Herndon, VA

Hourly

4 PM

89° 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 20% Partly sunny

• RealFeel Shade™: 86°
• Heat Index: 89°
• Wind: WSW 10 mph
• Air Quality: Poor
• Max UV Index: 4.9 (Moderate)
• Wind Gusts: 21 mph
• Humidity: 39%
• Indoor Humidity: 39% (Slightly Humid)
• Dew Point: 61° F
• AccuLumen Brightness Index™: 9 (Very Bright)
• Cloud Cover: 31%
• Visibility: 10 mi
• Cloud Ceiling: 34000 ft

5 PM

90° 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 20% Partly sunny

• RealFeel Shade™: 87°
• Heat Index: 90°
• Wind: WSW 10 mph
• Air Quality: Fair
• Max UV Index: 3.4 (Moderate)
• Wind Gusts: 23 mph
• Humidity: 38%
• Indoor Humidity: 38% (Slightly Humid)
• Dew Point: 61° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

6 PM

89° 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 20% Partly sunny

• RealFeel Shade™: 86°
• Heat Index: 88°
• Wind: WSW 9 mph
• Air Quality: Fair
• Max UV Index: 2.1 (Low)
• Wind Gusts: 16 mph
• Humidity: 38%
• Indoor Humidity: 38% (Slightly Humid)
• Dew Point: 60° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

7 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 25% Partly sunny

• RealFeel Shade™: 84°
• Heat Index: 86°
• Wind: WSW 8 mph
• Air Quality: Fair
• Max UV Index: 1.2 (Low)
• Wind Gusts: 14 mph
• Humidity: 43%
• Indoor Humidity: 43% (Slightly Humid)
• Dew Point: 62° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 45%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

8 PM

84° RealFeel® 81° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 51% Mostly cloudy w/ t-storms

• RealFeel Shade™: 81°
• Heat Index: 86°
• Wind: W 6 mph
• Air Quality: Fair
• Max UV Index: 0.1 (Low)
• Wind Gusts: 9 mph
• Humidity: 55%
• Indoor Humidity: 55% (Humid)
• Dew Point: 66° F
• AccuLumen Brightness Index™: 1 (Dark)
• Cloud Cover: 70%
• Rain: 0.08 in
• Visibility: 5 mi
• Cloud Ceiling: 4000 ft

9 PM

81° RealFeel® 81° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 47% Intermittent clouds

• Heat Index: 83°
• Wind: WNW 6 mph
• Air Quality: Fair
• Wind Gusts: 9 mph
• Humidity: 61%
• Indoor Humidity: 61% (Very Humid)
• Dew Point: 67° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 70%
• Visibility: 10 mi
• Cloud Ceiling: 4000 ft

10 PM

78° RealFeel® 78° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 34% Intermittent clouds

• Wind: NNW 6 mph
• Air Quality: Fair
• Wind Gusts: 8 mph
• Humidity: 67%
• Indoor Humidity: 67% (Humid)
• Dew Point: 66° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 70%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

11 PM

75° RealFeel® 74° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 15% Intermittent clouds

• Wind: NNW 6 mph
• Air Quality: Fair
• Wind Gusts: 8 mph
• Humidity: 71%
• Indoor Humidity: 71% (Humid)
• Dew Point: 65° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 70%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft