Find the Best Places in the United States

Compare Cost of Living, Education, Income, Population, and More.

Current Weather Conditions for O Fallon, IL

A slight chance of showers and thunderstorms before 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Southwest wind around 5 mph. Chance of precipitation is 30%.
74°F

Conditions

Wind: 3 mph SW
Humidity: 90%
Probability of Precipitation: 17%

Hourly Forcast (next 12 hours)

8 AM 9 AM 10 AM 11 AM 12 PM 1 PM 2 PM 3 PM 4 PM 5 PM 6 PM 7 PM 8 PM
74° 74° 73° 74° 75° 76° 80° 82° 84° 85° 87° 88° 90°

Upcoming Week

Day Forecast High Low
Overnight
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Southwest wind around 5 mph. Chance of precipitation is 30%.
80°F 65°F
Tuesday
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
Showers and thunderstorms likely before 10am, then a slight chance of showers and thunderstorms between 10am and 5pm. Partly sunny, with a high near 91. Heat index values as high as 106. Southwest wind 5 to 8 mph. Chance of precipitation is 70%.
80°F 65°F
Tuesday Night
Mostly Clear
Mostly clear, with a low around 75. Heat index values as high as 108. South wind around 7 mph.
80°F 65°F
Wednesday
Sunny
Sunny, with a high near 94. Heat index values as high as 105. South wind 7 to 14 mph, with gusts as high as 22 mph.
80°F 65°F
Wednesday Night
Mostly Clear
Mostly clear, with a low around 76. South wind 8 to 14 mph.
80°F 65°F
Thursday
Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Chance of precipitation is 20%.
80°F 65°F
Thursday Night
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 80%.
80°F 65°F
Friday
Chance Showers And Thunderstorms then Mostly Sunny
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
80°F 65°F
Friday Night
Mostly Clear
Mostly clear, with a low around 65.
80°F 65°F
Saturday
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 20%.
80°F 65°F
Saturday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 50%.
80°F 65°F
Sunday
Chance Rain Showers then Chance Showers And Thunderstorms
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 50%.
80°F 65°F
Sunday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
80°F 65°F
Monday
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 80. Chance of precipitation is 20%.
80°F 65°F
Data provided by weather.gov