Jefferson County, IL Weather Forecast
County weather hub
Sunny
Compare major city weather across Jefferson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny. High near 90, with temperatures falling to around 88 in the afternoon. Northeast wind 2 to 7 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
- Jul 14 to Jul 19, 2026
- Latest sync
- Jul 13, 2026 5:59 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Jefferson County
Saturday looks like the warmest upcoming period in Jefferson County at 94 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 70 degrees F.
The strongest winds are forecast for Saturday at about 3 to 9 mph W.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 13, 2026 5:59 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 70. Northeast wind 0 to 5 mph.
Sunny, with a high near 91. East northeast wind around 2 mph.
Mostly clear, with a low around 72. East northeast wind around 1 mph.
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 92. South southwest wind around 2 mph.
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 73. West wind around 1 mph.
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. West southwest wind 0 to 6 mph.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 74. West southwest wind around 3 mph.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. West wind 3 to 9 mph.
A slight chance of showers and thunderstorms. Mostly clear, with a low around 74. West wind 2 to 6 mph.
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Northwest wind 3 to 8 mph.
A slight chance of showers and thunderstorms before 1am. Mostly clear, with a low around 70. West southwest wind 2 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jul 14
|
Sunny
|
90°F |
2 to 7 mph
NE
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
70°F |
0 to 5 mph
NE
|
|
Wednesday
Jul 15
|
Sunny
|
91°F |
2 mph
ENE
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
72°F |
1 mph
ENE
|
|
Thursday
Jul 16
|
Sunny then Chance Showers And Thunderstorms
|
92°F |
2 mph
SSW
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms then Mostly Clear
|
73°F |
1 mph
W
|
|
Friday
Jul 17
|
Sunny then Chance Showers And Thunderstorms
|
93°F |
0 to 6 mph
WSW
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms then Partly Cloudy
|
74°F |
3 mph
WSW
|
|
Saturday
Jul 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
94°F |
3 to 9 mph
W
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms
|
74°F |
2 to 6 mph
W
|
|
Sunday
Jul 19
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
92°F |
3 to 8 mph
NW
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms
|
70°F |
2 to 7 mph
WSW
|
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.
