Hourly Weather in Alton, Illinois, United States
∙ View on Radar5 min
1 hour
6 hours
1 day
Wind
9 km/h
Light
12 km/h
Light
8 km/h
Calm
11 km/h
Light
10 km/h
Light
12 km/h
Light
13 km/h
Light
13 km/h
Light
9 km/h
Light
Humidity
74%
Extremely humid
73%
Extremely humid
67%
Humid
66%
Humid
67%
Humid
68%
Humid
66%
Humid
67%
Humid
72%
Extremely humid
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
1006 hPa
Low
1006 hPa
Low
1007 hPa
Low
1007 hPa
Low
1007 hPa
Low
1006 hPa
Low
1005 hPa
Low
1006 hPa
Low
1006 hPa
Low
Clouds
0%
0%
0%
0%
0%
7%
79%
100%
100%
Dew point
25°
25°
24°
23°
23°
23°
22°
22°
23°
UV Index
0
0
0
0
0
0
0
0
0
Air quality
68
Moderate
67
Moderate
65
Moderate
64
Moderate
63
Moderate
45
Good
40
Good
36
Good
33
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
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
1 / 5
Pollutants
Low risk
High risk
PM10
39.9 μg/m3
39.9 μg/m3
39.9 μg/m3
39.9 μg/m3
39.9 μg/m3
8.9 μg/m3
7.9 μg/m3
7.1 μg/m3
6.5 μg/m3
PM25
18 μg/m3
17.3 μg/m3
16.7 μg/m3
16.1 μg/m3
15.5 μg/m3
8 μg/m3
7.1 μg/m3
6.5 μg/m3
5.9 μg/m3
NO2
6.4 ppb
7.4 ppb
6.3 ppb
5.2 ppb
4.1 ppb
4.8 ppb
4.5 ppb
4.1 ppb
4.2 ppb
SO2
0.7 ppb
0.7 ppb
0.6 ppb
0.6 ppb
0.5 ppb
0.6 ppb
0.6 ppb
0.6 ppb
0.6 ppb
CO
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
0.2 ppb
O3
40.7 ppb
41.2 ppb
41.7 ppb
42.1 ppb
42.5 ppb
29.2 ppb
29.2 ppb
29.3 ppb
28.7 ppb