Weather in O'Fallon, Illinois as of 01 June, 2025. Temperature, rain and forecast for this week.

The following widget shows the weather in O'Fallon, Illinois as of 01 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

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Good weather and PEACE to everyone!

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