# Herndon Weather

**Location**  
Herndon, 20170, Virginia, United States

·

As of 21:02 GMT-4  
**Now**  
**79°**  
**Cloudy**  
**Feels Like**  
**77°**  
**High**  
**85°**  
**Low**  
**69°**  
**Chance of Rain**  
**8%**  
**0 in**

## Today's outlook

Tonight's low temperature will be nearly the same as last night's.

**Hourly Forecast**  
| Time   | Condition         | Temperature |
|--------|-------------------|-------------|
| 0:00   | Cloudy            | 77°         |
| 1:00   | Mostly Cloudy Night| 77°        |
| 2:00   | Mostly Cloudy Night| 76°        |
| 3:00   | Mostly Cloudy Night| 76°        |
| 4:00   | Mostly Cloudy Night| 77°        |
| 5:00   | Mostly Cloudy Night| 76°        |
| 6:00   | Mostly Cloudy Night| 75°        |
| 7:00   | Cloudy            | 74°         |
| 8:00   | Partly Cloudy Day | 76°         |
| 9:00   | 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°        |
| 0:00   | Partly Cloudy Night| 74°        |
| 1:00   | Partly Cloudy Night| 73°        |
| 2:00   | Partly Cloudy Night| 72°        |
| 3:00   | Partly Cloudy Night| 72°        |
| 4:00   | Partly Cloudy Night| 71°        |
| 5:00   | Partly Cloudy Night| 70°        |
| 6:00   | Partly Cloudy Night| 70°        |
| 7:00   | Partly Cloudy Day | 70°         |

**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**: 6:21  
**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.  
[See details](/content/en-CM/forecast/air-quality/l/38.97,-77.386)

## Health & Activities

**Grass Pollen**: Grass pollen is moderate in your area.  
**Flu Risk**: Flu risk is very low in your area.