# Herndon Weather

## Location
Herndon, 20170, Virginia, United States

As of 9:22 pm GMT-4

**Now** 79° / 78° / 77°  
**Mostly Cloudy Night**  
**Feels Like** 77°  
**High** 83°  
**Low** 68°  
**Chance of Rain** 7%  
**0 in**

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

### Hourly Forecast
| Time | Weather           | 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°         |

### Wind
- **Wind:** 4mph N
- **Humidity:** 81%
- **Air Quality:** 63 - Moderate
- **Dew Point:** 71°
- **Pressure:** 30.05in
- **UV Index:** 0 of 11
- **Visibility:** 10 mi
- **Moon Phase:** Waxing Crescent
- **Sunrise:** 06:21
- **Sunset:** 20:05

# Daily Forecast
| Date   | Weather       | Probability | High | Low |
|--------|---------------|--------------|------|-----|
| Tonight| Partly Cloudy | 8%           | 83°  | 68° |
| Sat 15 | Mostly Clear  | 7%           | 87°  | 73° |
| Sun 16 | Thunderstorms | 81%          | 78°  | 73° |
| Mon 17 | Partly Cloudy | 23%          | 89°  | 68° |
| Tue 18 | Mostly Clear  | 5%           | 85°  | 65° |
| Wed 19 | Mostly Clear  | 7%           | 88°  | 71° |
| Thu 20 | Scattered Thunderstorms | 52% | 87° | 66° |

## Air Quality Index
**Index:** 63  
**Status:** 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.