Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Caribbean, Bahamas on alert as Erin set to strengthen into hurricane. Get details Chevron right

O'Fallon, MO

74°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Missouri

74°
No results found.
Try searching for a city, zip code or point of interest.
settings
O'Fallon, MO 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

Tonight's Weather

Tue, Aug 12

A thunderstorm in the area late this evening; otherwise, partly cloudy; there can be flooding in low-lying and poor drainage areas Lo: 69°

Tomorrow: Partly sunny and nice Hi: 87°

Current Weather

11:36 PM

74°F
RealFeel® 82°
Mostly cloudy More Details
Wind SW 1 mph
Wind Gusts 1 mph
Air Quality Poor

O'Fallon Weather Radar

O'Fallon Weather Radar
Static Radar Temporarily Unavailable
Thank you for your patience as we work to get everything up and running again.
Refresh Page
Clouds
Temperature

Hourly Weather

12 AM 72°
rain drop 40%
1 AM 72°
rain drop 45%
2 AM 71°
rain drop 5%
3 AM 71°
rain drop 2%
4 AM 70°
rain drop 2%
5 AM 70°
rain drop 2%
6 AM 69°
rain drop 2%
7 AM 71°
rain drop 1%
8 AM 73°
rain drop 2%
9 AM 76°
rain drop 2%
10 AM 78°
rain drop 2%
11 AM 80°
rain drop 2%

10-Day Weather Forecast

Tonight

8/12

69° Lo

A t-storm late this evening

49%

Wed

8/13

87° 67°

Partly sunny and nice

Night: Clear

25%

Thu

8/14

89° 68°

Partly sunny

Clear

25%

Fri

8/15

96° 74°

Partly sunny and hot

Mainly clear and humid

4%

Sat

8/16

99° 75°

Partly sunny and very hot

Mainly clear, warm and humid

2%

Sun

8/17

98° 76°

Mostly sunny and hot

Clear and warm

2%

Mon

8/18

95° 75°

Mostly sunny and hot

Clear, warm and humid

2%

Tue

8/19

90° 73°

Mostly sunny and humid

Mainly clear and humid

2%

Wed

8/20

82° 69°

Humid with a t-storm in spots

Low clouds

55%

Thu

8/21

82° 66°

Low clouds and less humid

Mainly clear

6%

Sun & Moon

13 hrs 47 mins
Rise 6:12 AM
Set 7:59 PM
Waning Gibbous
Rise 9:49 PM
Set 11:01 AM

Air Quality

See More
Air Quality Poor

The air has reached a high level of pollution and is unhealthy for sensitive groups. Reduce time spent outside if you are feeling symptoms such as difficulty breathing or throat irritation.

Allergy Outlook

See All
Tree Pollen Low Data is not supported in this location Ragweed Pollen Moderate Data is not supported in this location Mold Low Data is not supported in this location Grass Pollen Low Data is not supported in this location Dust & Dander Extreme Data is not supported in this location

Top Stories

Hurricane

Erin to strengthen, turn northward with dangers on US East Coast

5 hours ago

Astronomy

TONIGHT: Perseid meteor shower peaks, but watch out for the moon

9 hours ago

Weather Forecasts

Downpours to end much of Northeast's dry spell at midweek

5 hours ago

Weather News

Lee Fire rages in Colorado amid severe western wildfire season

17 hours ago

Hurricane

The last time we had a Hurricane Erin, it was on 9/11

12 hours ago

More Stories

Featured Stories

Weather News

The Texas floods uncovered 100-million-year-old dinosaur tracks

2 days ago

Weather News

Fire breaks out on Arthur’s Seat, Edinburgh’s famous dormant volcano

1 day ago

Weather News

Deep-sea submersible came across an undiscovered ecosystem

1 day ago

Astronomy

Meteorite that hit Georgia determined to be older than Earth

1 day ago

Live Blog

UK Beats US for one tornado measure

LATEST ENTRY

Does the United Kingdom get twice as many tornadoes as the United States?

16 hours ago

World North America United States Missouri 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

...

...

...