Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Peak hurricane season is here, but will a hurricane form this year in the Atlantic? Click for details. Chevron right

O'Fallon, IL

92°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Illinois

92°
No results found.
Try searching for a city, zip code or point of interest.
Get Premium+
Create Your Account Unlock extended daily and hourly forecasts — all with your free account.
Let's Go Chevron right
Have an account already? Log In
settings
Help
O'Fallon, IL Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps
News

News & Features

Astronomy

Business

Climate

Health

Recreation

Sports

Travel
For Business

Warnings

Data Suite

Forensics

Advertising

Superior Accuracy™

Video

Winter Center
Today Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities
September 9

Afternoon

9/9
92°
RealFeel® 102°
Very Hot
RealFeel Guide
Very Hot
101° to 107°
Caution advised. Danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
RealFeel Shade™ 97°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
Partly sunny and hot with a thunderstorm
alerts

Heat Advisory

12:00 PM Wednesday - 7:00 PM Wednesday

WindSW 8 mph

Wind Gusts14 mph

Humidity58%

Dew Point73°

Probability of Precipitation100%

Precipitation0.12 in

Rain Amount0.12 in

Cloud Cover14%

Visibility11 mi

Evening

Day & Night

Sun & Moon

12 hrs 42 mins
Rise 6:36 AM
Set 7:18 PM
Waning Crescent
Rise 4:48 AM
Set 6:33 PM

Temperature History

9/9
High
Low
Forecast
95°
72°
Average
85°
59°
Last Year
83°
48°
Record
98°
1955
44°
1986

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Hurricane

Will 2026 go down with no Atlantic hurricanes?

57 minutes ago

Hurricane

Former Hurricane Marie surf opens massive Malibu sinkhole

3 hours ago

Weather Forecasts

Heat to bake California as waves hammer coastline this week

50 minutes ago

Recreation

Climbers rescued from Mount Shasta said they 'relied too much on AI'

2 days ago

Weather Forecasts

Heat relief for central U.S. as temperatures surge in the east

56 minutes ago

 More Stories

Featured Stories

Hurricane

Hurricane Lowell swipes Hawaii, knocking out power to Kaua'i

5 hours ago

Weather News

Spotted lanternflies have spread to 22 states: ‘They’re here to stay’

1 day ago

Recreation

Strong winds ground helicopter as hikers await rescue on Utah mountain

3 hours ago

Recreation

Alligator attacks child swimming in restricted Florida waters

3 hours ago

Health

Doctors release vaccine recommendations for RSV, influenza, COVID-19

2 days ago
World North America United States Illinois O'Fallon

Weather Near O'Fallon:

  • O'Fallon, MO
  • St. Charles, MO
  • St. Louis, MO
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
© 2026 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | About Your Privacy Do Not Sell or Share My Personal Information | Data Sources

...

...

...