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June 21st, 2026 :: 3:47 am CDT   

Local Weather Report for
Eureka
Illinois, United States

 Eureka Weather Forecast Summary  
 
Today
Jun 21st
Monday
Jun 22nd
Tuesday
Jun 23rd
Wednesday
Jun 24th
Thursday
Jun 25th
Showers Mix of Sun and Cloud Mostly Sunny Thundershowers Mostly Sunny
63°F
71°F
57°F
75°F
53°F
75°F
58°F
74°F
62°F
 
 Eureka Detailed Weather Forecast  
 
Sunday, June 21st, 2026
Overnight Temperature: 62°F
Clear with cloudy periods.
Morning Temperature: 62°F
Cloudy with a chance of showers. Windy at times.
Afternoon Temperature: 61°F
Cloudy with showers. Windy at times.
Evening Temperature: 58°F
A mix of cloudy and clear skies with a few showers. Windy.
Monday, June 22nd, 2026
Overnight Temperature: 58°F
A mix of cloudy and clear skies with a slight chance of showers. Windy at times.
Morning Temperature: 60°F
A mix of cloud and sun. Windy at times.
Afternoon Temperature: 69°F
A mix of sun and cloud. Windy at times.
Evening Temperature: 64°F
Clear.
Tuesday, June 23rd, 2026
Overnight Temperature: 54°F
Clear.
Morning Temperature: 60°F
Sunny.
Afternoon Temperature: 73°F
Sunny.
Evening Temperature: 67°F
Clear with cloudy periods.
Wednesday, June 24th, 2026
Overnight Temperature: 59°F
Clear with cloudy periods.
Morning Temperature: 66°F
A mix of sun and cloud. Windy at times.
Afternoon Temperature: 75°F
A mix of sun and cloud with showers likely. Chance of a thunderstorm. Windy at times.
Evening Temperature: 70°F
Clear with cloudy periods with a chance of showers or thundershowers.
Thursday, June 25th, 2026
Overnight Temperature: 64°F
Clear with a chance of showers. Slight chance of a thunderstorm.
Morning Temperature: 69°F
Mostly sunny. Slight chance of a thunderstorm.
Afternoon Temperature: 74°F
Mostly sunny. Windy at times.
Evening Temperature: 67°F
Clear.
Friday, June 26th, 2026
Overnight Temperature: 60°F
Clear.
Morning Temperature: 66°F
Mostly sunny. Windy at times.
Afternoon Temperature: 68°F
Cloudy with rain, at times heavy. Windy at times.
Evening Temperature: 69°F
Mostly cloudy with periods of rain. Windy at times.
Saturday, June 27th, 2026
Overnight Temperature: 68°F
A mix of cloudy and clear skies with a chance of showers. Slight chance of a thunderstorm.
Morning Temperature: 66°F
A mix of cloud and sun.
Afternoon Temperature: 71°F
A mix of cloud and sun.
Evening Temperature: 69°F
Clear with cloudy periods.
Sunday, June 28th, 2026
Overnight Temperature: 62°F
Clear with a slight chance of showers.
Morning Temperature: 67°F
A mix of cloud and sun with a chance of showers.
Afternoon Temperature: 81°F
A mix of sun and cloud. Chance of a thunderstorm. Windy at times.
Evening Temperature: 78°F
Mostly clear. Chance of a thunderstorm. Windy at times.
Monday, June 29th, 2026
Overnight Temperature: 73°F
Mostly clear. Chance of a thunderstorm. Windy at times.
Morning Temperature: 78°F
Mostly sunny. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 86°F
Mostly sunny with a chance of showers or thundershowers. Windy at times.
Evening Temperature: 78°F
Mostly clear with a chance of showers or thundershowers. Windy at times.





 

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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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