Jefferson County, IL Weather Forecast
County weather hub
Mostly Sunny
Compare major city weather across Jefferson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly sunny, with a high near 90. Southeast wind around 2 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
- Aug 29 to Sep 3, 2026
- Latest sync
- Aug 28, 2026 1:22 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Jefferson County
Thursday looks like the warmest upcoming period in Jefferson County at 100 degrees F.
Saturday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Sunday at about 1 to 12 mph S.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Aug 28, 2026 1:22 PM CDT
- Coverage
- 6 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
Mostly clear, with a low around 65. Southeast wind around 3 mph.
Sunny, with a high near 95. South wind 1 to 12 mph.
Mostly clear, with a low around 71. South wind around 6 mph.
Sunny, with a high near 97. South southwest wind 3 to 10 mph.
Clear, with a low around 74. South wind 2 to 6 mph.
Sunny, with a high near 98. Southwest wind 2 to 8 mph.
Mostly clear, with a low around 76. South southwest wind around 5 mph.
Sunny, with a high near 99. Southwest wind 2 to 7 mph.
Mostly clear, with a low around 77. Southwest wind around 5 mph.
A slight chance of rain showers between 7am and 1pm. Sunny, with a high near 100. Southwest wind 2 to 7 mph.
Mostly clear, with a low around 76. South southwest wind around 3 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Mostly Sunny
|
90°F |
2 mph
SE
|
|
Saturday Night
Aug 29
|
Mostly Clear
|
65°F |
3 mph
SE
|
|
Sunday
Aug 30
|
Sunny
|
95°F |
1 to 12 mph
S
|
|
Sunday Night
Aug 30
|
Mostly Clear
|
71°F |
6 mph
S
|
|
Monday
Aug 31
|
Sunny
|
97°F |
3 to 10 mph
SSW
|
|
Monday Night
Aug 31
|
Clear
|
74°F |
2 to 6 mph
S
|
|
Tuesday
Sep 1
|
Sunny
|
98°F |
2 to 8 mph
SW
|
|
Tuesday Night
Sep 1
|
Mostly Clear
|
76°F |
5 mph
SSW
|
|
Wednesday
Sep 2
|
Sunny
|
99°F |
2 to 7 mph
SW
|
|
Wednesday Night
Sep 2
|
Mostly Clear
|
77°F |
5 mph
SW
|
|
Thursday
Sep 3
|
Slight Chance Rain Showers
|
100°F |
2 to 7 mph
SW
|
|
Thursday Night
Sep 3
|
Mostly Clear
|
76°F |
3 mph
SSW
|
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.
