# Herndon Weather

## Location
Herndon, 20170, Virginia, United States

As of 9:02 pm GMT-4

[Now79°78°77°\Cloudy\Cloudy\Feels Like\77°\HHigh\85°\LLow\69°\Chance of Rain\8%\0 in](/content/en-LS/us/virginia/herndon/postcode/20170/hourbyhour/index.html)

## Today's outlook
Tonight's low temperature will be nearly the same as 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°         |
| 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°         |

Wind: 4 mph NNE  
Humidity: 81%  
Air Quality: 61 - Moderate  
Dew Point: 71°  
Pressure: 30.04 in  
UV Index: 0 of 11  
Visibility: 10 mi  
Moon Phase: Waxing Crescent  
Sunrise: 06:21  
Sunset: 20:05

# Daily Forecast

| Date | Condition                  | Rain Chance | Low | High |
|------|--------------------------|-------------|-----|------|
| Tonight  | Scattered Showers Night | 39%         | 69° | 85°  |
| Sat 15 | Partly Cloudy Day       | 7%          | 73° | 87°  |
| Sun 16 | Thunderstorms           | 89%         | 74° | 81°  |
| Mon 17 | Partly Cloudy Day       | 15%         | 68° | 90°  |
| Tue 18 | Mostly Clear Day        | 5%          | 65° | 85°  |
| Wed 19 | Mostly Clear Day        | 7%          | 72° | 88°  |
| Thu 20 | Scattered Thunderstorms  | 50%         | 65° | 87°  |

## Air Quality Index
61

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.