Jefferson, IL Weather Forecast

Feedback E-mail the Weather

Quick Weather Clicks

Jefferson, IL Weather Forecast

Current Conditions

Settings
Jefferson IL weather  - Overcast - 61°F
Overcast
61°F
Updated 6:57 am
Feels Like 58°F
Humidity 80%
Wind ENE 6 mph
Barometer  30.29 in
Dew Point 55°F
Jefferson IL weather  - Overcast - 16°C
Overcast
16°C
Updated 6:57 am
Feels Like 15°C
Humidity 80%
Wind ENE 10 km/h
Barometer  102.6 kPa
Dew Point 13°C

Jefferson Weather Forecast

TODAY TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT
Jefferson, IL Weather - Today Mostly Cloudy Jefferson, IL Weather - Tonight Clearing Jefferson, IL Weather - Saturday Partly Cloudy Jefferson, IL Weather - Saturday Night Partly Cloudy Jefferson, IL Weather - Sunday Partly Cloudy Jefferson, IL Weather - Sunday Night Partly Cloudy Jefferson, IL Weather - Monday Mostly Sunny Jefferson, IL Weather - Monday Night Mostly Clear Jefferson, IL Weather - Tuesday Partly Cloudy Jefferson, IL Weather - Tuesday Night Showers Likely Jefferson, IL Weather - Wednesday Chance Of Showers Jefferson, IL Weather - Wednesday Night Chance Of Showers
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 Jefferson, IL Weather - WeatherWorld.com

Trending Headlines

Jefferson Radar Loop

Use the map search tool if you want to place a location marker on the radar map...

Jefferson Quick Facts

National Two Day Weather Forecast


E-mail the Jefferson Weather Forecast

Voice your opinion or tell us about page issues...

Jefferson Forecast Discussion

Meteorlogic Glosserator
Instant definitions for any meteorological term.

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...