Hourly Weather Forecast - Cornwall, Ontario, CA

12 AM
19°F
30%
5mph
SW
30% Chance of Snow
Humidity
74%
Feels like
12°F
Dew Point
12°F
1 AM
20°F
40%
5mph
SW
40% Chance of Snow
Humidity
74%
Feels like
13°F
Dew Point
13°F
2 AM
19°F
50%
5mph
SW
50% Chance of Snow
Humidity
75%
Feels like
12°F
Dew Point
13°F
3 AM
19°F
50%
5mph
WSW
50% Chance of Snow
Humidity
77%
Feels like
11°F
Dew Point
13°F
4 AM
18°F
60%
6mph
WSW
60% Chance of Snow
Humidity
77%
Feels like
10°F
Dew Point
12°F
5 AM
18°F
60%
5mph
WSW
60% Chance of Snow
Humidity
77%
Feels like
10°F
Dew Point
12°F
6 AM
18°F
60%
5mph
WSW
60% Chance of Snow
Humidity
77%
Feels like
11°F
Dew Point
12°F
7 AM
19°F
60%
5mph
WSW
60% Chance of Snow
Humidity
76%
Feels like
11°F
Dew Point
12°F
7:30 AM
8 AM
19°F
50%
5mph
WSW
50% Chance of Snow
Humidity
74%
Feels like
12°F
Dew Point
13°F
9 AM
21°F
40%
6mph
W
40% Chance of Snow
Humidity
72%
Feels like
13°F
Dew Point
13°F
10 AM
22°F
30%
6mph
W
30% Chance of Snow
Humidity
69%
Feels like
15°F
Dew Point
14°F
11 AM
24°F
30%
6mph
W
30% Chance of Snow
Humidity
67%
Feels like
16°F
Dew Point
14°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

Thursday's Weather Outlook

Thursday'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