Herndon, VA

Hourly

12 PM

81° 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 0% Mostly sunny

• RealFeel Shade™: 79°
• Heat Index: 81°
• Wind: SW 7 mph
• Air Quality: Fair
• Max UV Index: 10.0 (Very High)
• Wind Gusts: 10 mph
• Humidity: 44%
• Indoor Humidity: 44% (Slightly Humid)
• Dew Point: 58° F
• AccuLumen Brightness Index™: 9 (Very Bright)
• Cloud Cover: 10%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

1 PM

83° 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 0% Mostly sunny

• RealFeel Shade™: 80°
• Heat Index: 82°
• Wind: SW 7 mph
• Air Quality: Fair
• Max UV Index: 11.0 (Extreme)
• Wind Gusts: 13 mph
• Humidity: 40%
• Indoor Humidity: 40% (Slightly Humid)
• Dew Point: 57° F
• AccuLumen Brightness Index™: 9 (Very Bright)
• Cloud Cover: 10%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

2 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 47% Partly sunny

• RealFeel Shade™: 81°
• Heat Index: 83°
• Wind: SW 8 mph
• Air Quality: Fair
• Max UV Index: 10.0 (Very High)
• Wind Gusts: 14 mph
• Humidity: 38%
• Indoor Humidity: 38% (Slightly Humid)
• Dew Point: 56° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

3 PM

84° 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 51% Partly sunny w/ t-storms

• RealFeel Shade™: 78°
• Heat Index: 83°
• Wind: SW 8 mph
• Air Quality: Fair
• Max UV Index: 7.6 (Very High)
• Wind Gusts: 16 mph
• Humidity: 39%
• Indoor Humidity: 39% (Slightly Humid)
• Dew Point: 57° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Rain: 0.04 in
• Visibility: 6 mi
• Cloud Ceiling: 30000 ft

4 PM

87° 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™: 84°
• Heat Index: 85°
• Wind: SW 8 mph
• Air Quality: Fair
• Max UV Index: 4.9 (Moderate)
• Wind Gusts: 17 mph
• Humidity: 35%
• Indoor Humidity: 35% (Slightly Humid)
• Dew Point: 56° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

5 PM

86° 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. LEARN MORE 19% Partly sunny

• RealFeel Shade™: 83°
• Heat Index: 85°
• Wind: SSW 8 mph
• Air Quality: Fair
• Max UV Index: 3.4 (Moderate)
• Wind Gusts: 20 mph
• Humidity: 35%
• Indoor Humidity: 35% (Slightly Humid)
• Dew Point: 56° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

6 PM

86° 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 19% Partly sunny

• RealFeel Shade™: 83°
• Heat Index: 84°
• Wind: SSW 8 mph
• Air Quality: Fair
• Max UV Index: 2.2 (Low)
• Wind Gusts: 17 mph
• Humidity: 35%
• Indoor Humidity: 35% (Ideal Humidity)
• Dew Point: 55° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

7 PM

84° 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 13% Partly sunny

• RealFeel Shade™: 81°
• Heat Index: 83°
• Wind: S 8 mph
• Air Quality: Fair
• Max UV Index: 1.2 (Low)
• Wind Gusts: 13 mph
• Humidity: 38%
• Indoor Humidity: 38% (Slightly Humid)
• Dew Point: 56° F
• AccuLumen Brightness Index™: 7 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

8 PM

82° RealFeel® 79° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 0% Mostly sunny

• RealFeel Shade™: 79°
• Heat Index: 82°
• Wind: SSE 7 mph
• Air Quality: Fair
• Max UV Index: 0.3 (Low)
• Wind Gusts: 9 mph
• Humidity: 48%
• Indoor Humidity: 48% (Slightly Humid)
• Dew Point: 60° F
• AccuLumen Brightness Index™: 2 (Dark)
• Cloud Cover: 25%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

9 PM

79° RealFeel® 77° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 0% Mostly clear

• Wind: SSE 7 mph
• Air Quality: Fair
• Wind Gusts: 9 mph
• Humidity: 54%
• Indoor Humidity: 54% (Slightly Humid)
• Dew Point: 61° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 25%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

10 PM

76° RealFeel® 74° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 0% Mostly clear

• Wind: SSE 8 mph
• Air Quality: Fair
• Wind Gusts: 9 mph
• Humidity: 61%
• Indoor Humidity: 61% (Slightly Humid)
• Dew Point: 62° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 25%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

11 PM

74° RealFeel® 72° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 0% Mostly clear

• Wind: SSE 8 mph
• Air Quality: Fair
• Wind Gusts: 9 mph
• Humidity: 68%
• Indoor Humidity: 68% (Humid)
• Dew Point: 63° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 25%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft