Jefferson County, IL Weather Forecast
County weather hub
Partly Cloudy then Slight 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 slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 72. South southwest wind 3 to 10 mph. Chance of precipitation is 20%.
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
- Oct 13 to Oct 20, 2026
- Latest sync
- Oct 13, 2026 8:07 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 86 degrees F.
Friday Night is the coolest period ahead with temperatures near 37 degrees F.
The strongest winds are forecast for Friday at about 18 to 24 mph NNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 13, 2026 8:07 PM CDT
- Coverage
- 8 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 7am, then showers and thunderstorms between 7am and 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. West wind 2 to 8 mph. Chance of precipitation is 90%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms between 7pm and 8pm, then a slight chance of showers and thunderstorms between 8pm and 9pm, then showers and thunderstorms likely. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. Northeast wind 0 to 5 mph. Chance of precipitation is 70%.
Showers and thunderstorms likely. Partly sunny, with a high near 86. South wind 1 to 13 mph. Chance of precipitation is 70%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 50. West wind 9 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.
A chance of rain showers before 7am. Mostly sunny, with a high near 63. North northwest wind 18 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 30%.
Mostly clear, with a low around 37. North wind 5 to 20 mph, with gusts as high as 23 mph.
Sunny, with a high near 63. Northeast wind around 6 mph.
Clear, with a low around 37. East southeast wind around 2 mph.
Sunny, with a high near 71. South southeast wind 1 to 8 mph.
Partly cloudy, with a low around 44. South wind around 5 mph.
Mostly sunny, with a high near 74. South wind 2 to 8 mph.
Partly cloudy, with a low around 49. Southeast wind 0 to 3 mph.
Mostly sunny, with a high near 79. South southeast wind 0 to 5 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
Oct 13
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
72°F |
3 to 10 mph
SSW
|
|
Wednesday
Oct 14
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
81°F |
2 to 8 mph
W
|
|
Wednesday Night
Oct 14
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
66°F |
0 to 5 mph
NE
|
|
Thursday
Oct 15
|
Showers And Thunderstorms Likely
|
86°F |
1 to 13 mph
S
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms Likely
|
50°F |
9 to 18 mph
W
|
|
Friday
Oct 16
|
Chance Rain Showers then Mostly Sunny
|
63°F |
18 to 24 mph
NNW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
37°F |
5 to 20 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
63°F |
6 mph
NE
|
|
Saturday Night
Oct 17
|
Clear
|
37°F |
2 mph
ESE
|
|
Sunday
Oct 18
|
Sunny
|
71°F |
1 to 8 mph
SSE
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
44°F |
5 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
74°F |
2 to 8 mph
S
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
49°F |
0 to 3 mph
SE
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
79°F |
0 to 5 mph
SSE
|
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.
