Hourly Weather Forecast - Alton, IL

12 AM
33°F
0%
3mph
SW
Mostly Clear
Humidity
53%
Feels like
33°F
Dew Point
18°F
1 AM
32°F
0%
3mph
SW
Clear
Humidity
57%
Feels like
32°F
Dew Point
19°F
2 AM
32°F
10%
3mph
SW
Clear
Humidity
61%
Feels like
32°F
Dew Point
20°F
3 AM
31°F
10%
3mph
SSW
Clear
Humidity
64%
Feels like
28°F
Dew Point
20°F
4 AM
30°F
10%
3mph
SSW
Clear
Humidity
67%
Feels like
27°F
Dew Point
20°F
5 AM
29°F
10%
3mph
SSW
Clear
Humidity
69%
Feels like
26°F
Dew Point
21°F
6 AM
29°F
10%
3mph
S
Mostly Clear
Humidity
71%
Feels like
26°F
Dew Point
21°F
7 AM
30°F
10%
4mph
S
Mostly Clear
Humidity
73%
Feels like
27°F
Dew Point
23°F
7:12 AM
8 AM
32°F
10%
4mph
S
Mostly Sunny
Humidity
73%
Feels like
29°F
Dew Point
25°F
9 AM
35°F
10%
4mph
S
Sunny
Humidity
71%
Feels like
32°F
Dew Point
27°F
10 AM
38°F
10%
5mph
SSW
Sunny
Humidity
68%
Feels like
35°F
Dew Point
29°F
11 AM
41°F
10%
6mph
SSW
Sunny
Humidity
66%
Feels like
37°F
Dew Point
31°F
12 PM
45°F
10%
6mph
SSW
Sunny
Humidity
62%
Feels like
41°F
Dew Point
33°F
1 PM
47°F
10%
7mph
SSW
Sunny
Humidity
60%
Feels like
43°F
Dew Point
34°F
2 PM
48°F
10%
7mph
SSW
Sunny
Humidity
61%
Feels like
45°F
Dew Point
35°F
3 PM
47°F
10%
6mph
SSW
Mostly Sunny
Humidity
64%
Feels like
44°F
Dew Point
36°F
4 PM
46°F
10%
6mph
SSW
Mostly Sunny
Humidity
68%
Feels like
42°F
Dew Point
36°F
4:39 PM
5 PM
44°F
10%
6mph
S
Partly Cloudy
Humidity
72%
Feels like
40°F
Dew Point
35°F
6 PM
42°F
10%
6mph
S
Mostly Cloudy
Humidity
76%
Feels like
38°F
Dew Point
35°F
7 PM
40°F
10%
6mph
S
Cloudy
Humidity
79%
Feels like
37°F
Dew Point
34°F
8 PM
40°F
10%
5mph
S
Cloudy
Humidity
81%
Feels like
36°F
Dew Point
34°F
9 PM
39°F
10%
5mph
SSW
Cloudy
Humidity
82%
Feels like
35°F
Dew Point
34°F
10 PM
39°F
10%
5mph
SSW
Cloudy
Humidity
84%
Feels like
35°F
Dew Point
35°F
11 PM
39°F
10%
5mph
SW
Cloudy
Humidity
85%
Feels like
35°F
Dew Point
35°F

Rainfall Totals Through Wednesday A.M.

Heavy Rain Returns to Deluge Pacific Northwest

Another atmospheric river will hit the Pacific Northwest with heavy rain and high winds.

Monday's Weather Outlook

Today's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

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