 5 mph. |
Thu Hi: 85°FHi: 29°C Lo: 55°F Lo: 13°C |
Thursday... Sunny. Highs in the mid 80s. East winds around 5 mph. |
| Fri Hi: 89°FHi: 32°C Lo: 59°F Lo: 15°C |
Friday... Sunny. Highs in the upper 80s. Southeast winds 5 to 10 mph. |
Sat Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Saturday... Mostly sunny in the morning, then mostly cloudy with a chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 40%. |
| Sun Hi: 75°FHi: 24°C Lo: 59°F Lo: 15°C |
Sunday... Mostly cloudy with a chance of showers in the morning, then partly sunny in the afternoon. Highs in the mid 70s. Chance of rain 50%. |
| Mon Hi: 85°FHi: 29°C Lo: 59°F Lo: 15°C |
Monday... Mostly clear. Lows in the upper 50s. Highs in the mid 80s. |
| Mon Hi: 85°FHi: 29°C Lo: 59°F Lo: 15°C |
Monday... Mostly clear. Lows in the upper 50s. Highs in the mid 80s. |
| Tue Hi: 79°FHi: 26°C Lo: 51°F Lo: 11°C |
Tuesday... Mostly clear. Highs in the upper 70s. Lows in the lower 50s. |
| Wed Hi: 79°FHi: 26°C Lo: 51°F Lo: 11°C |
Wednesday... Mostly clear. Highs in the upper 70s. Lows in the lower 50s. |
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