Alton, IL

Hourly

1 PM

85° 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 8% Partly sunny

• RealFeel Shade™: 89°
• Heat Index: 90°
• Wind: SE 6 mph
• Air Quality: Fair
• Max UV Index: 11.0 (Extreme)
• Wind Gusts: 7 mph
• Humidity: 63%
• Indoor Humidity: 63% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 49%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

2 PM

86° 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 47% Intermittent clouds

• RealFeel Shade™: 89°
• Heat Index: 91°
• Wind: SE 6 mph
• Air Quality: Fair
• Max UV Index: 9.9 (Very High)
• Wind Gusts: 7 mph
• Humidity: 61%
• Indoor Humidity: 61% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 52%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

3 PM

86° RealFeel® 91° 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 51% Mostly cloudy w/ t-storms

• RealFeel Shade™: 86°
• Heat Index: 91°
• Wind: SSE 6 mph
• Air Quality: Fair
• Max UV Index: 3.1 (Moderate)
• Wind Gusts: 7 mph
• Humidity: 59%
• Indoor Humidity: 59% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 70%
• Rain: 0.04 in
• Visibility: 6 mi
• Cloud Ceiling: 4000 ft

4 PM

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 47% Intermittent clouds

• RealFeel Shade™: 90°
• Heat Index: 92°
• Wind: SSE 6 mph
• Air Quality: Fair
• Max UV Index: 4.2 (Moderate)
• Wind Gusts: 7 mph
• Humidity: 57%
• Indoor Humidity: 57% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 70%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

5 PM

86° 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 19% Partly sunny

• RealFeel Shade™: 89°
• Heat Index: 91°
• Wind: SSE 7 mph
• Air Quality: Fair
• Max UV Index: 3.4 (Moderate)
• Wind Gusts: 8 mph
• Humidity: 59%
• Indoor Humidity: 59% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 40%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

6 PM

85° RealFeel® 91° 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 19% Mostly sunny

• RealFeel Shade™: 88°
• Heat Index: 89°
• Wind: SSE 7 mph
• Air Quality: Fair
• Max UV Index: 2.1 (Low)
• Wind Gusts: 8 mph
• Humidity: 62%
• Indoor Humidity: 62% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 9 (Very Bright)
• Cloud Cover: 28%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

7 PM

83° 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 13% Mostly sunny

• RealFeel Shade™: 87°
• Heat Index: 88°
• Wind: SSE 7 mph
• Air Quality: Fair
• Max UV Index: 1.2 (Low)
• Wind Gusts: 7 mph
• Humidity: 66%
• Indoor Humidity: 66% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 7 (Bright)
• Cloud Cover: 17%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

8 PM

81° RealFeel® 85° 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 0% Mostly sunny

• RealFeel Shade™: 85°
• Heat Index: 85°
• Wind: SSE 6 mph
• Air Quality: Fair
• Max UV Index: 0.3 (Low)
• Wind Gusts: 7 mph
• Humidity: 69%
• Indoor Humidity: 69% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 2 (Dark)
• Cloud Cover: 11%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

9 PM

78° RealFeel® 82° 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 0% Mostly clear

• Heat Index: 80°
• Wind: SSE 6 mph
• Air Quality: Fair
• Wind Gusts: 7 mph
• Humidity: 77%
• Indoor Humidity: 77% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 11%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

10 PM

76° RealFeel® 79° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 0% Mostly clear

• Wind: SSE 6 mph
• Air Quality: Fair
• Wind Gusts: 6 mph
• Humidity: 85%
• Indoor Humidity: 85% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 11%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

11 PM

74° RealFeel® 78° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 0% Mostly clear

• Wind: SSE 6 mph
• Air Quality: Poor
• Wind Gusts: 6 mph
• Humidity: 88%
• Indoor Humidity: 88% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 11%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft