Jefferson, IL Weather Forecast
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Jefferson Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
| Mostly Cloudy | Clearing | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Partly Cloudy | Showers Likely | Chance of Showers | Chance of Showers |
| Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C | Lo: 61°FLo: 16°C |
| POP: 60% | POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 516 AM CDT Fri Sep 25 2026 

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Issued: 642 AM CDT Fri Sep 25 2026
Key Messages
- Occasional sprinkles/light rain showers are expected in the area this morning.
- Near to slightly below normal temperatures are forecasted over the next several days.
- The next chance for a widespread, wetting rainfall won`t come until at least the middle of next week.
Discussion
... Issued at 215 AM CDT Fri Sep 25 2026
A pair of upper-level shortwaves is evident over the Midwest in GOES water vapor imagery loops early this morning, with one of these waves drifting eastward across northern...
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