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December 18th, 2025 :: 9:26 am CST   

Local Weather Report for
Altamont
Illinois, United States

 Altamont Weather Forecast Summary  
 
Today
Dec 18th
Friday
Dec 19th
Saturday
Dec 20th
Sunday
Dec 21st
Monday
Dec 22nd
Mix of rain and snow Cloudy Cloudy Cloudy Cloudy
55°F
36°F
26°F
50°F
33°F
37°F
28°F
35°F
28°F
 
 Altamont Detailed Weather Forecast  
 
Thursday, December 18th, 2025
Morning Temperature: 50°F
Cloudy with a few showers. Wind 20 to 30 mph.
Afternoon Temperature: 38°F
A mix of cloud and sun with a chance of showers. Showers possibly mixed with wet flurries. Windy.
Evening Temperature: 28°F
A mix of cloudy and clear skies. Windy.
Friday, December 19th, 2025
Overnight Temperature: 26°F
Clear. Windy.
Morning Temperature: 32°F
Cloudy. Windy at times.
Afternoon Temperature: 31°F
Sunny.
Evening Temperature: 32°F
Cloudy. Windy at times.
Saturday, December 20th, 2025
Overnight Temperature: 35°F
Cloudy. Windy at times.
Morning Temperature: 44°F
Cloudy. Windy at times.
Afternoon Temperature: 39°F
Sunny. Windy at times.
Evening Temperature: 33°F
Clear with cloudy periods.
Sunday, December 21st, 2025
Overnight Temperature: 32°F
Clear. Windy at times.
Morning Temperature: 34°F
A mix of cloud and sun. Windy at times.
Afternoon Temperature: 30°F
A mix of cloud and sun.
Evening Temperature: 29°F
Cloudy. Windy at times.
Monday, December 22nd, 2025
Overnight Temperature: 29°F
Cloudy. Windy at times.
Morning Temperature: 34°F
Cloudy. Windy at times.
Afternoon Temperature: 34°F
Sunny. Windy at times.
Evening Temperature: 35°F
Clear with cloudy periods. Windy at times.
Tuesday, December 23rd, 2025
Overnight Temperature: 39°F
Cloudy. Windy at times.
Morning Temperature: 48°F
Cloudy with a chance of showers.
Afternoon Temperature: 53°F
Cloudy.
Evening Temperature: 54°F
Cloudy.
Wednesday, December 24th, 2025
Overnight Temperature: 55°F
Cloudy.
Morning Temperature: 62°F
Cloudy. Windy at times.
Afternoon Temperature: 61°F
Mostly sunny.
Evening Temperature: 59°F
Cloudy. Windy at times.
Thursday, December 25th, 2025
Overnight Temperature: 56°F
Cloudy.
Morning Temperature: 63°F
Cloudy. Windy at times.
Afternoon Temperature: 62°F
Cloudy.
Evening Temperature: 62°F
Cloudy with a slight chance of showers. Windy at times.
Friday, December 26th, 2025
Overnight Temperature: 52°F
Cloudy with a slight chance of showers. Windy.
Morning Temperature: 46°F
Cloudy. Windy at times.
Afternoon Temperature: 42°F
Cloudy. Windy at times.
Evening Temperature: 40°F
Cloudy.





 

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This WeatherCity Weather Forecast for Altamont, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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