Weather in O'Fallon, Illinois as of 25 June, 2025. Temperature, rain and forecast for this week.

The following widget shows the weather in O'Fallon, Illinois as of 25 June, 2025. Click on the widget to open the weather forecast for O'Fallon. Please note: the weather in O'Fallon may change in any second, so make your decisions wisely and follow the news.

O'FALLON WEATHER

Add this page to favorites so you can stay updated about the actual weather in O'Fallon, Illinois.

Good weather and PEACE to everyone!

Check out more data on weather in Illinois:

• Weather in Chicago
• Weather in Peoria
• Weather in Highland Park
• Weather in Orland Park
• Weather in Normal
• Weather in Elmhurst
• Weather in Bartlett
• Weather in Quincy
• Weather in Carpentersville
• Weather in Calumet City
• Weather in Niles
• Weather in Burbank
• Weather in Granite City
• Weather in Oak Forest
• Weather in Alton
• Weather in Homer Glen
• Weather in Elmwood Park