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Alton, IL Weather

Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Hourly

10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

View hourly forecasts 10-days ahead

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4 PM

98°

RealFeel® 101°

Very Hot

RealFeel Guide

Very Hot

101° to 107°

Caution advised. Danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

7%

Intermittent clouds

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Air Quality Alert

2:56 PM Tuesday - 8:00 PM Wednesday

RealFeel Shade™98°

Heat Index103°

WindSW 8 mph

Air QualityFair

Max UV Index3.1 (Moderate)

Wind Gusts12 mph

Humidity37%

Indoor Humidity37% (Very Humid)

Dew Point68° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling30000 ft

5 PM

96°

RealFeel® 100°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

7%

Mostly sunny

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Air Quality Alert

2:56 PM Tuesday - 8:00 PM Wednesday

RealFeel Shade™97°

Heat Index101°

WindSW 8 mph

Air QualityFair

Max UV Index2.3 (Low)

Wind Gusts9 mph

Humidity39%

Indoor Humidity39% (Very Humid)

Dew Point68° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover18%

Visibility10 mi

Cloud Ceiling30000 ft

6 PM

95°

RealFeel® 98°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

7%

Mostly sunny

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Air Quality Alert

2:56 PM Tuesday - 8:00 PM Wednesday

RealFeel Shade™97°

Heat Index100°

WindS 7 mph

Air QualityFair

Max UV Index1.4 (Low)

Wind Gusts8 mph

Humidity42%

Indoor Humidity42% (Very Humid)

Dew Point69° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover17%

Visibility10 mi

Cloud Ceiling30000 ft

7 PM

92°

RealFeel® 95°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

5%

Mostly sunny

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Air Quality Alert

2:56 PM Tuesday - 8:00 PM Wednesday

RealFeel Shade™95°

Heat Index98°

WindSSE 6 mph

Air QualityFair

Max UV Index0.4 (Low)

Wind Gusts7 mph

Humidity49%

Indoor Humidity49% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover14%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

89°

RealFeel® 92°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

0%

Mostly clear

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index94°

WindS 6 mph

Air QualityFair

Wind Gusts7 mph

Humidity55%

Indoor Humidity55% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

85°

RealFeel® 90°

Hot

RealFeel Guide

Hot

90° to 100°

Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

0%

Clear

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index91°

WindS 6 mph

Air QualityFair

Wind Gusts9 mph

Humidity63%

Indoor Humidity63% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover6%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

82°

RealFeel® 87°

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.

0%

Clear

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index87°

WindSSE 6 mph

Air QualityFair

Wind Gusts12 mph

Humidity71%

Indoor Humidity71% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover2%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

79°

RealFeel® 84°

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.

0%

Clear

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index80°

WindSSE 6 mph

Air QualityFair

Wind Gusts9 mph

Humidity79%

Indoor Humidity79% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover1%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for Alton

AccuWeather's hourly forecast for Alton provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 98° with a RealFeel® of 101°, intermittent clouds with a 7% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

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