Hourly Weather in Ashburn, Virginia, United States
∙ View on Radar5 min
1 hour
6 hours
1 day
Wind
6 mph
Light
5 mph
Calm
6 mph
Light
6 mph
Light
7 mph
Light
8 mph
Light
8 mph
Light
8 mph
Light
8 mph
Light
Humidity
75%
Extremely humid
69%
Humid
60%
Comfortable
50%
Comfortable
38%
Dry
32%
Dry
32%
Dry
32%
Dry
32%
Dry
Visibility
10 mi
Good
10 mi
Good
10 mi
Good
10 mi
Good
10 mi
Good
10 mi
Good
10 mi
Good
10 mi
Good
10 mi
Good
Pressure
1021 hPa
High
1021 hPa
High
1021 hPa
High
1020 hPa
High
1019 hPa
High
1019 hPa
High
1018 hPa
Normal
1017 hPa
Normal
1016 hPa
Normal
Clouds
100%
100%
100%
100%
100%
100%
100%
100%
100%
Dew point
46°
47°
47°
45°
42°
39°
40°
40°
40°
UV Index
0
0
2
3
4
5
4
3
2
Air quality
42
Good
42
Good
44
Good
44
Good
44
Good
43
Good
42
Good
40
Good
39
Good
Pollen index
Tree
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Weed
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
2 / 5
3 / 5
3 / 5
4 / 5
Grass
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
Pollutants
Low risk
High risk
PM10
0.46 μg/ft3
0.48 μg/ft3
0.51 μg/ft3
0.47 μg/ft3
0.44 μg/ft3
0.41 μg/ft3
0.39 μg/ft3
0.37 μg/ft3
0.37 μg/ft3
PM25
0.28 μg/ft3
0.30 μg/ft3
0.33 μg/ft3
0.30 μg/ft3
0.28 μg/ft3
0.27 μg/ft3
0.26 μg/ft3
0.25 μg/ft3
0.25 μg/ft3
NO2
3.22 ppb
2.77 ppb
2.32 ppb
1.88 ppb
1.5 ppb
1.12 ppb
0.75 ppb
0.82 ppb
0.89 ppb
SO2
1.69 ppb
1.74 ppb
1.79 ppb
1.84 ppb
1.49 ppb
1.15 ppb
0.81 ppb
0.73 ppb
0.65 ppb
CO
0.2 ppb
0.19 ppb
0.19 ppb
0.19 ppb
0.18 ppb
0.18 ppb
0.17 ppb
0.17 ppb
0.16 ppb
O3
24.58 ppb
26.45 ppb
28.32 ppb
30.19 ppb
34.11 ppb
38.04 ppb
41.96 ppb
41.08 ppb
40.2 ppb