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Clear Lake, Illinois Weather Forecast
Clear Lake, Illinois Weather
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Weather Forecast for Clear Lake, Illinois : Cass County
Issued: 3:46 am CST Dec 21, 2025 Latitude: 40.0506034 Longitude: -90.3090117 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Monday Tuesday Wednesday Christmas Day Friday Saturday
Sunny on Today Cloudy on Tonight Partly Sunny on Monday Sunny on Tuesday Cloudy on Wednesday Partly Sunny on Christmas Day Partly Sunny on Friday Partly Sunny on Saturday
High: 39°F Low: 27°F High: 47°F High: 54°F High: 60°F High: 67°F High: 51°F High: 51°F
Low: 39°F Low: 37°F Low: 51°F Low: 40°F Low: 33°F  
Sunny Cloudy Partly Sunny Sunny Cloudy Partly Sunny Partly Sunny Partly Sunny
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Current Conditions at
JACKSONVILLE MUNICIPAL - (KIJX)
25°
Clear
as of 4:15 AM CST
Rel. Humidity: 73%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.35 in.
Flight Rule: VFR
Wind Data
3 MPH
240° Southwest
Cloud Level(s): Clear
Current Conditions at
SPRINGFIELD - (KSPI)
28°
Clear
as of 3:52 AM CST
Rel. Humidity: 63%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.33 in.
Flight Rule: VFR
Wind Data
3 MPH
320° Northwest
Cloud Level(s): Clear
Current Conditions at
MACOMB MUNICIPAL AIRPORT - (KMQB)
23°
Clear
as of 4:15 AM CST
Rel. Humidity: 73%
Dew Point: 16°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: VFR
Wind Data
7 MPH
350° North
Cloud Level(s): Clear
Current Conditions at
QUINCY - (KUIN)
27°
Clear
as of 3:54 AM CST
Rel. Humidity: 63%
Dew Point: 16°F
Visibility: 10 Miles
Pressure: 30.34 in.
Flight Rule: VFR
Wind Data
3 MPH
330° Northwest
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 39. Calm wind becoming southeast around 5 mph in the afternoon.

Cloudy on Tonight Tonight... Partly cloudy, with a low around 27. South southeast wind 5 to 7 mph, with gusts as high as 20 mph.

Partly Sunny on Monday Monday... Partly sunny, with a high near 47. South wind 7 to 9 mph, with gusts as high as 18 mph.

Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 39. South southwest wind around 6 mph, with gusts as high as 15 mph.

Sunny on Tuesday Tuesday... Sunny, with a high near 54. West southwest wind around 5 mph becoming calm in the morning.

Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 37. Calm wind becoming east southeast around 5 mph after midnight.

Cloudy on Wednesday Wednesday... Cloudy, with a high near 60. South wind 5 to 7 mph, with gusts as high as 15 mph.

Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 51.

Partly Sunny on Christmas Day Christmas Day... Partly sunny, with a high near 67.

Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 40.

Partly Sunny on Friday Friday... Partly sunny, with a high near 51.

Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 33.

Partly Sunny on Saturday Saturday... Partly sunny, with a high near 51.

Current Radar Image


Sun Almanac for Clear Lake, Illinois
Sunrise: 07:20 AM
Sunset: 4:39 PM
Civil Sunrise:06:49 AM
Civil Sunset: 5:10 PM
Nautical Sunrise: 06:15 AM
Nautical Sunset: 5:44 PM
Astro Sunrise: 05:42 AM
Astro Sunset: 6:17 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.