Clinton County, IL Weather Forecast
County weather hub
Sunny
Compare major city weather across Clinton County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 88. South wind 8 to 18 mph.
County Weather Overview
This county weather page brings together forecast coverage for Clinton County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 4 of 4 mapped cities in Clinton County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 17 to May 23, 2026
- Latest sync
- May 17, 2026 8:38 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Clinton County
Today looks like the warmest upcoming period in Clinton County at 88 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 53 degrees F.
The strongest winds are forecast for Monday at about 15 to 21 mph S.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- May 17, 2026 8:38 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
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 72. South wind 13 to 16 mph, with gusts as high as 24 mph.
A slight chance of rain showers between 9am and 10am, then a chance of showers and thunderstorms between 10am and 11am, then a slight chance of showers and thunderstorms between 11am and noon, then a chance of showers and thunderstorms between noon and 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 87. South wind 15 to 21 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 71. South wind around 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Showers and thunderstorms after 7am. Partly sunny. High near 86, with temperatures falling to around 82 in the afternoon. Southwest wind 10 to 17 mph. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 90%.
Showers and thunderstorms likely before 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
A slight chance of rain showers between 7pm and 1am. Mostly cloudy, with a low around 53. Chance of precipitation is 20%.
Partly sunny, with a high near 72.
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 56. Chance of precipitation is 20%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 75. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 30%.
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
May 17
|
Sunny
|
88°F |
8 to 18 mph
S
|
|
Tonight
May 17
|
Mostly Clear
|
72°F |
13 to 16 mph
S
|
|
Monday
May 18
|
Chance Showers And Thunderstorms
|
87°F |
15 to 21 mph
S
|
|
Monday Night
May 18
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
71°F |
16 mph
S
|
|
Tuesday
May 19
|
Showers And Thunderstorms
|
86°F |
10 to 17 mph
SW
|
|
Tuesday Night
May 19
|
Showers And Thunderstorms
|
60°F |
6 to 9 mph
NW
|
|
Wednesday
May 20
|
Showers And Thunderstorms Likely
|
71°F |
10 mph
N
|
|
Wednesday Night
May 20
|
Slight Chance Rain Showers
|
53°F |
6 to 9 mph
NE
|
|
Thursday
May 21
|
Partly Sunny
|
72°F |
9 mph
NE
|
|
Thursday Night
May 21
|
Mostly Cloudy then Slight Chance Rain Showers
|
56°F |
7 mph
NE
|
|
Friday
May 22
|
Chance Rain Showers
|
75°F |
7 mph
E
|
|
Friday Night
May 22
|
Chance Showers And Thunderstorms
|
60°F |
3 to 7 mph
NE
|
|
Saturday
May 23
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
81°F |
6 mph
E
|
|
Saturday Night
May 23
|
Slight Chance Showers And Thunderstorms
|
63°F |
5 mph
SE
|
Major City Forecasts
Live forecast snapshots for major cities across Clinton County.
Coverage
Forecast coverage currently spans 4 of 4 mapped cities in Clinton County.
Largest mapped city population in this region: 4,538.
