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O Fallon, MO
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7-Day Forecast
Today
Decreasing Clouds and Breezy
High: 44°
Mostly cloudy,
then gradually becoming sunny with a high near 44.
Breezy with a northwest wind 18 to 21 mph
with gusts as high as 34 mph.
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Tonight
Mostly Cloudy
Low: 34°
Mostly cloudy with a low around 34.
Northwest wind 11 to 17 mph
with gusts as high as 31 mph.
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Friday
Partly Sunny
High: 47°
Partly sunny with a high near 47.
Northwest wind 8 to 11 mph.
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Friday Night
Partly Cloudy
Low: 31°
Partly cloudy with a low around 31.
Northwest wind around 6 mph becoming calm in the evening.
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Saturday
Sunny
High: 52°
Sunny with a high near 52.
Light and variable wind.
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Saturday Night
Partly Cloudy
Low: 40°
Partly cloudy with a low around 40.
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Sunday
Mostly Sunny
High: 63°
Mostly sunny with a high near 63.
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Sunday Night
Chance Rain
Low: 48°
A 40% chance of rain, mainly after midnight.
Mostly cloudy with a low around 48.
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Monday
Chance Rain
High: 56°
A 30% chance of rain, mainly before noon.
Partly sunny with a high near 56.
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Monday Night
Mostly Clear
Low: 29°
Mostly clear with a low around 29.
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Tuesday
Mostly Sunny
High: 42°
Mostly sunny with a high near 42.
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Tuesday Night
Mostly Cloudy then Slight Chance Rain
Low: 30°
A 20% chance of rain.
Mostly cloudy with a low around 30.
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Wednesday
Chance Rain
High: 43°
A 30% chance of rain.
Partly sunny with a high near 43.
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Source: National Weather Service
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