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  1. Mostly cloudy, 2:25 PM

    Mostly cloudy
    24
    • Precipitation: 4%
    • Humidity: 59%
    • Wind: 10 km/h
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  1. Jun 22, 2023 · Get the current weather conditions and the 10-day outlook for O'Fallon, MO. See the temperature, humidity, precipitation, air quality, and allergy levels for each day.

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      Know what's coming with AccuWeather's extended daily...

  2. Be prepared with the most accurate 10-day forecast for O'Fallon, MO with highs, lows, chance of precipitation from The Weather Channel and Weather.com.

  3. Hourly Local Weather Forecast, weather conditions, precipitation, dew point, humidity, wind from Weather.com and The Weather Channel.

  4. Current weather in O'Fallon, MO. Check current conditions in O'Fallon, MO with radar, hourly, and more.

  5. Know what's coming with AccuWeather's extended daily forecasts for O'Fallon, MO. Up to 90 days of daily highs, lows, and precipitation chances.

  6. 1 day ago · 78 °F. like 79°. Mostly Cloudy. N. 0. Gusts 1mph. Tomorrow's temperature is forecast to be MUCH COOLER than today.

  7. 2 Miles WNW O'Fallon MO. Tonight. Low: 54 °F. Slight Chance T-storms then Patchy Fog. Wednesday. High: 76 °F. Patchy Fog then Mostly Sunny. Wednesday Night. Low: 54 °F. Partly Cloudy. Thursday.