Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
El Nino to play a major role this hurricane season. Here's how many storms AccuWeather experts are predicting. Chevron right

O'Fallon, MO

33°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Missouri

33°
No results found.
Try searching for a city, zip code or point of interest.
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 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
Freeze Warning

Today's Weather

Sat, Mar 28

Plenty of sun Hi: 57°

Tonight: Breezy this evening; otherwise, partly cloudy Lo: 39°

Current Weather

5:52 AM

33°F
RealFeel® 35°
Clear More Details
Wind N 2 mph
Wind Gusts 6 mph
Air Quality Fair

Looking Ahead

Watch for a strong thunderstorm Tuesday night; storms can bring hail and damaging winds

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

6 AM 31°
rain drop 0%
7 AM 29°
rain drop 0%
8 AM 31°
rain drop 0%
9 AM 35°
rain drop 0%
10 AM 39°
rain drop 0%
11 AM 43°
rain drop 0%
12 PM 47°
rain drop 0%
1 PM 49°
rain drop 0%
2 PM 52°
rain drop 0%
3 PM 55°
rain drop 0%
4 PM 56°
rain drop 0%
5 PM 57°
rain drop 0%

10-Day Weather Forecast

Today

3/28

57° 39°

Plenty of sun

Night: Breezy early; partly cloudy
0%

Sun

3/29

73° 56°

Partly sunny and warmer

Partly cloudy
0%

Mon

3/30

86° 64°

Mostly sunny; windy, warmer

Partly cloudy and breezy
2%

Tue

3/31

88° 46°

Windy and remaining very warm

Cooler with a strong t-storm
25%

Wed

4/1

50° 43°

Clouds and sun; much colder

A shower early, then rain
25%

Thu

4/2

52° 42°

Cool with periods of rain

Cloudy with a shower late
60%

Fri

4/3

64° 55°

Times of clouds and sun

Mostly cloudy
25%

Sat

4/4

70° 47°

Cloudy, afternoon showers

Rain and a thunderstorm late
61%

Sun

4/5

64° 41°

Rain and a thunderstorm

Rain, then a shower
70%

Mon

4/6

57° 41°

A bit of rain in the morning

Mainly clear
49%

Sun & Moon

12 hrs 28 mins
Rise 6:54 AM
Set 7:22 PM
Waxing Gibbous
Rise 2:59 PM
Set 5:13 AM

Air Quality

See More
Air Quality Fair

The air quality is generally acceptable for most individuals. However, sensitive groups may experience minor to moderate symptoms from long-term exposure.

Allergy Outlook

See All
Tree Pollen Moderate Data is not supported in this location Ragweed Pollen Low 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 High Data is not supported in this location

Top Stories

Weather Forecasts

Pacific storms to snap record heat wave in western U.S. next week

54 minutes ago

Astronomy

Artemis II: What to know about this historic moon mission

15 hours ago

Severe Weather

Severe weather risk to accompany next warmup in Midwest

55 minutes ago

Hurricane

Atlantic hurricane season forecast 2026: 11-16 named storms predicted

3 days ago

Astronomy

April's back-to-back astronomy events include 1st meteor shower in mon...

18 hours ago

 More Stories

Featured Stories

Economic Impact

Gas prices surge nearly $1 in a month as EV charging holds steady

17 hours ago

Recreation

DC cherry blossoms reach peak bloom early

1 day ago

Astronomy

April’s full Pink moon rises April 1: Here’s when to watch

16 hours ago

Sports

The hidden story behind the invention of basketball

17 hours ago

Astronomy

What’s behind the recent spike in meteor sightings across the US?

17 hours 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

...

...

...