Hourly Weather Forecast - Petersburg, IL

12 AM
38°F
10%
8mph
S
Partly Cloudy
Humidity
87%
Feels like
33°F
Dew Point
35°F
1 AM
38°F
10%
8mph
S
Mostly Clear
Humidity
88%
Feels like
33°F
Dew Point
35°F
2 AM
39°F
10%
8mph
S
Clear
Humidity
89%
Feels like
33°F
Dew Point
36°F
3 AM
39°F
10%
8mph
S
Clear
Humidity
90%
Feels like
34°F
Dew Point
36°F
4 AM
39°F
10%
8mph
S
Hazy
Humidity
91%
Feels like
34°F
Dew Point
37°F
5 AM
39°F
10%
8mph
SSW
Partly Cloudy
Humidity
93%
Feels like
33°F
Dew Point
37°F
6 AM
39°F
10%
8mph
SSW
Mostly Cloudy
Humidity
93%
Feels like
34°F
Dew Point
38°F
7 AM
40°F
10%
8mph
SSW
Cloudy
Humidity
93%
Feels like
35°F
Dew Point
39°F
7:18 AM
8 AM
42°F
10%
8mph
SSW
Cloudy
Humidity
92%
Feels like
37°F
Dew Point
40°F
9 AM
44°F
10%
8mph
SSW
Mostly Cloudy
Humidity
90%
Feels like
40°F
Dew Point
41°F
10 AM
46°F
10%
8mph
SSW
Cloudy
Humidity
87%
Feels like
42°F
Dew Point
43°F
11 AM
49°F
10%
9mph
SW
Mostly Cloudy
Humidity
83%
Feels like
45°F
Dew Point
44°F
12 PM
51°F
10%
9mph
SW
Mostly Cloudy
Humidity
80%
Feels like
51°F
Dew Point
45°F

Rainfall and Snowfall Totals Through Thursday

Pineapple Express Slams Northwestern U.S.

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

Wednesday'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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