Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™

Williamson, IL

20°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Williamson

Illinois

20°
No results found.
Try searching for a city, zip code or point of interest.
Create Account Unlock extended daily forecasts and additional saved locations — all with your free account.
Let's Go Chevron right
Have an account already? Login
settings
Williamson, IL 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
Monday, January 19

Current Weather

4:35 AM

20°F
Clear
RealFeel® 7°
Bitterly Cold
RealFeel Guide
Bitterly Cold
-10° to 9°
Caution advised. Frostbite to exposed skin within 15 minutes. Hypothermia likely without protective clothing.
LEARN MORE
RealFeel®
7°
Wind
NNW 11 mph
Wind Gusts
21 mph
Humidity
60%
Indoor Humidity
23% (Very Dry)
Dew Point
9° F
Pressure
↑ 30.17 in
Cloud Cover
0%
Visibility
24 mi
Cloud Ceiling
40000 ft

Day

1/19
20°Hi
RealFeel® 10°
Very Cold
RealFeel Guide
Very Cold
10° to 24°
Caution advised. Older adults, infants, and those with sensitive medical conditions, should be well dressed to protect from hypothermia and frostbite. Coat, hat, gloves and a scarf are appropriate.
LEARN MORE
RealFeel Shade™ 10°
Very Cold
RealFeel Guide
Very Cold
10° to 24°
Caution advised. Older adults, infants, and those with sensitive medical conditions, should be well dressed to protect from hypothermia and frostbite. Coat, hat, gloves and a scarf are appropriate.
LEARN MORE
Mostly sunny, breezy and very cold
alerts

Cold Weather Advisory

3:00 AM Monday - 10:00 AM Monday

Max UV Index3.0 (Moderate)

AccuLumen Brightness Index™9 (Very Bright)

WindWNW 15 mph

Wind Gusts31 mph

Probability of Precipitation0%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover11%

Morning

Afternoon

Night

1/19
12°Lo
RealFeel® 8°
Bitterly Cold
RealFeel Guide
Bitterly Cold
-10° to 9°
Caution advised. Frostbite to exposed skin within 15 minutes. Hypothermia likely without protective clothing.
LEARN MORE
Clear to partly cloudy and cold

WindSW 6 mph

Wind Gusts7 mph

Probability of Precipitation2%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover27%

Evening

Overnight

Sun & Moon

9 hrs 50 mins
Rise 7:15 AM
Set 5:05 PM
Waxing Crescent
Rise 8:01 AM
Set 6:03 PM

Temperature History

1/19
High
Low
Forecast
20°
12°
Average
38°
21°
Last Year
20°
1°

Further Ahead

Hourly

Daily

Monthly

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Winter Weather

Stormy late-January setup raises risk for snow and ice impacts

1 hour ago

Climate

Western US faces worsening snow drought, with California the exception

2 days ago

Winter Weather

Clipper storm to spread snow over Upper Midwest, Northeast

14 hours ago

Winter Weather

1 dead after 5 pileups on snowy roads in New York, Pennsylvania

2 days ago

Weather Forecasts

Dry, warm weather to hold west of Rockies, but fog may cause problems

15 hours ago

 More Stories

Featured Stories

Climate

Why this famous iceberg turned blue and what it says about melting ice

2 days ago

Astronomy

NASA to roll out Artemis II rocket ahead of astronaut moon launch

2 days ago

Recreation

Death of 2 Florida students highlights risks of sand collapse

3 days ago

Astronomy

March’s total lunar eclipse will turn the moon red, here’s when to see...

4 days ago

Recreation

Rare and majestic sand sculptures only exist for minutes

2 days ago
World North America United States Illinois Williamson

Weather Near Williamson:

  • 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 RealFeel® and RealFeel Shade™ 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 RealFeel® and RealFeel Shade™ 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

...

...

...