Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
A new storm is lurking in the Pacific, which could bring flooding to Hawaii. Click for details. Chevron right
Halloween forecast: See where trick-or-treaters will need an umbrella. Chevron right

O'Fallon, MO

71°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Missouri

71°
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
Sunday, October 25

Day

10/25
78°Hi
RealFeel® 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
RealFeel Shade™ 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
High thin cloudiness and warm; a nice end to the weekend

Max UV Index4.0 (Moderate)

AccuLumen Brightness Index™8 (Bright)

WindSE 5 mph

Wind Gusts6 mph

Probability of Precipitation3%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover51%

Morning

Afternoon

Night

10/25
49°Lo
RealFeel® 50°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
Partly cloudy

WindSSE 5 mph

Wind Gusts5 mph

Probability of Precipitation3%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover26%

Evening

Overnight

Sun & Moon

10 hrs 49 mins
Rise 7:22 AM
Set 6:11 PM
Full Moon
Rise 5:38 PM
Set 8:02 AM

Temperature History

10/25
High
Low
Forecast
78°
49°
Average
66°
43°
Last Year
59°
51°

Further Ahead

Hourly

10-Day

Monthly

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Weather Forecasts

Halloween forecast 2026: Who gets rain, storms and chilly weather

3 hours ago

Weather Forecasts

UK faces back-to-back storms as Josephine could help fuel a third

3 hours ago

Hurricane

Atlantic may have another tropical trick ahead of Halloween

3 hours ago

Hurricane

Tropical downpours may lead to flooding in Hawaii during late-October

6 hours ago

Winter Weather

Storm packing flooding rain, severe weather to end as snow in Dakotas

3 hours ago

 More Stories

Featured Stories

Weather News

Sunsets before 5 p.m. are about to return as daylight saving time ends

1 day ago

Weather News

6 spooky sights from nature to give you chills this Halloween

2 days ago

Climate

Can California save its El Niño water windfall?

1 day ago

Astronomy

Hunter Moon, Saturn and shooting stars share the sky this weekend

1 day ago

Recreation

New Hampshire’s ‘hanging boulder’ falls after a century

2 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

...

...

...