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Newcastle, Illinois Weather Forecast
Newcastle, Illinois Weather
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Weather Forecast for Newcastle, Illinois : Saline County
Issued: 6:21 pm CST Dec 11, 2025 Latitude: 37.650605 Longitude: -88.6714452 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
20% chance of rain & snow on Tonight Partly Sunny on Friday Mostly Cloudy on Saturday Sunny on Sunday Sunny on Monday Mostly Sunny on Tuesday Mostly Cloudy on Wednesday 20% chance of on Thursday
Low: 36°F High: 43°F High: 35°F High: 17°F High: 33°F High: 46°F High: 53°F High: 57°F
Low: 26°F Low: 7 °F Low: 5 °F Low: 23°F Low: 36°F Low: 45°F  
Rain & Snow Partly Sunny Mostly Cloudy Sunny Sunny Mostly Sunny Mostly Cloudy Partly Sunny
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Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
37°
Cloudy
as of 6:55 PM CST
Rel. Humidity: 69%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
8 MPH
110° East
Cloud Level(s): Solid Overcast at 7000ft
Current Conditions at
MARION - (KMWA)
37°
Feels like 29°F
Cloudy
as of 6:47 PM CST
Rel. Humidity: 69%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
12 MPH
110° East
Cloud Level(s): Broken at 7500ft, Solid Overcast at 9000ft
Current Conditions at
METROPOLIS MUNI ARP - (KM30)
39°
Cloudy
as of 6:55 PM CST
Rel. Humidity: 64%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 7500ft, Solid Overcast at 9500ft
Current Conditions at
CARBONDALE - (KMDH)
37°
Feels like 30°F
Cloudy
as of 6:52 PM CST
Rel. Humidity: 69%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
9 MPH
110° East
Cloud Level(s): Broken at 9000ft, Solid Overcast at 11000ft
20% chance of rain & snow Tonight Tonight... A slight chance of rain before 9pm, then a slight chance of snow between 9pm and 10pm. Mostly cloudy, with a steady temperature around 36. Southeast wind 5 to 7 mph becoming west southwest after midnight. Chance of precipitation is 20%.
Partly Sunny on Friday Friday... Partly sunny, with a high near 43. West wind 5 to 10 mph becoming north northwest in the morning.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 26. Northwest wind around 5 mph becoming calm in the evening.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 35. Calm wind becoming north 5 to 8 mph in the morning.
Mostly Cloudy on Saturday Night Saturday Night... Mostly cloudy, with a low around 7. North wind 8 to 10 mph, with gusts as high as 21 mph.
Sunny on Sunday Sunday... Sunny, with a high near 17. North northwest wind 5 to 10 mph, with gusts as high as 21 mph.
Clear on Sunday Night Sunday Night... Clear, with a low around 5. Light and variable wind.
Sunny on Monday Monday... Sunny, with a high near 33. Light south southeast wind becoming south southwest 6 to 11 mph in the morning.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 23. South southwest wind around 6 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 46. South southwest wind 5 to 10 mph.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 36. South southwest wind around 8 mph.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 53. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.
20% chance of rain Wednesday Night Wednesday Night... A chance of showers. Mostly cloudy, with a low around 45. South southwest wind around 9 mph, with gusts as high as 20 mph.
20% chance of Thursday Thursday... A chance of showers. Partly sunny, with a high near 57. West wind 7 to 10 mph, with gusts as high as 20 mph.
Current Radar Image


Sun Almanac for Newcastle, Illinois
Sunrise: 07:00 AM
Sunset: 4:36 PM
Civil Sunrise:06:31 AM
Civil Sunset: 5:06 PM
Nautical Sunrise: 05:58 AM
Nautical Sunset: 5:38 PM
Astro Sunrise: 05:26 AM
Astro Sunset: 6:10 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.