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Current Weather Conditions for O Fallon, IL

A chance of showers and thunderstorms. Partly sunny, with a high near 93. Heat index values as high as 103. Southwest wind around 7 mph. Chance of precipitation is 40%.
88°F

Conditions

Wind: 7 mph SW
Humidity: 66%
Probability of Precipitation: 15%

Hourly Forcast (next 12 hours)

4 PM 5 PM 6 PM 7 PM 8 PM 9 PM 10 PM 11 PM 12 AM 1 AM 2 AM 3 AM 4 AM
88° 91° 91° 91° 92° 91° 91° 90° 87° 84° 82° 80° 79°

Upcoming Week

Day Forecast High Low
Independence Day
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 93. Heat index values as high as 103. Southwest wind around 7 mph. Chance of precipitation is 40%.
92°F 79°F
Tonight
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Heat index values as high as 101. Southwest wind 3 to 7 mph. Chance of precipitation is 50%.
92°F 79°F
Sunday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 90. Northwest wind around 7 mph. Chance of precipitation is 40%.
92°F 79°F
Sunday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Northwest wind 1 to 7 mph. Chance of precipitation is 40%.
92°F 79°F
Monday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 87. North wind 2 to 7 mph. Chance of precipitation is 40%.
92°F 79°F
Monday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 40%.
92°F 79°F
Tuesday
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
92°F 79°F
Tuesday Night
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
92°F 79°F
Wednesday
Sunny
Sunny, with a high near 90.
92°F 79°F
Wednesday Night
Mostly Clear then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 73. Chance of precipitation is 20%.
92°F 79°F
Thursday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 30%.
92°F 79°F
Thursday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
92°F 79°F
Friday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 40%.
92°F 79°F
Friday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 40%.
92°F 79°F
Data provided by weather.gov