Hourly Weather Forecast - Sullivan, IL

7 AM
41°F
70%
19mph
W
70% Chance of Light Rain
Humidity
87%
Feels like
32°F
Dew Point
38°F
7:04 AM
8 AM
40°F
30%
19mph
W
30% Chance of Light Rain
Humidity
86%
Feels like
31°F
Dew Point
36°F
9 AM
39°F
30%
20mph
W
30% Chance of Light Rain
Humidity
84%
Feels like
29°F
Dew Point
35°F
10 AM
38°F
20%
21mph
WNW
Windy
Humidity
84%
Feels like
27°F
Dew Point
33°F
11 AM
36°F
30%
21mph
WNW
30% Chance Frozen Mix
Humidity
85%
Feels like
25°F
Dew Point
32°F
12 PM
35°F
10%
21mph
WNW
Windy
Humidity
85%
Feels like
24°F
Dew Point
31°F
1 PM
34°F
30%
20mph
NW
30% Chance Frozen Mix
Humidity
85%
Feels like
23°F
Dew Point
30°F
2 PM
34°F
10%
19mph
NW
Cloudy
Humidity
85%
Feels like
22°F
Dew Point
29°F
3 PM
33°F
10%
18mph
NW
Cloudy
Humidity
84%
Feels like
22°F
Dew Point
29°F
4 PM
32°F
0%
17mph
NW
Cloudy
Humidity
83%
Feels like
21°F
Dew Point
28°F
4:30 PM
5 PM
31°F
0%
14mph
NW
Cloudy
Humidity
83%
Feels like
20°F
Dew Point
26°F
6 PM
30°F
0%
13mph
NW
Cloudy
Humidity
83%
Feels like
20°F
Dew Point
25°F
7 PM
29°F
0%
12mph
NW
Mostly Cloudy
Humidity
83%
Feels like
19°F
Dew Point
24°F
8 PM
28°F
0%
11mph
NW
Cloudy
Humidity
83%
Feels like
19°F
Dew Point
24°F
9 PM
28°F
0%
11mph
NW
Cloudy
Humidity
85%
Feels like
18°F
Dew Point
24°F
10 PM
27°F
0%
10mph
NW
Cloudy
Humidity
87%
Feels like
17°F
Dew Point
24°F
11 PM
27°F
30%
9mph
NW
30% Chance of Snow
Humidity
89%
Feels like
17°F
Dew Point
24°F

Snow and ice forecast through Friday A.M.

Multiple Snow Threats Across the Northern U.S.

Multiple systems will bring snow across the Northern U.S. through the end of the week.

Rainfall Forecast for Northwest through Friday A.M.

Unrelenting Rains Soak the Northwest

Today's Weather Outlook

Today's Weather Outlook

Weekly Drought Map for December 4, 2025

Active Week of Weather Leads to Mixed Drought Results

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

Cold Air Damming - Cause And Effects

People skating on a frozen pond on a clear day. (Image by Q K from Pixabay)

Safety Tips For Icy Surfaces

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

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Outdoor Sports Guide