Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Heat wave to intensify as all-time March records fall across the West. See how hot it will get. Chevron right

St. Clair, MO

55°F
Location Chevron down
Location News Videos
Use Current Location
Recent

St. Clair

Missouri

55°
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
St. Clair, 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
Friday, March 20

Current Weather

9:09 AM

55°F
Sunny
RealFeel® 63°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
RealFeel Shade™ 56°
Cool
RealFeel Guide
Cool
53° to 62°
Light jacket or sweater may be appropriate.
LEARN MORE
RealFeel®
63°
RealFeel Shade™
56°
Max UV Index
2.9 (Moderate)
Wind
W 2 mph
Wind Gusts
6 mph
Humidity
81%
Indoor Humidity
51% (Ideal Humidity)
Dew Point
49° F
Pressure
↔ 29.95 in
Cloud Cover
0%
Visibility
14 mi
Cloud Ceiling
33400 ft

Day

3/20
83°Hi
RealFeel® 85°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
RealFeel Shade™ 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
Partly sunny and very warm

Max UV Index5.0 (Moderate)

AccuLumen Brightness Index™9 (Very Bright)

WindW 8 mph

Wind Gusts24 mph

Probability of Precipitation0%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover23%

Morning

Afternoon

Night

3/20
50°Lo
RealFeel® 50°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
Mainly clear

WindENE 5 mph

Wind Gusts6 mph

Probability of Precipitation1%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover11%

Evening

Overnight

Sun & Moon

12 hrs 08 mins
Rise 7:08 AM
Set 7:16 PM
Waxing Crescent
Rise 7:44 AM
Set 9:32 PM

Temperature History

3/20
High
Low
Forecast
83°
50°
Average
59°
36°
Last Year
49°
29°

Further Ahead

Hourly

Daily

Monthly

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Weather Forecasts

Western heat wave shatters March records, to expand with more extremes

4 hours ago

Weather Forecasts

Hawaii braces for second kona storm in a week with renewed flooding

3 hours ago

Astronomy

Man finds possible meteorite after fireball streaks across 12 states

21 hours ago

Hurricane

Tropical Cyclone Narelle will rapidly intensify, hit Australia 3 times

4 hours ago

Weather Forecasts

Spring arrives Friday, and with it comes the next warmup for millions

4 hours ago

 More Stories

Featured Stories

Astronomy

Astronauts enter quarantine; NASA set to roll moon rocket out

20 hours ago

Recreation

Death Valley's superbloom, ancient lake are disappearing

2 hours ago

Recreation

Top 10 National Parks of 2025 revealed

21 hours ago

Severe Weather

100 years ago: The deadliest tornado in US history claimed 695 lives

2 days ago

Weather News

Watch the rescue: Coast Guard saves snowmobiler stranded on ice

2 days ago
World North America United States Missouri St. Clair

Weather Near St. Clair:

  • 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 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

...

...

...