Herndon, VA

Hourly

2 PM

92° RealFeel® 108° Dangerous Heat RealFeel Guide Dangerous Heat 108° to 115° 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 43% Intermittent clouds

• RealFeel Shade™: 99°
• Wind: SE 7 mph
• Air Quality: Fair
• Max UV Index: 9 (Very High)
• Wind Gusts: 15 mph
• Humidity: 58%
• Indoor Humidity: 58% (Extremely Humid)
• Dew Point: 76° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 52%
• Visibility: 10 mi
• Cloud Ceiling: 20000 ft

3 PM

92° RealFeel® 105° 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 47% Partly sunny

• RealFeel Shade™: 97°
• Wind: SE 7 mph
• Air Quality: Fair
• Max UV Index: 7 (High)
• Wind Gusts: 16 mph
• Humidity: 56%
• Indoor Humidity: 56% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 48%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

4 PM

91° RealFeel® 97° 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™: 94°
• Wind: SE 7 mph
• Air Quality: Fair
• Max UV Index: 2 (Low)
• Wind Gusts: 18 mph
• Humidity: 59%
• Indoor Humidity: 59% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 70%
• Rain: 0.04 in
• Visibility: 6 mi
• Cloud Ceiling: 4000 ft

5 PM

89° 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 14% Intermittent clouds

• RealFeel Shade™: 94°
• Wind: ESE 7 mph
• Air Quality: Fair
• Max UV Index: 3 (Moderate)
• Wind Gusts: 18 mph
• Humidity: 60%
• Indoor Humidity: 60% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 70%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

6 PM

88° RealFeel® 96° 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 10% Intermittent clouds

• RealFeel Shade™: 93°
• Wind: SE 7 mph
• Air Quality: Fair
• Max UV Index: 2 (Low)
• Wind Gusts: 18 mph
• Humidity: 62%
• Indoor Humidity: 62% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 69%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

7 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 14% Partly sunny

• RealFeel Shade™: 91°
• Wind: SE 7 mph
• Air Quality: Fair
• Max UV Index: 1 (Low)
• Wind Gusts: 16 mph
• Humidity: 67%
• Indoor Humidity: 67% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 46%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

8 PM

83° 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 47% Partly sunny

• RealFeel Shade™: 90°
• Wind: SE 7 mph
• Air Quality: Fair
• Max UV Index: 0 (Low)
• Wind Gusts: 15 mph
• Humidity: 77%
• Indoor Humidity: 77% (Extremely Humid)
• Dew Point: 75° F
• AccuLumen Brightness Index™: 1 (Dark)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

9 PM

80° 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. LEARN MORE 51% Partly cloudy w/ t-storms

• Wind: SE 7 mph
• Air Quality: Fair
• Wind Gusts: 14 mph
• Humidity: 84%
• Indoor Humidity: 84% (Extremely Humid)
• Dew Point: 75° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 45%
• Rain: 0.04 in
• Visibility: 7 mi
• Cloud Ceiling: 30000 ft

10 PM

77° 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. LEARN MORE 47% Partly cloudy

• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 14 mph
• Humidity: 89%
• Indoor Humidity: 89% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

11 PM

76° RealFeel® 83° 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 32% Partly cloudy

• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 14 mph
• Humidity: 91%
• Indoor Humidity: 91% (Extremely Humid)
• Dew Point: 74° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft