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September 15th, 2025 :: 2:20 pm CDT   

Local Weather Report for
Petersburg
Illinois, United States

 Current Petersburg Weather Conditions Updated September 15th at 12:55 pm 
Temperature:91°F Dew Point:66°F
Barometer:30.06 inHg Wind:N 11 Mph
Humidity:43.7% Visibility:0M
 
 Petersburg Weather Forecast Summary  
 
Today
Sep 15th
Tuesday
Sep 16th
Wednesday
Sep 17th
Thursday
Sep 18th
Friday
Sep 19th
Mix of Cloud and Sun Sunny Mostly Sunny Cloudy Cloudy
95°F
95°F
66°F
95°F
66°F
98°F
69°F
86°F
65°F
 
 Petersburg Detailed Weather Forecast  
 
Monday, September 15th, 2025
Afternoon Temperature: 90°F
A mix of cloud and sun. Slight chance of a thunderstorm.
Evening Temperature: 74°F
Clear with cloudy periods.
Tuesday, September 16th, 2025
Overnight Temperature: 67°F
Clear.
Morning Temperature: 87°F
Sunny.
Afternoon Temperature: 89°F
Sunny.
Evening Temperature: 73°F
Clear.
Wednesday, September 17th, 2025
Overnight Temperature: 67°F
Clear.
Morning Temperature: 89°F
Sunny.
Afternoon Temperature: 90°F
Sunny.
Evening Temperature: 72°F
Clear with cloudy periods.
Thursday, September 18th, 2025
Overnight Temperature: 70°F
Clear.
Morning Temperature: 91°F
Sunny. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 93°F
Cloudy. Slight chance of a thunderstorm.
Evening Temperature: 76°F
Cloudy.
Friday, September 19th, 2025
Overnight Temperature: 67°F
A mix of cloudy and clear skies.
Morning Temperature: 82°F
Cloudy with a chance of showers. Slight chance of a thunderstorm.
Afternoon Temperature: 82°F
Cloudy. Slight chance of a thunderstorm.
Evening Temperature: 67°F
Cloudy.
Saturday, September 20th, 2025
Overnight Temperature: 67°F
Cloudy.
Morning Temperature: 86°F
Cloudy. Slight chance of a thunderstorm.
Afternoon Temperature: 85°F
Cloudy. Slight chance of a thunderstorm.
Evening Temperature: 67°F
Cloudy with a chance of showers.
Sunday, September 21st, 2025
Overnight Temperature: 65°F
Cloudy with showers likely.
Morning Temperature: 70°F
Cloudy with a chance of showers. Windy at times.
Afternoon Temperature: 72°F
Cloudy with showers likely. Slight chance of a thunderstorm.
Evening Temperature: 67°F
A mix of cloudy and clear skies with a few showers. Slight chance of a thunderstorm.
Monday, September 22nd, 2025
Overnight Temperature: 65°F
A mix of cloudy and clear skies with showers likely.
Morning Temperature: 79°F
Cloudy. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 84°F
Cloudy. Chance of a thunderstorm. Windy at times.
Evening Temperature: 70°F
Clear with showers likely. Slight chance of a thunderstorm. Windy at times.
Tuesday, September 23rd, 2025
Overnight Temperature: 68°F
Cloudy with showers likely. Windy at times.
Morning Temperature: 84°F
Sunny. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 88°F
Sunny. Chance of a thunderstorm.
Evening Temperature: 72°F
Clear.





 

  [ Local Weather Report ]
Fairview Heights, IL 
12:53 PM  90°F
 
 
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12:55 PM  91°F
 
 
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12:53 PM  90°F
 
 
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12:55 PM  91°F
 
 
Belleville, IL 
12:55 PM  91°F
 
 
Crest Hill, IL 
12:53 PM  90°F
 
 
Mascoutah, IL 
12:55 PM  91°F
 
 
Troy, IL 
 
Centreville, IL 
12:53 PM  90°F
 
 
Cahokia, IL 
12:53 PM  90°F
 

This WeatherCity Weather Forecast for Petersburg, 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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