32°
Dry and Partly Cloudy
Feels Like: 26°
Min: 12°
Max: 28°
The next few hours will be clear, with today reaching 28°C and dropping to 13°C. The coming days will be hazy until afternoon, returning overnight, and breezy from afternoon until night.
Unlock Historical Data
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:42
Sunrise
20:21
Sunset
Daily Forecast
Today
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Air Quality Data Available
Upgrade to access real-time air quality data for O'Fallon.
Resources
UV Index
Humidity
Frequently asked questions about weather in O'Fallon
How warm does it get in O'Fallon?
The warmest month in O'Fallon is July, with average high temperatures of 31°C. The average temperature during this period is around 26°C.
How cold does it get in O'Fallon?
The coldest month in O'Fallon is January, with average low temperatures of -3°C. The average temperature during this period is around 0°C.
What is the wettest time of year in O'Fallon?
The wettest month in O'Fallon is May, with an average of 126mm of precipitation.
What is the driest time of year in O'Fallon?
The driest month in O'Fallon is February, with an average of 67mm of precipitation.
Explore more weather forecasts
- Dardenne Prairie, Missouri
- New York City, New York
- Saint Peters, Missouri
- Los Angeles, California
- Lake Saint Louis, Missouri
- Brooklyn, New York
- Wentzville, Missouri
- Chicago, Illinois
- Chesterfield, Missouri
- Houston, Texas
- Saint Charles, Missouri
- Queens, New York
- Wildwood, Missouri
- Phoenix, Arizona
- Ballwin, Missouri
- Philadelphia, Pennsylvania
