Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Warming atmosphere fueling heavier U.S. rainfall and rising flood risk. Get the details Chevron right
Gabrielle may become next hurricane as Atlantic heats up. Get the latest. Chevron right

O'Fallon, IL

63°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Illinois

63°
No results found.
Try searching for a city, zip code or point of interest.
settings
O'Fallon, IL Weather
Today WinterCast Local {stormName} Tracker Hourly Daily 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 Daily Radar MinuteCast® Monthly Air Quality Health & Activities
Friday, December 19

Day

12/19
34°Hi
RealFeel® 20°
Very Cold
RealFeel Guide
Very Cold
10° to 24°
Caution advised. Older adults, infants, and those with sensitive medical conditions, should be well dressed to protect from hypothermia and frostbite. Coat, hat, gloves and a scarf are appropriate.
LEARN MORE
RealFeel Shade™ 20°
Very Cold
RealFeel Guide
Very Cold
10° to 24°
Caution advised. Older adults, infants, and those with sensitive medical conditions, should be well dressed to protect from hypothermia and frostbite. Coat, hat, gloves and a scarf are appropriate.
LEARN MORE
Cloudy and cold with snow and sleet

Max UV Index1.0 (Low)

WindN 16 mph

Wind Gusts25 mph

Probability of Precipitation75%

Probability of Thunderstorms0%

Precipitation0.20 in

Snow0.2

Ice0.19 in

Hours of Precipitation5

Cloud Cover98%

Night

12/19
17°Lo
RealFeel® 7°
Bitterly Cold
RealFeel Guide
Bitterly Cold
-10° to 9°
Caution advised. Frostbite to exposed skin within 15 minutes. Hypothermia likely without protective clothing.
LEARN MORE
Mostly cloudy and cold

WindNNW 13 mph

Wind Gusts25 mph

Probability of Precipitation1%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover91%

Sun & Moon

9 hrs 28 mins
Rise 8:13 AM
Set 5:41 PM
New Moon
Rise 8:12 AM
Set 5:07 PM

Temperature History

12/19
High
Low
Forecast
34°
17°
Average
44°
26°
Last Year
47°
25°

Further Ahead

Hourly

Daily

Monthly

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Weather News

AccuWeather study: Flood risk rising as US storms grow more intense

1 day ago

Weather News

Mudslides damage homes, bury roads and cars in Southern California

1 day ago

Hurricane

Gabrielle may become hurricane, 2 more areas being watched

15 hours ago

Weather Forecasts

Where’s the rain? Dry pattern grips the East

14 hours ago

Weather Forecasts

New storm eyes West for late September, bringing another round of rain

1 hour ago

 More Stories

Featured Stories

Climate

The ‘blob’ is back — and it stretches across the entire North Pacific

1 day ago

Astronomy

Saturn to glow brighter than usual this weekend as it reaches oppositi...

1 day ago
Live Blog

Does this radar loop show insects or birds?

LATEST ENTRY

Expert debunks claim about weird weather radar

4 days ago

Health

The US is tracking 14 potential rabies outbreaks in 20 states.

2 days ago

Weather News

Mount St. Helens stirring up leftover ash 45 years after ‘the big one’

3 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 RealFeel® and RealFeel Shade™ 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 RealFeel® and RealFeel Shade™ 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
© 2025 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

...

...

...