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O Fallon, MO
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7-Day Forecast
Tonight
Increasing Clouds
Low: 34°
Increasing clouds with a low around 34.
Calm wind becoming
southeast around 5 mph after midnight.
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Thursday
Rain and Patchy Fog
High: 49°
Rain and thunderstorms likely,
then rain and possibly a thunderstorm after 10am.
Patchy fog after 3pm.
High near 49.
Southeast wind 6 to 8 mph.
Chance of precipitation is 90%.
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Thursday Night
Rain and Patchy Fog then Chance Rain and Patchy Fog
Low: 44°
Rain and possibly a thunderstorm before 9pm,
then a chance of rain and thunderstorms
between 9pm and 3am,
then a chance of rain after 3am.
Patchy fog before 1am.
Low around 44.
Southeast wind 6 to 9 mph becoming
southwest after midnight.
Chance of precipitation is 80%.
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Friday
Chance Rain
High: 51°
A 30% chance of rain, mainly before noon.
Mostly cloudy with a high near 51.
Southwest wind 9 to 14 mph becoming
northwest in the afternoon.
Winds could gust as high as 24 mph.
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Friday Night
Mostly Cloudy
Low: 33°
Mostly cloudy with a low around 33.
Northwest wind 5 to 8 mph becoming calm after midnight.
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Saturday
Mostly Sunny
High: 52°
Mostly sunny with a high near 52.
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Saturday Night
Mostly Cloudy
Low: 42°
Mostly cloudy with a low around 42.
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Sunday
Partly Sunny
High: 64°
Partly sunny with a high near 64.
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Sunday Night
Mostly Cloudy
Low: 41°
Mostly cloudy with a low around 41.
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Monday
Partly Sunny
High: 54°
Partly sunny with a high near 54.
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Monday Night
Partly Cloudy
Low: 32°
Partly cloudy with a low around 32.
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Tuesday
Mostly Sunny
High: 47°
Mostly sunny with a high near 47.
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Tuesday Night
Mostly Cloudy then Slight Chance Rain
Low: 35°
A 20% chance of rain.
Mostly cloudy with a low around 35.
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Wednesday
Chance Rain
High: 45°
A 40% chance of rain.
Mostly cloudy with a high near 45.
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Source: National Weather Service
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