# 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-KN/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°        |
| 22:00  | Partly Cloudy Night | 76°        |
| 23:00  | Partly Cloudy Night | 74°        |
| 00:00  | Partly Cloudy Night | 74°        |
| 01:00  | Partly Cloudy Night | 73°        |
| 02:00  | Partly Cloudy Night | 72°        |
| 03:00  | Partly Cloudy Night | 72°        |
| 04:00  | Partly Cloudy Night | 71°        |
| 05:00  | Partly Cloudy Night | 70°        |
| 06:00  | Partly Cloudy Night | 70°        |
| 07:00  | Partly Cloudy Day   | 70°        |

## Wind
Wind: 4 mph NNE

## Humidity
Humidity: 81%

## Air Quality
Air Quality: 63 - Moderate

## Dew Point
Dew Point: 71°

## Pressure
Pressure: 30.04 in

## UV Index
UV Index: 0 of 11

## Visibility
10 mi

## Moon Phase
Waxing Crescent

### Daily Forecast

- [Tonight: Scattered Showers Night 39% Showers Early 69° \ 85°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1786705200/index.html)
- [Sat 15: Partly Cloudy Day 7% Partly Cloudy 73° \ 87°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1786791600/index.html)
- [Sun 16: Thunderstorms 89% T-Storms 74° \ 81°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1786878000/index.html)
- [Mon 17: Partly Cloudy Day 15% Partly Cloudy 68° \ 90°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1786964400/index.html)
- [Tue 18: Mostly Clear Day 5% Mostly Sunny 65° \ 85°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1787050800/index.html)
- [Wed 19: Mostly Clear Day 7% Mostly Sunny 72° \ 88°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1787137200/index.html)
- [Thu 20: Scattered Thunderstorms 50% PM T-Storms 65° \ 87°](/content/en-KN/us/virginia/herndon/postcode/20170/tenday?t=1787223600/index.html)

### 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 Seasonal Allergies and Pollen Count Forecast: Grass pollen is moderate in your area.