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July 21st, 2026 :: 8:04 pm CDT   

Local Weather Report for
Eureka
Illinois, United States

 Eureka Weather Forecast Summary  
 
Today
Jul 21st
Wednesday
Jul 22nd
Thursday
Jul 23rd
Friday
Jul 24th
Saturday
Jul 25th
Mostly Sunny Mostly Sunny Mostly Sunny Mostly Cloudy Mix of Cloud and Sun
78°F
67°F
54°F
72°F
54°F
67°F
60°F
77°F
61°F
 
 Eureka Detailed Weather Forecast  
 
Tuesday, July 21st, 2026
Evening Temperature: 68°F
Mostly clear. Windy at times.
Wednesday, July 22nd, 2026
Overnight Temperature: 60°F
Clear.
Morning Temperature: 58°F
Sunny. Windy at times.
Afternoon Temperature: 67°F
Mostly sunny. Windy at times.
Evening Temperature: 61°F
Mostly clear.
Thursday, July 23rd, 2026
Overnight Temperature: 55°F
Clear.
Morning Temperature: 61°F
Sunny.
Afternoon Temperature: 71°F
Mostly sunny.
Evening Temperature: 65°F
Clear with cloudy periods.
Friday, July 24th, 2026
Overnight Temperature: 63°F
Cloudy.
Morning Temperature: 61°F
Cloudy with a chance of showers.
Afternoon Temperature: 66°F
A mix of cloud and sun.
Evening Temperature: 64°F
A mix of cloudy and clear skies.
Saturday, July 25th, 2026
Overnight Temperature: 62°F
A mix of cloudy and clear skies.
Morning Temperature: 63°F
A mix of cloud and sun.
Afternoon Temperature: 75°F
A mix of cloud and sun. Slight chance of a thunderstorm.
Evening Temperature: 73°F
Clear with cloudy periods. Chance of a thunderstorm.
Sunday, July 26th, 2026
Overnight Temperature: 69°F
A mix of clear and cloudy skies. Slight chance of a thunderstorm. Windy at times.
Morning Temperature: 75°F
Sunny. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 89°F
Mostly sunny. Chance of a thunderstorm. Windy at times.
Evening Temperature: 84°F
Clear. Chance of a thunderstorm.
Monday, July 27th, 2026
Overnight Temperature: 78°F
Clear with cloudy periods. Chance of a thunderstorm. Windy at times.
Morning Temperature: 81°F
Sunny. Chance of a thunderstorm. Windy.
Afternoon Temperature: 90°F
Sunny. Chance of a thunderstorm. Windy.
Evening Temperature: 79°F
Clear. Chance of a thunderstorm. Windy at times.
Tuesday, July 28th, 2026
Overnight Temperature: 68°F
Clear.
Morning Temperature: 73°F
Sunny. Chance of a thunderstorm.
Afternoon Temperature: 83°F
Sunny. Chance of a thunderstorm.
Evening Temperature: 76°F
Mostly clear. Chance of a thunderstorm.
Wednesday, July 29th, 2026
Overnight Temperature: 68°F
Clear.
Morning Temperature: 70°F
Mostly sunny.
Afternoon Temperature: 84°F
Sunny. Chance of a thunderstorm. Windy at times.
Evening Temperature: 78°F
Clear. Chance of a thunderstorm.





 

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6:54 PM  79°F
 
 
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6:55 PM  79°F
haze
 
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6:56 PM  81°F
Mostly Cloudy
 
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This WeatherCity Weather Forecast for Eureka, 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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