Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Severe weather, flooding return to central US | Click to see the impacts. Chevron right

O'Fallon, MO

77°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Missouri

77°
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, MO 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

View hourly forecasts 10-days ahead

Activate Your Premium+ Subscription

Chevron right

5 PM

77°
RealFeel® 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 49%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™79°

WindSSE 12 mph

Air QualityPoor

Max UV Index1.0 (Low)

Wind Gusts16 mph

Humidity83%

Indoor Humidity83% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling4800 ft

6 PM

76°
RealFeel® 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 70%
Chevron down
Thunderstorms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™75°

WindWNW 10 mph

Air QualityFair

Max UV Index0.5 (Low)

Wind Gusts15 mph

Humidity84%

Indoor Humidity84% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Rain0.15 in

Visibility4 mi

Cloud Ceiling2000 ft

7 PM

76°
RealFeel® 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 70%
Chevron down
Thunderstorms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™75°

WindNW 9 mph

Air QualityFair

Max UV Index0.3 (Low)

Wind Gusts12 mph

Humidity84%

Indoor Humidity84% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Rain0.15 in

Visibility4 mi

Cloud Ceiling2000 ft

8 PM

75°
RealFeel® 72°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 51%
Chevron down
Thunderstorms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™72°

WindSW 13 mph

Air QualityFair

Max UV Index0.1 (Low)

Wind Gusts14 mph

Humidity88%

Indoor Humidity88% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover93%

Rain0.12 in

Visibility4 mi

Cloud Ceiling2000 ft

9 PM

74°
RealFeel® 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 47%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

WindW 12 mph

Air QualityFair

Wind Gusts13 mph

Humidity84%

Indoor Humidity84% (Very Humid)

Dew Point69° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Visibility10 mi

Cloud Ceiling1700 ft

10 PM

73°
RealFeel® 73°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 39%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

WindWNW 12 mph

Air QualityFair

Wind Gusts13 mph

Humidity88%

Indoor Humidity88% (Very Humid)

Dew Point69° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Visibility10 mi

Cloud Ceiling1100 ft

11 PM

71°
RealFeel® 71°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 32%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

WindWNW 12 mph

Air QualityFair

Wind Gusts12 mph

Humidity88%

Indoor Humidity88% (Very Humid)

Dew Point68° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover92%

Visibility10 mi

Cloud Ceiling800 ft

Hourly Weather Forecast for O'Fallon

AccuWeather's hourly forecast for O'Fallon provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 77° with a RealFeel® of 80°, cloudy with a 49% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

Further Ahead

Tomorrow

Tuesday

10-Day

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Severe Weather

Storms, flood threat persist across central US

1 hour ago

Weather News

Rescues underway, dam fears grow as Arthur floods Gulf Coast homes

2 days ago

Weather News

Next round of record-challenging heat on the way for Pacific Northwest

4 hours ago

Severe Weather

Tornadoes, winds rip through Illinois causing widespread damage

3 days ago
Live Blog

Live: World Cup 2026 weather updates

LATEST ENTRY

USMNT fans’ celebration registers on seismic sensors in Seattle

1 day ago

 More Stories

Featured Stories

Severe Weather

Illinois has already surpassed its record year for tornado reports

3 days ago

Recreation

Black bear injures teen on Washington trail

3 days ago

Astronomy

Meteorological summer vs. astronomical summer explained

3 days ago

Recreation

Free climber dies after falling into volcanic crater in Yemen

4 days ago

Health

Pickle is the pumpkin spice of summer

5 days ago
World North America United States Missouri O'Fallon

Weather Near O'Fallon:

  • St. Charles, MO
  • St. Louis, MO
  • St. Peters, 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

...

...

...