Find the Best Places in the United States

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

Current Weather Conditions for O Fallon, IL

Mostly sunny, with a high near 94. Heat index values as high as 102. Southwest wind 10 to 14 mph, with gusts as high as 22 mph.
85°F

Conditions

Wind: 10 mph SW
Humidity: 68%
Probability of Precipitation: 1%

Hourly Forcast (next 12 hours)

3 PM 4 PM 5 PM 6 PM 7 PM 8 PM 9 PM 10 PM 11 PM 12 AM 1 AM 2 AM 3 AM
85° 88° 91° 92° 92° 93° 91° 91° 91° 89° 86° 84° 82°

Upcoming Week

Day Forecast High Low
Today
Mostly Sunny
Mostly sunny, with a high near 94. Heat index values as high as 102. Southwest wind 10 to 14 mph, with gusts as high as 22 mph.
93°F 72°F
Tonight
Partly Cloudy
Partly cloudy, with a low around 76. Heat index values as high as 100. South wind 8 to 14 mph, with gusts as high as 22 mph.
93°F 72°F
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.
93°F 72°F
Thursday Night
Showers And Thunderstorms
Showers and thunderstorms between 7pm and 1am, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 68. West wind 6 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
93°F 72°F
Friday
Slight Chance Rain Showers then Sunny
A slight chance of rain showers before 7am. Sunny, with a high near 84. Northwest wind around 7 mph. Chance of precipitation is 20%.
93°F 72°F
Friday Night
Mostly Clear
Mostly clear, with a low around 65.
93°F 72°F
Saturday
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 40%.
93°F 72°F
Saturday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
93°F 72°F
Sunday
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.
93°F 72°F
Sunday Night
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 40%.
93°F 72°F
Monday
Chance Rain Showers then Slight Chance Showers And Thunderstorms
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 30%.
93°F 72°F
Monday Night
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
93°F 72°F
Tuesday
Mostly Sunny
Mostly sunny, with a high near 80.
93°F 72°F
Tuesday Night
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
93°F 72°F
Data provided by weather.gov