Hourly Weather in Chelsea, Massachusetts, United States
∙ View on Radar5 min
1 hour
6 hours
1 day
Wind
3 km/h
Calm
2 km/h
Calm
6 km/h
Calm
10 km/h
Light
13 km/h
Light
14 km/h
Light
16 km/h
Breezy
19 km/h
Breezy
19 km/h
Breezy
Humidity
69%
Humid
59%
Comfortable
53%
Comfortable
36%
Dry
34%
Dry
33%
Dry
41%
Dry
46%
Comfortable
51%
Comfortable
Visibility
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
Pressure
1021 hPa
High
1021 hPa
High
1022 hPa
High
1020 hPa
High
1020 hPa
High
1019 hPa
High
1019 hPa
High
1018 hPa
High
1018 hPa
High
Clouds
0%
0%
3%
0%
0%
0%
0%
0%
0%
Dew point
14°
13°
13°
8°
8°
7°
9°
10°
11°
UV Index
3
5
6
7
7
7
5
3
2
Air quality
31
Good
32
Good
33
Good
33
Good
34
Good
35
Good
35
Good
57
Moderate
55
Moderate
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
8.6 μg/m3
8.6 μg/m3
8.6 μg/m3
8.6 μg/m3
8.6 μg/m3
8.6 μg/m3
8.6 μg/m3
10.1 μg/m3
9.1 μg/m3
PM25
5.6 μg/m3
5.7 μg/m3
5.8 μg/m3
5.9 μg/m3
6.1 μg/m3
6.2 μg/m3
6.3 μg/m3
9.2 μg/m3
8.8 μg/m3
NO2
5.8 ppb
4.2 ppb
2.7 ppb
2.2 ppb
1.6 ppb
1.1 ppb
1.1 ppb
1.3 ppb
1.4 ppb
SO2
0.3 ppb
0.3 ppb
0.3 ppb
0.3 ppb
0.3 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
CO
0.2 ppb
0.2 ppb
0.2 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
O3
24.3 ppb
25.3 ppb
26.6 ppb
28.3 ppb
29.9 ppb
31.5 ppb
32.9 ppb
63.4 ppb
61 ppb