Hourly Weather in Castro Valley, California, United States
∙ View on Radar5 min
1 hour
6 hours
1 day
Wind
17 km/h
Breezy
16 km/h
Light
14 km/h
Light
12 km/h
Light
10 km/h
Light
10 km/h
Light
10 km/h
Light
10 km/h
Light
9 km/h
Light
Humidity
67%
Humid
66%
Humid
69%
Humid
76%
Extremely humid
82%
Extremely humid
86%
Extremely humid
87%
Extremely humid
88%
Extremely humid
88%
Extremely humid
Visibility
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
15 km
Good
15 km
Good
14 km
Good
14 km
Good
Pressure
1015 hPa
Normal
1015 hPa
Normal
1015 hPa
Normal
1015 hPa
Normal
1016 hPa
Normal
1016 hPa
Normal
1016 hPa
Normal
1016 hPa
Normal
1016 hPa
Normal
Clouds
10%
9%
8%
9%
14%
40%
64%
51%
40%
Dew point
13°
12°
12°
12°
13°
13°
13°
13°
13°
UV Index
3
1
0
0
0
0
0
0
0
Air quality
20
Good
24
Good
30
Good
35
Good
40
Good
43
Good
43
Good
43
Good
43
Good
Pollen index
Tree
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Weed
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Grass
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
0 / 5
Pollutants
Low risk
High risk
PM10
11.9 μg/m3
11.9 μg/m3
11.9 μg/m3
11.9 μg/m3
11.9 μg/m3
10.6 μg/m3
10.3 μg/m3
10.1 μg/m3
10.1 μg/m3
PM25
3.1 μg/m3
4.2 μg/m3
5.3 μg/m3
6.3 μg/m3
7.2 μg/m3
7.7 μg/m3
7.6 μg/m3
7.6 μg/m3
7.6 μg/m3
NO2
1.3 ppb
2.1 ppb
2.8 ppb
3.6 ppb
4.6 ppb
6.4 ppb
7.7 ppb
8 ppb
8.3 ppb
SO2
0.5 ppb
0.5 ppb
0.5 ppb
0.5 ppb
0.5 ppb
0.5 ppb
0.5 ppb
0.5 ppb
0.5 ppb
CO
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
O3
21.6 ppb
22.8 ppb
24.1 ppb
25.3 ppb
26.4 ppb
20.7 ppb
17.8 ppb
16 ppb
14.7 ppb