Hourly Weather Forecast - Petersburg, IL

12 AM
42°F
0%
15mph
S
Mostly Cloudy
Humidity
91%
Feels like
34°F
Dew Point
39°F
1 AM
43°F
10%
16mph
S
Mostly Cloudy
Humidity
92%
Feels like
36°F
Dew Point
41°F
2 AM
45°F
10%
17mph
S
Mostly Cloudy
Humidity
93%
Feels like
37°F
Dew Point
43°F
3 AM
46°F
20%
18mph
S
Cloudy
Humidity
94%
Feels like
39°F
Dew Point
44°F
4 AM
47°F
10%
18mph
S
Cloudy
Humidity
94%
Feels like
40°F
Dew Point
46°F
5 AM
48°F
30%
19mph
S
30% Chance of Light Rain
Humidity
94%
Feels like
41°F
Dew Point
47°F
6 AM
49°F
30%
20mph
S
30% Chance of Light Rain
Humidity
94%
Feels like
42°F
Dew Point
47°F
7 AM
50°F
30%
20mph
S
30% Chance of Light Rain
Humidity
94%
Feels like
50°F
Dew Point
48°F
7:15 AM
8 AM
51°F
50%
21mph
S
50% Chance of Rain
Humidity
94%
Feels like
51°F
Dew Point
49°F
9 AM
51°F
80%
20mph
SSW
80% Chance of Rain
Humidity
94%
Feels like
51°F
Dew Point
49°F
10 AM
50°F
80%
17mph
SSW
80% Chance of Light Rain
Humidity
93%
Feels like
50°F
Dew Point
48°F
11 AM
48°F
80%
15mph
SW
80% Chance of Light Rain
Humidity
92%
Feels like
42°F
Dew Point
46°F
12 PM
47°F
50%
15mph
W
50% Chance of Light Rain
Humidity
89%
Feels like
40°F
Dew Point
44°F
1 PM
46°F
30%
13mph
W
30% Chance Rain Showers
Humidity
84%
Feels like
40°F
Dew Point
41°F
2 PM
45°F
20%
13mph
W
Mostly Cloudy
Humidity
77%
Feels like
39°F
Dew Point
39°F
3 PM
44°F
10%
13mph
WSW
Cloudy
Humidity
72%
Feels like
38°F
Dew Point
36°F
4 PM
42°F
10%
13mph
W
Mostly Cloudy
Humidity
70%
Feels like
36°F
Dew Point
33°F
4:36 PM
5 PM
40°F
10%
15mph
W
Partly Cloudy
Humidity
69%
Feels like
32°F
Dew Point
31°F
6 PM
37°F
10%
18mph
WNW
Mostly Clear
Humidity
68%
Feels like
27°F
Dew Point
28°F
7 PM
34°F
10%
19mph
WNW
Mostly Clear
Humidity
67%
Feels like
23°F
Dew Point
24°F
8 PM
30°F
10%
19mph
WNW
Partly Cloudy
Humidity
65%
Feels like
18°F
Dew Point
20°F
9 PM
27°F
0%
20mph
WNW
Partly Cloudy
Humidity
63%
Feels like
13°F
Dew Point
16°F
10 PM
25°F
0%
20mph
WNW
Partly Cloudy
Humidity
62%
Feels like
10°F
Dew Point
13°F
11 PM
23°F
0%
20mph
WNW
Partly Cloudy
Humidity
61%
Feels like
8°F
Dew Point
12°F

Rainfall and Snowfall Totals Through Thursday

Flooding Rain, Heavy Snow and Winds Slam Northwest, North-Central U.S.

The atmospheric river this week will keep buffeting the Pacific Northwest with heavy rain, snow, and high winds.

Thursday's Weather Outlook

Thursday'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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