10-Day Weather Forecast for O'Fallon, Illinois 62269 - The Weather Channel | weather.com

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Daily ForecastO'Fallon, Illinois 62269· as of 11:55 AM UTC

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Editor's Pick

Your Outlook For April-June: What's In Store For You

The forecast for April, May and June is giving early heat vibes across most of the country, but there is one region where below-average temperatures are expected.

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