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Jefferson, IL 7-Day Weather Forecast
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Jefferson Weather Forecast
Jefferson, IL Weather Forecast Date: 705 PM CDT Sun Sep 20 2026
Weather forecast for Jefferson, IL
Tonight Lo: 59°F Lo: 15°C |
Tonight... Cloudy. Areas of drizzle and a slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 50s. Northeast winds 15 to 20 mph, diminishing to 10 to 15 mph after midnight. Chance of precipitation 40%. |
| Mon Hi: 65°FHi: 18°C Lo: 55°F Lo: 13°C |
Monday... Cloudy. A slight chance of showers in the morning. Highs in the mid 60s. Northeast winds 15 to 20 mph, diminishing to 10 to 15 mph in the afternoon. Chance of precipitation 20%. |
Tue Hi: 65°FHi: 18°C Lo: 55°F Lo: 13°C |
Tuesday... Mostly cloudy. Highs in the mid 60s. Northeast winds 10 to 15 mph. Gusts up to 25 mph in the afternoon. |
| Wed Hi: 65°FHi: 18°C Lo: 55°F Lo: 13°C |
Wednesday... Mostly cloudy. Highs in the mid 60s. |
Thu Hi: 65°FHi: 18°C Lo: 55°F Lo: 13°C |
Thursday... Partly cloudy in the morning, then becoming mostly cloudy. Highs in the mid 60s. |
| Fri Hi: 69°FHi: 21°C Lo: 55°F Lo: 13°C |
Friday... Mostly cloudy. Highs in the upper 60s. |
| Sat Hi: 71°FHi: 22°C Lo: 59°F Lo: 15°C |
Saturday... Mostly cloudy. Highs in the lower 70s. |
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