# Herndon Weather

## Location
Herndon, 20170, Virginia, United States

As of 21:22 GMT-4

[Now 79° 78° 77°  
Mostly Cloudy Night  
Feels Like  
77°  
High  
83°  
Low  
68°  
Chance of Rain  
7%  
0 in](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour/index.html)

## Today's outlook
Tonight's low temperature will be a little cooler than last night's.

Cloudy
77°

Mostly Cloudy Night
77°

Mostly Cloudy Night
76°

Mostly Cloudy Night
76°

Mostly Cloudy Night
77°

Mostly Cloudy Night
76°

Mostly Cloudy Night
75°

Sunrise

Cloudy
74°

Partly Cloudy Day
76°

Mostly Cloudy Day
77°

Mostly Cloudy Day
77°

Cloudy
79°

Cloudy
78°

Cloudy
77°

Mostly Cloudy Day
76°

Mostly Cloudy Day
78°

Partly Cloudy Day
82°

Mostly Cloudy Day
82°

Mostly Cloudy Day
82°

Mostly Cloudy Day
80°

Cloudy
78°

Sunset

Cloudy
77°
[Now  
Mostly Cloudy Night  
77°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786756920/index.html)

[22:00  
Partly Cloudy Night  
76°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786759200/index.html)

[23:00  
Partly Cloudy Night  
75°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786762800/index.html)

[0:00  
Partly Cloudy Night  
74°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786766400/index.html)

[1:00  
Partly Cloudy Night  
72°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786770000/index.html)

[2:00  
Partly Cloudy Night  
72°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786773600/index.html)

[3:00  
Partly Cloudy Night  
71°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786777200/index.html)

[4:00  
Partly Cloudy Night  
70°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786780800/index.html)

[5:00  
Mostly Clear Night  
70°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786784400/index.html)

[6:00  
Partly Cloudy Night  
69°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786788000/index.html)

[7:00  
Partly Cloudy Day  
69°](/content/en-GB/us/virginia/herndon/postcode/20170/hourbyhour?t=1786791600/index.html)

### Wind
Wind: 4 mph N

### Humidity
Humidity: 81%

### Air Quality
Air Quality: 3 - Low

### Dew Point
Dew Point: 71°

### Pressure
Pressure: 30.05 in

### UV Index
UV Index: 0 of 11

### Visibility
Visibility: 10 mi

### Moon Phase
Waxing Crescent

### Sunrise
Sunrise: 6:21

### Sunset
Sunset: 20:05

# Daily Forecast

- [Tonight  
Partly Cloudy Night8%  
Partly Cloudy  
68°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1786705200/index.html)
- [Sat 15  
Mostly Clear Day7%  
Mostly Sunny  
73°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1786791600/index.html)
- [Sun 16  
Thunderstorms81%  
T-Storms  
73°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1786878000/index.html)
- [Mon 17  
Partly Cloudy Day23%  
Partly Cloudy  
68°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1786964400/index.html)
- [Tue 18  
Mostly Clear Day5%  
Mostly Sunny  
65°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1787050800/index.html)
- [Wed 19  
Mostly Clear Day7%  
Mostly Sunny  
71°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1787137200/index.html)
- [Thu 20  
Scattered Thunderstorms52%  
PM T-Storms  
66°](/content/en-GB/us/virginia/herndon/postcode/20170/tenday?t=1787223600/index.html)

## Air Quality Index
3 - Low
Enjoy your usual outdoor activities.

[See details](/content/en-GB/forecast/air-quality/l/38.97,-77.386)

### Health & Activities
- [Grass  
Seasonal Allergies and Pollen Count Forecast  
Grass pollen is moderate in your area](/content/en-GB/forecast/allergy/l/5c8860db8e32112f6e30d296f4b629e2b5f377a5fb3ac887649b02aec9b79084/index.html)
- [Flu  
Cold & Flu Forecast  
Flu risk is very low in your area](/content/en-GB/forecast/cold-flu/l/5c8860db8e32112f6e30d296f4b629e2b5f377a5fb3ac887649b02aec9b79084/index.html)