Hourly Weather Forecast - Sarnia, Ontario, CA

12 AM
21°F
0%
8mph
WSW
Mostly Cloudy
Humidity
62%
Feels like
11°F
Dew Point
10°F
1 AM
21°F
0%
8mph
WSW
Mostly Cloudy
Humidity
63%
Feels like
12°F
Dew Point
11°F
2 AM
22°F
0%
8mph
SW
Mostly Cloudy
Humidity
66%
Feels like
13°F
Dew Point
12°F
3 AM
23°F
0%
9mph
SSW
Mostly Cloudy
Humidity
69%
Feels like
13°F
Dew Point
14°F
4 AM
24°F
0%
9mph
S
Partly Cloudy
Humidity
71%
Feels like
14°F
Dew Point
15°F
5 AM
24°F
0%
11mph
S
Partly Cloudy
Humidity
70%
Feels like
13°F
Dew Point
16°F
6 AM
24°F
0%
12mph
S
Mostly Cloudy
Humidity
68%
Feels like
13°F
Dew Point
15°F
7 AM
24°F
0%
13mph
S
Mostly Cloudy
Humidity
68%
Feels like
13°F
Dew Point
15°F
7:56 AM
8 AM
25°F
0%
14mph
S
Cloudy
Humidity
69%
Feels like
13°F
Dew Point
16°F
9 AM
26°F
0%
15mph
S
Cloudy
Humidity
69%
Feels like
15°F
Dew Point
18°F
10 AM
28°F
0%
15mph
S
Cloudy
Humidity
67%
Feels like
16°F
Dew Point
19°F
11 AM
30°F
0%
16mph
S
Cloudy
Humidity
65%
Feels like
19°F
Dew Point
20°F
12 PM
32°F
0%
16mph
S
Cloudy
Humidity
58%
Feels like
21°F
Dew Point
19°F
1 PM
33°F
10%
16mph
S
Cloudy
Humidity
55%
Feels like
23°F
Dew Point
19°F
2 PM
35°F
10%
16mph
SSW
Cloudy
Humidity
53%
Feels like
25°F
Dew Point
19°F
3 PM
35°F
10%
15mph
SSW
Cloudy
Humidity
51%
Feels like
26°F
Dew Point
19°F
4 PM
35°F
10%
13mph
SSW
Cloudy
Humidity
53%
Feels like
26°F
Dew Point
20°F
4:57 PM
5 PM
35°F
10%
13mph
SSW
Cloudy
Humidity
54%
Feels like
27°F
Dew Point
20°F
6 PM
35°F
10%
12mph
SSW
Cloudy
Humidity
58%
Feels like
27°F
Dew Point
22°F
7 PM
35°F
30%
11mph
SW
30% Chance of Flurries
Humidity
60%
Feels like
27°F
Dew Point
23°F
8 PM
35°F
30%
11mph
SW
30% Chance Snow Showers
Humidity
65%
Feels like
27°F
Dew Point
24°F
9 PM
34°F
30%
12mph
WSW
30% Chance Snow Showers
Humidity
70%
Feels like
25°F
Dew Point
25°F
10 PM
33°F
20%
12mph
WSW
Mostly Clear
Humidity
73%
Feels like
24°F
Dew Point
25°F
11 PM
31°F
10%
13mph
WSW
Clear
Humidity
73%
Feels like
21°F
Dew Point
23°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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