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May 15th, 2026 :: 5:58 am CDT   

Local Weather Report for
Chillicothe
Illinois, United States

 Chillicothe Weather Forecast Summary  
 
Today
May 15th
Saturday
May 16th
Sunday
May 17th
Monday
May 18th
Tuesday
May 19th
Mix of Sun and Cloud Mix of Sun and Cloud Thundershowers Mostly Sunny Thundershowers
76°F
79°F
65°F
83°F
64°F
83°F
70°F
72°F
57°F
 
 Chillicothe Detailed Weather Forecast  
 
Friday, May 15th, 2026
Morning Temperature: 59°F
Mostly cloudy. Windy at times.
Afternoon Temperature: 72°F
Mostly sunny. Windy at times.
Evening Temperature: 70°F
Mostly clear. Slight chance of a thunderstorm. Windy at times.
Saturday, May 16th, 2026
Overnight Temperature: 66°F
Clear with cloudy periods. Slight chance of a thunderstorm. Windy at times.
Morning Temperature: 67°F
A mix of cloud and sun with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Afternoon Temperature: 77°F
Mostly sunny with a chance of showers or thundershowers. Windy at times.
Evening Temperature: 69°F
A mix of cloudy and clear skies with a chance of showers or thundershowers. Windy at times.
Sunday, May 17th, 2026
Overnight Temperature: 65°F
Cloudy with showers likely. Windy at times.
Morning Temperature: 70°F
A mix of cloud and sun with a chance of showers or thundershowers. Windy at times.
Afternoon Temperature: 82°F
Sunny with cloudy periods. Chance of a thunderstorm. Windy.
Evening Temperature: 75°F
Mostly clear. Chance of a thunderstorm. Windy.
Monday, May 18th, 2026
Overnight Temperature: 71°F
Clear. Windy.
Morning Temperature: 74°F
A mix of cloud and sun with a slight chance of showers or thundershowers. Windy.
Afternoon Temperature: 82°F
Mostly cloudy with a chance of showers or thundershowers. Wind 20 to 30 mph.
Evening Temperature: 77°F
Mostly clear with a chance of showers or thundershowers. Windy.
Tuesday, May 19th, 2026
Overnight Temperature: 70°F
Mostly cloudy with a few showers. Chance of a thunderstorm. Windy.
Morning Temperature: 68°F
Mostly cloudy with a few showers. Windy.
Afternoon Temperature: 64°F
Mostly cloudy with a slight chance of showers. Windy at times.
Evening Temperature: 59°F
Clear with cloudy periods with a slight chance of showers. Windy at times.
Wednesday, May 20th, 2026
Overnight Temperature: 51°F
Mostly clear.
Morning Temperature: 52°F
Mostly sunny. Windy at times.
Afternoon Temperature: 63°F
Mostly sunny. Windy at times.
Evening Temperature: 56°F
Mostly clear.
Thursday, May 21st, 2026
Overnight Temperature: 48°F
Clear.
Morning Temperature: 52°F
Sunny with cloudy periods. Windy at times.
Afternoon Temperature: 58°F
Mostly cloudy. Windy at times.
Evening Temperature: 53°F
Clear with cloudy periods.
Friday, May 22nd, 2026
Overnight Temperature: 46°F
Clear.
Morning Temperature: 54°F
Sunny.
Afternoon Temperature: 69°F
Sunny.
Evening Temperature: 63°F
Mostly clear.
Saturday, May 23rd, 2026
Overnight Temperature: 57°F
Clear with cloudy periods. Windy at times.
Morning Temperature: 62°F
Cloudy with a chance of showers. Windy at times.
Afternoon Temperature: 64°F
Cloudy with a chance of showers. Windy at times.
Evening Temperature: 66°F
A mix of clear and cloudy skies with a slight chance of showers or thundershowers. Windy at times.





 

  [ Local Weather Report ]
Lacon, IL 
4:55 AM  57°F
light rain
 
Henry, IL 
 
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West Peoria, IL 
4:54 AM  54°F
moderate rain mist
 
Eureka, IL 
 
East Peoria, IL 
4:54 AM  54°F
moderate rain mist
 
Peoria, IL 
4:54 AM  54°F
moderate rain mist
 
Marquette Heights, IL 
4:54 AM  54°F
moderate rain mist
 
Pekin, IL 
 
Farmington, IL 

 
This WeatherCity Weather Forecast for Chillicothe, 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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