Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
West faces hottest weather so far this year as heat dome builds. Click for the forecast. Chevron right

Alton, IL

84°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Alton

Illinois

84°
No results found.
Try searching for a city, zip code or point of interest.
Get Premium+
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
Alton, IL 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

Unlock extended 90-day forecasts

Activate Your Premium+ Subscription

Chevron right

July 8 - July 22

Wed 7/8

87° /70°
55%
Humid with sunshine interrupted by clouds at times; a thunderstorm in spots this afternoon

RealFeel®104°

RealFeel Shade™94°

Max UV Index11.0 (Extreme)

WindSE 5 mph

Hours of Precipitation0.5

Hours of Rain0.5

Thu 7/9

88° /72°
80%
Humid with intervals of bright sunshine; a heavy thunderstorm in the afternoon; thunderstorms can bring flooding downpours, hail and damaging wind gusts

RealFeel®99°

RealFeel Shade™92°

Max UV Index10.0 (Very High)

WindSW 8 mph

Hours of Precipitation1

Hours of Rain1

Fri 7/10

84° /71°
88%
Humid with a couple of showers and a thunderstorm; cloudy in the morning, then intervals of bright sunshine in the afternoon

RealFeel®94°

RealFeel Shade™88°

Max UV Index5.0 (Moderate)

WindW 7 mph

Hours of Precipitation3

Hours of Rain3

Sat 7/11

84° /67°
55%
Cloudy and humid with widely separated thunderstorms

RealFeel®91°

RealFeel Shade™88°

Max UV Index4.0 (Moderate)

WindNE 7 mph

Hours of Precipitation1

Hours of Rain1

Sun 7/12

86° /66°
9%
Mostly sunny and humid

RealFeel®96°

RealFeel Shade™88°

Max UV Index11.0 (Extreme)

WindNE 8 mph

Mon 7/13

86° /70°
6%
Nice with plenty of sunshine

RealFeel®93°

RealFeel Shade™88°

Max UV Index11.0 (Extreme)

WindNE 8 mph

Tue 7/14

90° /70°
9%
Uncomfortably humid with sunshine

RealFeel®105°

RealFeel Shade™97°

Max UV Index11.0 (Extreme)

WindE 4 mph

Wed 7/15

93° /72°
49%
A morning shower in the area; otherwise, mostly sunny and hot

RealFeel®106°

RealFeel Shade™97°

Max UV Index11.0 (Extreme)

WindN 1 mph

Hours of Precipitation1

Hours of Rain1

Thu 7/16

91° /71°
2%
Partly sunny and humid

RealFeel®105°

RealFeel Shade™95°

Max UV Index11.0 (Extreme)

WindNW 1 mph

Fri 7/17

90° /71°
1%
Wall-to-wall sunshine

RealFeel®101°

RealFeel Shade™91°

Max UV Index11.0 (Extreme)

WindSSE 2 mph

Sat 7/18

91° /68°
2%
Sun through high clouds and humid

RealFeel®97°

RealFeel Shade™95°

Max UV Index7.0 (High)

WindWSW 9 mph

Sun 7/19

90° /71°
55%
Occasional rain in the morning; otherwise, mostly cloudy and humid

RealFeel®101°

RealFeel Shade™98°

Max UV Index10.0 (Very High)

WindSW 7 mph

Hours of Precipitation1

Hours of Rain1

Mon 7/20

90° /69°
55%
Mostly cloudy and uncomfortably humid; a little afternoon rain

RealFeel®106°

RealFeel Shade™96°

Max UV Index11.0 (Extreme)

WindNW 7 mph

Hours of Precipitation1

Hours of Rain1

Tue 7/21

86° /68°
63%
A couple of morning showers; otherwise, decreasing clouds and very humid

RealFeel®101°

RealFeel Shade™93°

Max UV Index8.0 (Very High)

WindENE 8 mph

Hours of Precipitation1

Hours of Rain1

Wed 7/22

85° /66°
10%
Mostly sunny

RealFeel®90°

RealFeel Shade™83°

Max UV Index10.0 (Very High)

WindENE 6 mph

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Hurricane

Atlantic hurricane season off to a slow start as El Niño strengthens

6 hours ago

Severe Weather

Tornado in Alaska? Video shows rare funnel cloud in remote landscape

1 day ago

Weather Forecasts

Heat dome to broil western U.S. ahead of North America monsoon

6 hours ago
Live Blog

Live: World Cup 2026 weather updates

LATEST ENTRY

Quarterfinals to commence with heat on Thursday

1 day ago

Severe Weather

Storms with flooding, high winds poised in central and southeastern US

6 hours ago

 More Stories

Featured Stories

Severe Weather

Storms, heat and floods disrupt America’s 250th birthday celebrations

1 day ago

Health

NYC Legionnaires' disease outbreak jumps to 14 confirmed cases

2 days ago

Weather News

Mother dies trying to save son from Tennessee floodwaters

2 days ago

Travel

Plane makes hard landing into New York’s East River, officials say

2 days ago

Weather News

Toll from Venezuela earthquakes rises to 3,342, more than 16K injured

1 day 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 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

...

...

...