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Current Weather Conditions for O Fallon, IL

A slight chance of showers and thunderstorms before 4am. Partly cloudy, with a low around 75. Heat index values as high as 102. South wind 8 to 15 mph. Chance of precipitation is 20%.
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Conditions

Wind: 15 mph S
Humidity: 56%
Probability of Precipitation: 18%

Hourly Forcast (next 12 hours)

11 PM 12 AM 1 AM 2 AM 3 AM 4 AM 5 AM 6 AM 7 AM 8 AM 9 AM 10 AM 11 AM
92° 90° 87° 84° 83° 81° 80° 80° 79° 77° 77° 77° 76°

Upcoming Week

Day Forecast High Low
Tonight
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 4am. Partly cloudy, with a low around 75. Heat index values as high as 102. South wind 8 to 15 mph. Chance of precipitation is 20%.
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Thursday
Sunny
Sunny, with a high near 95. Heat index values as high as 106. South wind 8 to 18 mph, with gusts as high as 28 mph.
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Thursday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 9pm, then showers and thunderstorms between 9pm and midnight, then a chance of showers and thunderstorms between midnight and 1am. Mostly cloudy, with a low around 66. West wind 6 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
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Friday
Sunny
Sunny, with a high near 84. Northwest wind around 6 mph.
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Friday Night
Mostly Clear
Mostly clear, with a low around 65. North wind 0 to 3 mph.
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Saturday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
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Saturday Night
Chance Showers And Thunderstorms then Showers And Thunderstorms
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 80%.
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Sunday
Showers And Thunderstorms then Chance Showers And Thunderstorms
Showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Chance of precipitation is 80%.
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Sunday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
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Monday
Chance Showers And Thunderstorms
A chance of rain showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 75. Chance of precipitation is 30%.
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Monday Night
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
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Tuesday
Mostly Sunny
Mostly sunny, with a high near 80.
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Tuesday Night
Partly Cloudy
Partly cloudy, with a low around 62.
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Wednesday
Mostly Sunny
Mostly sunny, with a high near 84.
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Data provided by weather.gov