Hourly Weather Forecast - Alton, IL

12 AM
41°F
0%
5mph
SW
Mostly Cloudy
Humidity
72%
Feels like
38°F
Dew Point
33°F
1 AM
41°F
0%
5mph
SW
Mostly Cloudy
Humidity
75%
Feels like
38°F
Dew Point
34°F
2 AM
41°F
0%
4mph
WSW
Mostly Cloudy
Humidity
78%
Feels like
38°F
Dew Point
34°F
3 AM
40°F
0%
4mph
WSW
Mostly Cloudy
Humidity
81%
Feels like
38°F
Dew Point
35°F
4 AM
39°F
0%
3mph
WSW
Mostly Cloudy
Humidity
84%
Feels like
37°F
Dew Point
35°F
5 AM
38°F
0%
3mph
WSW
Partly Cloudy
Humidity
86%
Feels like
36°F
Dew Point
35°F
6 AM
38°F
0%
3mph
W
Partly Cloudy
Humidity
84%
Feels like
38°F
Dew Point
33°F
7 AM
38°F
0%
2mph
W
Mostly Clear
Humidity
85%
Feels like
38°F
Dew Point
34°F
7:13 AM
8 AM
39°F
0%
2mph
WNW
Mostly Sunny
Humidity
86%
Feels like
39°F
Dew Point
35°F
9 AM
40°F
0%
2mph
NW
Mostly Sunny
Humidity
87%
Feels like
40°F
Dew Point
37°F
10 AM
42°F
0%
1mph
NNW
Mostly Sunny
Humidity
86%
Feels like
42°F
Dew Point
38°F
11 AM
45°F
0%
1mph
NE
Mostly Sunny
Humidity
79%
Feels like
45°F
Dew Point
39°F
12 PM
47°F
0%
1mph
E
Mostly Sunny
Humidity
76%
Feels like
47°F
Dew Point
40°F
1 PM
48°F
0%
1mph
SE
Partly Cloudy
Humidity
72%
Feels like
48°F
Dew Point
40°F
2 PM
49°F
0%
2mph
SE
Mostly Sunny
Humidity
71%
Feels like
49°F
Dew Point
40°F
3 PM
49°F
0%
3mph
SE
Sunny
Humidity
71%
Feels like
48°F
Dew Point
40°F
4 PM
48°F
0%
4mph
SE
Sunny
Humidity
73%
Feels like
46°F
Dew Point
40°F
4:40 PM
5 PM
46°F
0%
5mph
SE
Clear
Humidity
78%
Feels like
44°F
Dew Point
40°F
6 PM
45°F
0%
6mph
SE
Clear
Humidity
83%
Feels like
42°F
Dew Point
40°F
7 PM
44°F
0%
7mph
SSE
Mostly Clear
Humidity
87%
Feels like
40°F
Dew Point
40°F
8 PM
43°F
0%
8mph
SSE
Partly Cloudy
Humidity
89%
Feels like
39°F
Dew Point
40°F
9 PM
43°F
0%
8mph
SSE
Partly Cloudy
Humidity
91%
Feels like
38°F
Dew Point
41°F
10 PM
44°F
0%
9mph
SSE
Partly Cloudy
Humidity
94%
Feels like
39°F
Dew Point
42°F
11 PM
45°F
0%
9mph
SSE
Mostly Cloudy
Humidity
96%
Feels like
40°F
Dew Point
44°F

Rainfall and Snowfall Totals Through Wednesday

Heavy Rain, Snow, and Winds Wallop Northwest

The atmospheric river this week continues to hit the Pacific Northwest with heavy rain, snow, and high winds.

Wednesday's Weather Outlook

Wednesday'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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