Clark County, IL Weather Forecast
County weather hub
Showers And Thunderstorms
Compare major city weather across Clark County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Showers and thunderstorms. Mostly cloudy, with a high near 78. South southwest wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
County Weather Overview
This county weather page brings together forecast coverage for Clark County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 2 of 2 mapped cities in Clark County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 15 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 5:32 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Clark County
This Afternoon looks like the warmest upcoming period in Clark County at 78 degrees F.
Saturday Night is the coolest period ahead with temperatures near 34 degrees F.
The strongest winds are forecast for Tonight at about 12 to 20 mph WSW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 15, 2026 5:32 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KVWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 9pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 49. West southwest wind 12 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Partly sunny, with a high near 56. Northwest wind around 20 mph, with gusts as high as 31 mph. New rainfall amounts less than a tenth of an inch possible.
Partly cloudy, with a low around 39. North northwest wind 12 to 18 mph, with gusts as high as 29 mph.
Sunny, with a high near 59. North northeast wind 5 to 10 mph, with gusts as high as 17 mph.
Areas of frost after 3am. Clear, with a low around 34. East wind around 3 mph.
Widespread frost before 8am. Sunny, with a high near 66. South southeast wind 3 to 8 mph.
Mostly clear, with a low around 38.
Sunny, with a high near 70.
Partly cloudy, with a low around 43.
Mostly sunny, with a high near 75.
Mostly clear, with a low around 45.
Sunny, with a high near 76.
Mostly clear, with a low around 46.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Oct 15
|
Showers And Thunderstorms
|
78°F |
10 mph
SSW
|
|
Tonight
Oct 15
|
Showers And Thunderstorms Likely
|
49°F |
12 to 20 mph
WSW
|
|
Friday
Oct 16
|
Partly Sunny
|
56°F |
20 mph
NW
|
|
Friday Night
Oct 16
|
Partly Cloudy
|
39°F |
12 to 18 mph
NNW
|
|
Saturday
Oct 17
|
Sunny
|
59°F |
5 to 10 mph
NNE
|
|
Saturday Night
Oct 17
|
Clear then Areas Of Frost
|
34°F |
3 mph
E
|
|
Sunday
Oct 18
|
Widespread Frost then Sunny
|
66°F |
3 to 8 mph
SSE
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
38°F |
5 mph
SSE
|
|
Monday
Oct 19
|
Sunny
|
70°F |
2 to 6 mph
S
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
43°F |
2 mph
SE
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
75°F |
1 to 5 mph
ESE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
45°F |
3 mph
ENE
|
|
Wednesday
Oct 21
|
Sunny
|
76°F |
5 mph
E
|
|
Wednesday Night
Oct 21
|
Mostly Clear
|
46°F |
3 mph
ESE
|
Major City Forecasts
Live forecast snapshots for major cities across Clark County.
Coverage
Forecast coverage currently spans 2 of 2 mapped cities in Clark County.
Largest mapped city population in this region: 3,774.
