# 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-SL/us/virginia/herndon/postcode/20170/hourbyhour/index.html)

## Today's outlook

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

### Hourly Forecast

| 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°         |
| 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°         |
| 21:00    | Cloudy              | 77°         |
| 22:00    | Partly Cloudy Night | 76°         |
| 23:00    | Partly Cloudy Night | 75°         |

### Wind

Wind: 4 mph N

### Humidity

Humidity: 81%

### Air Quality

- Air Quality Index: 63 - Moderate
- Dew Point: 71°
- Pressure: 30.05 in
- UV Index: 0 of 11
- Visibility: 10 mi
- Moon Phase: Waxing Crescent
- Sunrise: 06:21
- Sunset: 20:05

# Daily Forecast

| Date       | Condition            | Chance of Rain | 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

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 Pollen: Moderate in your area
- Flu Risk: Very low in your area.