# Herndon Weather

## Location
Herndon, 20170, Virginia, United States

·

As of 9:22 pm GMT-4

[Now79°78°77°\
\
Mostly Cloudy Night\
\
Mostly Cloudy\
\
Feels Like\
\
77°\
\
HHigh\
\
83°\
\
LLow\
\
68°\
\
Chance of Rain\
\
7%\
\
0 in](/content/en-FM/us/virginia/herndon/postcode/20170/hourbyhour/index.html)

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

| Time  | Condition           | Temperature |
|-------|---------------------|-------------|
| 00:00 | Cloudy              | 77°         |
| 01:00 | Mostly Cloudy Night | 77°         |
| 02:00 | Mostly Cloudy Night | 76°         |
| 03:00 | Mostly Cloudy Night | 76°         |
| 04:00 | Mostly Cloudy Night | 77°         |
| 05:00 | Mostly Cloudy Night | 76°         |
| 06:00 | Mostly Cloudy Night | 75°         |
| 06:21 | Sunrise             | -           |
| 07:00 | Cloudy              | 74°         |
| 08:00 | Partly Cloudy Day   | 76°         |
| 09:00 | Mostly Cloudy Day   | 77°         |
| 10:00 | Mostly Cloudy Day   | 77°         |
| 11:00 | Cloudy              | 79°         |
| 12:00 | Cloudy              | 78°         |
| 13:00 | Cloudy              | 77°         |
| 14:00 | Mostly Cloudy Day   | 76°         |
| 15:00 | Mostly Cloudy Day   | 78°         |
| 16:00 | Partly Cloudy Day   | 82°         |
| 17:00 | Mostly Cloudy Day   | 82°         |
| 18:00 | Mostly Cloudy Day   | 82°         |
| 19:00 | Mostly Cloudy Day   | 80°         |
| 20:00 | Cloudy              | 78°         |
| 20:05 | Sunset              | -           |
| 21:00 | Cloudy              | 77°         |

### Wind
Wind: 4 mph N  
humidity: 81%  
Air Quality: 63 - Moderate  
Dew Point: 71°  
pressure: 30.05 in  
Uv Index: 0 of 11  
Visibility: 10 mi  
Moon Phase: Waxing Crescent

## Daily Forecast

| Date     | Description         | Chance of Precipitation | Low | High |
|----------|---------------------|-------------------------|-----|------|
| Tonight  | Partly Cloudy Night | 8%                      | 68° | -    |
| Sat 15  | Mostly Clear Day    | 7%                      | 73° | 87°  |
| Sun 16  | Thunderstorms       | 81%                     | 73° | 78°  |
| Mon 17  | Partly Cloudy Day   | 23%                     | 68° | 89°  |
| Tue 18  | Mostly Clear Day    | 5%                      | 65° | 85°  |
| Wed 19  | Mostly Clear Day    | 7%                      | 71° | 88°  |
| Thu 20  | Scattered Thunderstorms | 52%                   | 66° | 87°  |

## Air Quality Index
63  
Moderate  
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

## Health & Activities
- **Grass:** Seasonal Allergies and Pollen Count Forecast  
  Grass pollen is moderate in your area
- **Flu:** Cold & Flu Forecast  
  Flu risk is very low in your area