Hourly Weather in Merrimac, Massachusetts, United States
∙ View on Radar5 min
1 hour
6 hours
1 day
Wind
10 km/h
Light
7 km/h
Calm
7 km/h
Calm
6 km/h
Calm
6 km/h
Calm
5 km/h
Calm
5 km/h
Calm
6 km/h
Calm
5 km/h
Calm
Humidity
42%
Dry
52%
Comfortable
48%
Comfortable
56%
Comfortable
67%
Humid
85%
Extremely humid
93%
Extremely humid
90%
Extremely humid
90%
Extremely humid
Visibility
16 km
Good
16 km
Good
16 km
Good
16 km
Good
16 km
Good
15 km
Good
8 km
Fair
14 km
Good
13 km
Good
Pressure
1017 hPa
Normal
1017 hPa
Normal
1018 hPa
Normal
1018 hPa
Normal
1017 hPa
Normal
1017 hPa
Normal
1017 hPa
Normal
1016 hPa
Normal
1016 hPa
Normal
Clouds
0%
0%
0%
0%
0%
4%
58%
4%
2%
Dew point
9°
11°
8°
9°
11°
13°
14°
13°
12°
UV Index
0
0
0
0
0
0
0
0
0
Air quality
42
Good
42
Good
42
Good
43
Good
43
Good
43
Good
47
Good
52
Moderate
53
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
12.9 μg/m3
12.9 μg/m3
12.9 μg/m3
12.9 μg/m3
12.9 μg/m3
12.9 μg/m3
12.9 μg/m3
12.1 μg/m3
12.7 μg/m3
PM25
4.3 μg/m3
4.8 μg/m3
5.4 μg/m3
6.2 μg/m3
6.9 μg/m3
7.6 μg/m3
8.3 μg/m3
9.6 μg/m3
10.1 μg/m3
NO2
1.5 ppb
1.9 ppb
2.5 ppb
3.2 ppb
3.8 ppb
4.5 ppb
5.2 ppb
9 ppb
8.9 ppb
SO2
0.1 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.3 ppb
0.3 ppb
0.3 ppb
0.4 ppb
0.3 ppb
CO
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.1 ppb
0.2 ppb
0.2 ppb
0.2 ppb
O3
45.4 ppb
45.5 ppb
45.6 ppb
45.8 ppb
46 ppb
46.2 ppb
46.4 ppb
25.3 ppb
23.5 ppb