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Green Castle, Illinois Weather Forecast
Green Castle, Illinois Weather
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Weather Forecast for Green Castle, Illinois : Madison County
Issued: 12:56 am CST Dec 21, 2025 Latitude: 38.88838 Longitude: -89.7450929 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Tuesday Wednesday Christmas Day Friday Saturday
Cloudy on Overnight Mostly Sunny on Sunday Partly Sunny on Monday Mostly Sunny on Tuesday Cloudy on Wednesday Sunny on Christmas Day Mostly Cloudy on Friday Mostly Cloudy on Saturday
Low: 25°F High: 42°F High: 49°F High: 61°F High: 63°F High: 71°F High: 64°F High: 55°F
Low: 28°F Low: 44°F Low: 40°F Low: 55°F Low: 51°F Low: 42°F  
Cloudy Mostly Sunny Partly Sunny Mostly Sunny Cloudy Sunny Mostly Cloudy Mostly Cloudy
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Current Conditions at
ALTON - (KALN)
34°
Clear
as of 1:15 AM CST
Rel. Humidity: 50%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.30 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
LITCHFIELD MUNI ARP - (K3LF)
28°
Feels like 19°F
Clear
as of 1:15 AM CST
Rel. Humidity: 74%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.29 in.
Flight Rule: VFR
Wind Data
9 MPH
340° North
Cloud Level(s): Clear
Current Conditions at
SCOTT AFB - (KBLV)
30°
Clear
as of 12:55 AM CST
Rel. Humidity: 63%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.28 in.
Flight Rule: VFR
Wind Data
5 MPH
010° North
Cloud Level(s): Clear
Current Conditions at
EAST ST LOUIS - (KCPS)
28°
Clear
as of 12:53 AM CST
Rel. Humidity: 68%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.29 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Cloudy on Overnight Overnight... Partly cloudy, with a low around 25. North wind 3 to 5 mph.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 42. Calm wind becoming northeast around 6 mph in the morning.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 28. Southeast wind 6 to 9 mph.
Partly Sunny on Monday Monday... Partly sunny, with a high near 49. South wind 8 to 11 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 44. South wind 6 to 10 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 61.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 40.
Cloudy on Wednesday Wednesday... Cloudy, with a high near 63.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 55.
Sunny on Christmas Day Christmas Day... Sunny, with a high near 71.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 51.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 64.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 42.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 55.
Current Radar Image


Sun Almanac for Green Castle, Illinois
Sunrise: 07:14 AM
Sunset: 4:40 PM
Civil Sunrise:06:44 AM
Civil Sunset: 5:10 PM
Nautical Sunrise: 06:11 AM
Nautical Sunset: 5:44 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:16 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.