Herndon, VA

Hourly

2 PM

86° 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 1% Partly sunny

• RealFeel Shade™: 86°
• Heat Index: 88°
• Wind: ENE 6 mph
• Air Quality: Poor
• Max UV Index: 7.9 (Very High)
• Wind Gusts: 7 mph
• Humidity: 52%
• Indoor Humidity: 52% (Humid)
• Dew Point: 66° F
• AccuLumen Brightness Index™: 9 (Very Bright)
• Cloud Cover: 34%
• Visibility: 10 mi
• Cloud Ceiling: 33400 ft

3 PM

87° 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 1% Partly sunny

• RealFeel Shade™: 88°
• Heat Index: 90°
• Wind: ENE 6 mph
• Air Quality: Poor
• Max UV Index: 5.9 (High)
• Wind Gusts: 7 mph
• Humidity: 51%
• Indoor Humidity: 51% (Very Humid)
• Dew Point: 67° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 29900 ft

4 PM

86° RealFeel® 94° 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 1% Partly sunny

• RealFeel Shade™: 88°
• Heat Index: 90°
• Wind: E 6 mph
• Air Quality: Poor
• Max UV Index: 4.2 (Moderate)
• Wind Gusts: 7 mph
• Humidity: 58%
• Indoor Humidity: 58% (Very Humid)
• Dew Point: 69° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 29900 ft

5 PM

84° 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 1% Partly sunny

• RealFeel Shade™: 87°
• Heat Index: 88°
• Wind: ESE 6 mph
• Air Quality: Poor
• Max UV Index: 2.7 (Moderate)
• Wind Gusts: 8 mph
• Humidity: 60%
• Indoor Humidity: 60% (Very Humid)
• Dew Point: 69° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 29900 ft

6 PM

84° RealFeel® 89° 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 1% Partly sunny

• RealFeel Shade™: 86°
• Heat Index: 88°
• Wind: ESE 6 mph
• Air Quality: Poor
• Max UV Index: 1.7 (Low)
• Wind Gusts: 7 mph
• Humidity: 62%
• Indoor Humidity: 62% (Very Humid)
• Dew Point: 69° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 29900 ft

7 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 1% Partly sunny

• RealFeel Shade™: 86°
• Heat Index: 86°
• Wind: SE 6 mph
• Air Quality: Fair
• Max UV Index: 0.7 (Low)
• Wind Gusts: 7 mph
• Humidity: 66%
• Indoor Humidity: 66% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 4 (Dull)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 29900 ft

8 PM

80° 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 1% Cloudy

• RealFeel Shade™: 83°
• Heat Index: 83°
• Wind: SE 6 mph
• Air Quality: Fair
• Max UV Index: 0.0 (Low)
• Wind Gusts: 6 mph
• Humidity: 69%
• Indoor Humidity: 69% (Very Humid)
• Dew Point: 69° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 90%
• Visibility: 10 mi
• Cloud Ceiling: 14700 ft

9 PM

78° RealFeel® 81° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 1% Mostly cloudy

• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 6 mph
• Humidity: 75%
• Indoor Humidity: 75% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 79%
• Visibility: 10 mi
• Cloud Ceiling: 14700 ft

10 PM

76° RealFeel® 79° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 1% Intermittent clouds

• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 6 mph
• Humidity: 81%
• Indoor Humidity: 81% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 69%
• Visibility: 10 mi
• Cloud Ceiling: 14700 ft

11 PM

75° RealFeel® 78° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 1% Intermittent clouds

• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 7 mph
• Humidity: 84%
• Indoor Humidity: 84% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 65%
• Visibility: 10 mi
• Cloud Ceiling: 14700 ft