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 between 7pm and 8pm. Mostly cloudy, with a low around 77. Heat index values as high as 117. North wind 2 to 6 mph. Chance of precipitation is 20%.
95°F

Conditions

Wind: 6 mph W
Humidity: 64%
Probability of Precipitation: 14%

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
95° 92° 89° 86° 85° 83° 82° 80° 79° 79° 78° 77° 78°

Upcoming Week

Day Forecast High Low
Tonight
Slight Chance Showers And Thunderstorms then Mostly Cloudy
A slight chance of showers and thunderstorms between 7pm and 8pm. Mostly cloudy, with a low around 77. Heat index values as high as 117. North wind 2 to 6 mph. Chance of precipitation is 20%.
95°F 69°F
Monday
Sunny
Sunny, with a high near 97. Heat index values as high as 114. South wind 2 to 9 mph.
95°F 69°F
Monday Night
Mostly Clear
Mostly clear, with a low around 79. Heat index values as high as 112. Southwest wind around 8 mph.
95°F 69°F
Tuesday
Mostly Sunny
Mostly sunny, with a high near 92. Heat index values as high as 105. North wind 6 to 12 mph.
95°F 69°F
Tuesday Night
Mostly Clear
Mostly clear, with a low around 70. Northeast wind 3 to 12 mph.
95°F 69°F
Wednesday
Sunny
Sunny, with a high near 87.
95°F 69°F
Wednesday Night
Mostly Clear
Mostly clear, with a low around 67.
95°F 69°F
Thursday
Sunny
Sunny, with a high near 88.
95°F 69°F
Thursday Night
Partly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 1am. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
95°F 69°F
Friday
Chance Rain Showers
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 40%.
95°F 69°F
Friday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
95°F 69°F
Saturday
Chance Rain Showers
A chance of rain showers before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 40%.
95°F 69°F
Saturday Night
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
95°F 69°F
Sunday
Sunny
Sunny, with a high near 85.
95°F 69°F
Data provided by weather.gov