Cass County, IL Weather Forecast
County weather hub
Patchy Fog
Compare major city weather across Cass County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Patchy fog. Mostly clear, with a low around 55. Wind around 0 mph.
County Weather Overview
This county weather page brings together forecast coverage for Cass 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 Cass County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 24 to Aug 30, 2026
- Latest sync
- Aug 24, 2026 5:41 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Cass County
Sunday looks like the warmest upcoming period in Cass County at 88 degrees F.
Overnight is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Sunday at about 10 mph SSW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 24, 2026 5:41 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Patchy fog before 8am. Sunny, with a high near 80. Northeast wind around 2 mph.
Mostly clear, with a low around 59. East wind around 3 mph.
Mostly sunny, with a high near 83. Southeast wind around 5 mph.
Partly cloudy, with a low around 65. South southeast wind around 3 mph.
A slight chance of rain showers between 7am and 4pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Southwest wind 3 to 9 mph.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 63. West wind 1 to 6 mph.
Sunny, with a high near 84.
Clear, with a low around 61.
Sunny, with a high near 84.
Mostly clear, with a low around 64.
A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86.
A slight chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 88.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Aug 24
|
Patchy Fog
|
55°F |
0 mph
|
|
Monday
Aug 24
|
Patchy Fog then Sunny
|
80°F |
2 mph
NE
|
|
Monday Night
Aug 24
|
Mostly Clear
|
59°F |
3 mph
E
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
83°F |
5 mph
SE
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
65°F |
3 mph
SSE
|
|
Wednesday
Aug 26
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
86°F |
3 to 9 mph
SW
|
|
Wednesday Night
Aug 26
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
63°F |
1 to 6 mph
W
|
|
Thursday
Aug 27
|
Sunny
|
84°F |
2 to 8 mph
NW
|
|
Thursday Night
Aug 27
|
Clear
|
61°F |
0 to 6 mph
N
|
|
Friday
Aug 28
|
Sunny
|
84°F |
2 mph
NNE
|
|
Friday Night
Aug 28
|
Mostly Clear
|
64°F |
5 mph
ESE
|
|
Saturday
Aug 29
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
5 to 9 mph
S
|
|
Saturday Night
Aug 29
|
Slight Chance Showers And Thunderstorms
|
69°F |
9 mph
S
|
|
Sunday
Aug 30
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
88°F |
10 mph
SSW
|
Major City Forecasts
Live forecast snapshots for major cities across Cass County.
Coverage
Forecast coverage currently spans 2 of 2 mapped cities in Cass County.
Largest mapped city population in this region: 5,335.
