Jefferson County, IL Weather Forecast
County weather hub
Chance Rain Showers then Chance Showers And Thunderstorms
Compare major city weather across Jefferson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 77. East northeast wind 6 to 9 mph.
County Weather Overview
This county weather page brings together forecast coverage for Jefferson County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 1 of 1 mapped cities in Jefferson County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 30 to May 31, 2026
- Latest sync
- May 24, 2026 10:18 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Jefferson County
Sunday looks like the warmest upcoming period in Jefferson County at 78 degrees F.
Saturday Night is the coolest period ahead with temperatures near 61 degrees F.
The strongest winds are forecast for Sunday at about 6 to 10 mph NE.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 10:18 PM CDT
- Coverage
- 2 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KVWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 61. East northeast wind 5 to 8 mph.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. Northeast wind 6 to 10 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
May 30
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
77°F |
6 to 9 mph
ENE
|
|
Saturday Night
May 30
|
Chance Showers And Thunderstorms
|
61°F |
5 to 8 mph
ENE
|
|
Sunday
May 31
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
78°F |
6 to 10 mph
NE
|
Major City Forecasts
Live forecast snapshots for major cities across Jefferson County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Jefferson County.
Largest mapped city population in this region: 14,511.
