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Current Weather Conditions for O Fallon, IL

Mostly sunny, with a high near 91. Heat index values as high as 100. East wind around 6 mph.
89°F

Conditions

Wind: 3 mph E
Humidity: 57%
Probability of Precipitation: 3%

Hourly Forcast (next 12 hours)

6 PM 7 PM 8 PM 9 PM 10 PM 11 PM 12 AM 1 AM 2 AM 3 AM 4 AM 5 AM 6 AM
89° 90° 91° 91° 91° 91° 90° 85° 82° 81° 79° 78° 77°

Upcoming Week

Day Forecast High Low
This Afternoon
Mostly Sunny
Mostly sunny, with a high near 91. Heat index values as high as 100. East wind around 6 mph.
91°F 73°F
Tonight
Mostly Clear
Mostly clear, with a low around 74. Southeast wind 1 to 5 mph.
91°F 73°F
Thursday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 91. Heat index values as high as 101. Southeast wind 1 to 5 mph. Chance of precipitation is 50%.
91°F 73°F
Thursday Night
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 74. Southwest wind 1 to 6 mph. Chance of precipitation is 40%.
91°F 73°F
Friday
Showers And Thunderstorms Likely
Showers and thunderstorms likely after 7am. Mostly sunny, with a high near 91. West wind 2 to 8 mph. Chance of precipitation is 70%.
91°F 73°F
Friday Night
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Mostly clear, with a low around 74. Chance of precipitation is 70%.
91°F 73°F
Saturday
Sunny
Sunny, with a high near 94.
91°F 73°F
Saturday Night
Mostly Clear
Mostly clear, with a low around 75.
91°F 73°F
Sunday
Sunny
Sunny, with a high near 93.
91°F 73°F
Sunday Night
Mostly Clear
Mostly clear, with a low around 74.
91°F 73°F
Monday
Mostly Sunny
Mostly sunny, with a high near 96.
91°F 73°F
Monday Night
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 75. Chance of precipitation is 20%.
91°F 73°F
Tuesday
Slight Chance Rain Showers then Mostly Sunny
A slight chance of rain showers before 7am. Mostly sunny, with a high near 91. Chance of precipitation is 20%.
91°F 73°F
Tuesday Night
Partly Cloudy
Partly cloudy, with a low around 67.
91°F 73°F
Data provided by weather.gov