Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Summer is around the corner. Here's what AccuWeather is calling for across the U.S. Chevron right
Polar vortex is linked to the next chill, frost coming to the eastern U.S. See the forecast. Chevron right

O'Fallon, MO

50°F
Location Chevron down
Location News Videos
Use Current Location
Recent

O'Fallon

Missouri

50°
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 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

Today's Weather

Fri, May 1

Cool with sunshine mixing with some clouds Hi: 61°

Tonight: Mostly cloudy and chilly with a shower in the area Lo: 42°

Current Weather

8:38 AM

50°F
RealFeel® 59°
Sunny More Details
RealFeel Shade™ 52°
Wind NNW 2 mph
Wind Gusts 5 mph
Air Quality Excellent

Looking Ahead

A thundershower Sunday evening

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

9 AM 49°
rain drop 0%
10 AM 53°
rain drop 0%
11 AM 56°
rain drop 0%
12 PM 58°
rain drop 0%
1 PM 59°
rain drop 0%
2 PM 60°
rain drop 0%
3 PM 61°
rain drop 0%
4 PM 60°
rain drop 0%
5 PM 60°
rain drop 0%
6 PM 59°
rain drop 0%
7 PM 58°
rain drop 0%
8 PM 55°
rain drop 35%

10-Day Weather Forecast

Today

5/1

61° 42°

Cool with sun, some clouds

Night: Mostly cloudy with a shower
2%

Sat

5/2

60° 40°

Partly sunny, a shower; cool

Clear and chilly
55%

Sun

5/3

76° 53°

Mostly sunny; breezy, warmer

A t-shower in spots early
25%

Mon

5/4

76° 56°

Breezy; an afternoon t-storm

Cloudy, a shower and t-storm
55%

Tue

5/5

63° 44°

Cooler with a few showers

Cloudy and chilly
89%

Wed

5/6

61° 42°

Cloudy, a shower in the p.m.

Rather cloudy, a shower late
55%

Thu

5/7

63° 43°

Some sun with a shower

Mostly cloudy
55%

Fri

5/8

69° 51°

Decreasing clouds

Clear
6%

Sat

5/9

72° 52°

Sunshine

Clear to partly cloudy
0%

Sun

5/10

73° 52°

Sun through high clouds

Partly cloudy
0%

Sun & Moon

13 hrs 50 mins
Rise 6:05 AM
Set 7:55 PM
Full Moon
Rise 8:21 PM
Set 6:08 AM

Air Quality

See More
Air Quality Excellent

The air quality is ideal for most individuals; enjoy your normal outdoor activities.

Allergy Outlook

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

Top Stories

Weather News

Camp Mystic halts plans to reopen this summer

1 hour ago

Winter Weather

Polar vortex aftermath to bring chilly May days to Midwest, Northeast

50 minutes ago

Severe Weather

Monster 7-inch hailstone confirmed as Texas state record

19 hours ago

Weather Forecasts

Summer forecast: Heat, storms to shape the season as El Niño develops

13 hours ago

Weather Forecasts

Rain to douse southern U.S. wildfire risk, ease drought into weekend

9 minutes ago

 More Stories

Featured Stories

Astronomy

May's biggest astronomy events include shooting stars, rare Blue Moon

57 minutes ago

Severe Weather

Tornado survivor recalls emerging from storm shelter in Oklahoma

1 day ago

Astronomy

SpaceX rocket debris is on a collision course with the moon

19 hours ago

Weather News

Humpback whale 'Timmy' guided to safety in rescue off Germany’s coast

1 day ago

Astronomy

2 full moons will light up May 2026, including a rare blue moon

3 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

...

...

...