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Alton, IL

82°F
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Alton

Illinois

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

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10 AM

87°
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.
LEARN MORE
rain drop 0%
Chevron down
Sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday
alerts

Air Quality Alert

2:56 PM Tuesday - 3:00 PM Wednesday

RealFeel Shade™91°

Heat Index93°

WindSW 8 mph

Air QualityFair

Max UV Index3.6 (Moderate)

Wind Gusts12 mph

Humidity61%

Indoor Humidity61% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover5%

Visibility10 mi

Cloud Ceiling30000 ft

11 AM

90°
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.
LEARN MORE
rain drop 0%
Chevron down
Sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday
alerts

Air Quality Alert

2:56 PM Tuesday - 3:00 PM Wednesday

RealFeel Shade™92°

Heat Index96°

WindSW 8 mph

Air QualityPoor

Max UV Index4.8 (Moderate)

Wind Gusts13 mph

Humidity52%

Indoor Humidity52% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover5%

Visibility10 mi

Cloud Ceiling30000 ft

12 PM

94°
RealFeel® 102°
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.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday
alerts

Air Quality Alert

2:56 PM Tuesday - 3:00 PM Wednesday

RealFeel Shade™95°

Heat Index99°

WindSW 8 mph

Air QualityPoor

Max UV Index6.4 (High)

Wind Gusts14 mph

Humidity45%

Indoor Humidity45% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

1 PM

96°
RealFeel® 104°
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.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday
alerts

Air Quality Alert

2:56 PM Tuesday - 3:00 PM Wednesday

RealFeel Shade™97°

Heat Index101°

WindSW 8 mph

Air QualityFair

Max UV Index7.1 (High)

Wind Gusts15 mph

Humidity41%

Indoor Humidity41% (Very Humid)

Dew Point69° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover16%

Visibility10 mi

Cloud Ceiling30000 ft

2 PM

97°
RealFeel® 104°
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.
LEARN MORE
rain drop 7%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday
alerts

Air Quality Alert

2:56 PM Tuesday - 3:00 PM Wednesday

RealFeel Shade™98°

Heat Index103°

WindSW 8 mph

Air QualityFair

Max UV Index6.4 (High)

Wind Gusts14 mph

Humidity39%

Indoor Humidity39% (Very Humid)

Dew Point68° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover19%

Visibility10 mi

Cloud Ceiling30000 ft

3 PM

99°
RealFeel® 104°
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.
LEARN MORE
rain drop 7%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

RealFeel Shade™99°

Heat Index104°

WindSW 8 mph

Air QualityFair

Max UV Index4.8 (Moderate)

Wind Gusts14 mph

Humidity36%

Indoor Humidity36% (Very Humid)

Dew Point68° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover19%

Visibility10 mi

Cloud Ceiling30000 ft

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.
LEARN MORE
rain drop 7%
Chevron down
Intermittent clouds
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

RealFeel Shade™98°

Heat Index102°

WindSW 8 mph

Air QualityFair

Max UV Index3.1 (Moderate)

Wind Gusts13 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.
LEARN MORE
rain drop 7%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

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.
LEARN MORE
rain drop 7%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

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.
LEARN MORE
rain drop 5%
Chevron down
Mostly sunny
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

RealFeel Shade™95°

Heat Index98°

WindSSE 6 mph

Air QualityPoor

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® 93°
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.
LEARN MORE
rain drop 0%
Chevron down
Mostly clear
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index95°

WindSSE 6 mph

Air QualityPoor

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

86°
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.
LEARN MORE
rain drop 0%
Chevron down
Clear
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index92°

WindS 6 mph

Air QualityPoor

Wind Gusts9 mph

Humidity61%

Indoor Humidity61% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover6%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

84°
RealFeel® 88°
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
rain drop 0%
Chevron down
Clear
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index88°

WindS 6 mph

Air QualityPoor

Wind Gusts12 mph

Humidity67%

Indoor Humidity67% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover2%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

82°
RealFeel® 86°
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
rain drop 0%
Chevron down
Clear
alerts

Heat Advisory

12:00 PM Monday - 8:00 PM Saturday

Heat Index86°

WindS 6 mph

Air QualityPoor

Wind Gusts9 mph

Humidity72%

Indoor Humidity72% (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 87° with a RealFeel® of 95°, sunny with a 0% 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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