Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Historic Thanksgiving travel surge collides with coast-to-coast storm. See the forecast. Chevron right
Atmospheric river to drench Pacific Northwest Thanksgiving Week. Get the forecast. Chevron right

Alton, IL

46°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Alton

Illinois

46°
No results found.
Try searching for a city, zip code or point of interest.
settings
Alton, 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

12 AM

46°
RealFeel® 41°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 44%
Chevron down
Showers
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 7 mph

Air QualityPoor

Wind Gusts8 mph

Humidity98%

Indoor Humidity44% (Ideal Humidity)

Dew Point45° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover100%

Visibility10 mi

Cloud Ceiling20000 ft

1 AM

46°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 1%
Chevron down
Cloudy
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 7 mph

Air QualityPoor

Wind Gusts8 mph

Humidity96%

Indoor Humidity43% (Ideal Humidity)

Dew Point45° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover100%

Visibility10 mi

Cloud Ceiling20000 ft

2 AM

45°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Intermittent clouds
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 6 mph

Air QualityPoor

Wind Gusts7 mph

Humidity92%

Indoor Humidity41% (Ideal Humidity)

Dew Point43° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover50%

Visibility10 mi

Cloud Ceiling30000 ft

3 AM

45°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Intermittent clouds
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 6 mph

Air QualityPoor

Wind Gusts7 mph

Humidity94%

Indoor Humidity40% (Ideal Humidity)

Dew Point43° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover58%

Visibility10 mi

Cloud Ceiling30000 ft

4 AM

45°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Intermittent clouds
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 6 mph

Air QualityPoor

Wind Gusts7 mph

Humidity92%

Indoor Humidity40% (Ideal Humidity)

Dew Point43° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover65%

Visibility10 mi

Cloud Ceiling22400 ft

5 AM

45°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Mostly cloudy
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 7 mph

Air QualityPoor

Wind Gusts8 mph

Humidity92%

Indoor Humidity40% (Ideal Humidity)

Dew Point43° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover77%

Visibility4 mi

Cloud Ceiling20600 ft

6 AM

46°
RealFeel® 41°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Cloudy
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

WindSSE 7 mph

Air QualityPoor

Wind Gusts8 mph

Humidity91%

Indoor Humidity41% (Ideal Humidity)

Dew Point43° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Visibility2 mi

Cloud Ceiling18800 ft

7 AM

46°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 5%
Chevron down
Fog
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

RealFeel Shade™42°

WindSSE 7 mph

Air QualityPoor

Max UV Index0.0 (Low)

Wind Gusts8 mph

Humidity90%

Indoor Humidity41% (Ideal Humidity)

Dew Point44° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover94%

Visibility0.50 mi

Cloud Ceiling500 ft

8 AM

48°
RealFeel® 43°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 5%
Chevron down
Fog
alerts

Dense Fog Advisory

6:00 PM Sunday - 9:00 AM Monday

RealFeel Shade™43°

WindSSE 8 mph

Air QualityPoor

Max UV Index0.2 (Low)

Wind Gusts9 mph

Humidity89%

Indoor Humidity43% (Ideal Humidity)

Dew Point44° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover94%

Visibility0.50 mi

Cloud Ceiling500 ft

9 AM

50°
RealFeel® 45°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 6%
Chevron down
Fog

RealFeel Shade™45°

WindSSE 8 mph

Air QualityPoor

Max UV Index0.4 (Low)

Wind Gusts10 mph

Humidity85%

Indoor Humidity44% (Ideal Humidity)

Dew Point45° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility0.50 mi

Cloud Ceiling500 ft

10 AM

51°
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 7%
Chevron down
Fog

RealFeel Shade™46°

WindSSE 9 mph

Air QualityPoor

Max UV Index0.5 (Low)

Wind Gusts13 mph

Humidity80%

Indoor Humidity44% (Ideal Humidity)

Dew Point45° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility1.00 mi

Cloud Ceiling1000 ft

11 AM

53°
RealFeel® 48°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 7%
Chevron down
Fog

RealFeel Shade™48°

WindSSE 9 mph

Air QualityPoor

Max UV Index0.6 (Low)

Wind Gusts13 mph

Humidity77%

Indoor Humidity44% (Ideal Humidity)

Dew Point46° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility2 mi

Cloud Ceiling1500 ft

12 PM

54°
RealFeel® 49°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 11%
Chevron down
Fog

RealFeel Shade™49°

WindSSE 10 mph

Air QualityPoor

Max UV Index0.7 (Low)

Wind Gusts13 mph

Humidity75%

Indoor Humidity45% (Ideal Humidity)

Dew Point46° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility4 mi

Cloud Ceiling2000 ft

1 PM

55°
RealFeel® 50°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 17%
Chevron down
Cloudy

RealFeel Shade™50°

WindSSE 12 mph

Air QualityPoor

Max UV Index0.9 (Low)

Wind Gusts14 mph

Humidity73%

Indoor Humidity45% (Ideal Humidity)

Dew Point46° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility10 mi

Cloud Ceiling13700 ft

2 PM

56°
RealFeel® 51°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 17%
Chevron down
Cloudy

RealFeel Shade™51°

WindSSE 12 mph

Air QualityPoor

Max UV Index0.7 (Low)

Wind Gusts16 mph

Humidity70%

Indoor Humidity45% (Ideal Humidity)

Dew Point46° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility10 mi

Cloud Ceiling8700 ft

3 PM

55°
RealFeel® 49°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 22%
Chevron down
Cloudy

RealFeel Shade™49°

WindSSE 13 mph

Air QualityPoor

Max UV Index0.4 (Low)

Wind Gusts18 mph

Humidity73%

Indoor Humidity45% (Ideal Humidity)

Dew Point46° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover94%

Visibility10 mi

Cloud Ceiling3700 ft

4 PM

54°
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 51%
Chevron down
Showers

RealFeel Shade™46°

WindSSE 12 mph

Air QualityPoor

Max UV Index0.2 (Low)

Wind Gusts18 mph

Humidity77%

Indoor Humidity46% (Ideal Humidity)

Dew Point47° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover94%

Rain0.02 in

Visibility7 mi

Cloud Ceiling3100 ft

5 PM

53°
RealFeel® 48°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 47%
Chevron down
Cloudy

WindSSE 9 mph

Air QualityPoor

Wind Gusts18 mph

Humidity81%

Indoor Humidity47% (Ideal Humidity)

Dew Point47° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover94%

Visibility10 mi

Cloud Ceiling2500 ft

6 PM

52°
RealFeel® 47°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 45%
Chevron down
Cloudy

WindSSE 8 mph

Air QualityPoor

Wind Gusts18 mph

Humidity85%

Indoor Humidity47% (Ideal Humidity)

Dew Point47° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover94%

Visibility10 mi

Cloud Ceiling2000 ft

7 PM

51°
RealFeel® 47°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 47%
Chevron down
Cloudy

WindSSE 8 mph

Air QualityPoor

Wind Gusts16 mph

Humidity89%

Indoor Humidity48% (Ideal Humidity)

Dew Point48° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover99%

Visibility10 mi

Cloud Ceiling1500 ft

8 PM

51°
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 49%
Chevron down
Cloudy

WindSSE 8 mph

Air QualityPoor

Wind Gusts15 mph

Humidity90%

Indoor Humidity48% (Ideal Humidity)

Dew Point48° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover99%

Visibility10 mi

Cloud Ceiling1000 ft

9 PM

50°
RealFeel® 43°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 55%
Chevron down
Showers

WindSSE 8 mph

Air QualityPoor

Wind Gusts14 mph

Humidity92%

Indoor Humidity49% (Ideal Humidity)

Dew Point48° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover99%

Rain0.08 in

Visibility5 mi

Cloud Ceiling500 ft

10 PM

50°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 51%
Chevron down
Showers

WindSSE 8 mph

Air QualityPoor

Wind Gusts12 mph

Humidity95%

Indoor Humidity49% (Ideal Humidity)

Dew Point48° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover99%

Rain0.08 in

Visibility5 mi

Cloud Ceiling500 ft

11 PM

50°
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 47%
Chevron down
Cloudy

WindSSE 8 mph

Air QualityPoor

Wind Gusts9 mph

Humidity95%

Indoor Humidity50% (Ideal Humidity)

Dew Point49° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover99%

Visibility10 mi

Cloud Ceiling500 ft

Further Ahead

Tomorrow

Tuesday

Daily

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Travel

Historic Thanksgiving travel surge collides with coast-to-coast storm

9 hours ago

Hurricane

Atlantic season to end with no US hurricane landfalls

2 days ago

Weather News

Hidden magma movements behind Santorini earthquake swarm, study finds

2 days ago

Weather Forecasts

Atmospheric river to soak Pacific Northwest through Thanksgiving week

12 hours ago

Weather Forecasts

Storm to target the Plains with flood threat & damaging thunderstorms

9 hours ago

 More Stories

Featured Stories

Astronomy

Moss survives exposure to space in space station experiment

2 days ago

Weather News

Earthquake strikes Bangladesh, leaves 7 dead

2 days ago

Weather News

Retired fire captain recalls harrowing fight against Eaton Fire

3 days ago

Winter Weather

It snowed in Hawaii this week, while Denver, Boston wait for 1st flake

4 days ago

Weather News

Indonesia volcano eruption sends deadly ash cloud over nearby town

4 days ago
World North America United States Illinois Alton

Weather Near Alton:

  • 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
© 2025 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | Do Not Sell My Data checkmark Confirmed Not Selling Your Data | Data Sources

...

...

...