Hourly Weather Forecast - St Marys, Ontario, CA

12 AM
20°F
20%
10mph
W
Mostly Cloudy
Humidity
77%
Feels like
9°F
Dew Point
14°F
1 AM
20°F
20%
9mph
W
Cloudy
Humidity
76%
Feels like
9°F
Dew Point
13°F
2 AM
20°F
20%
8mph
WSW
Mostly Cloudy
Humidity
76%
Feels like
10°F
Dew Point
13°F
3 AM
19°F
10%
9mph
SW
Partly Cloudy
Humidity
78%
Feels like
9°F
Dew Point
14°F
4 AM
19°F
10%
10mph
SW
Partly Cloudy
Humidity
81%
Feels like
8°F
Dew Point
14°F
5 AM
19°F
10%
10mph
SSW
Partly Cloudy
Humidity
85%
Feels like
8°F
Dew Point
15°F
6 AM
19°F
0%
11mph
S
Partly Cloudy
Humidity
89%
Feels like
7°F
Dew Point
16°F
7 AM
19°F
0%
12mph
S
Mostly Cloudy
Humidity
84%
Feels like
7°F
Dew Point
15°F
7:52 AM
8 AM
20°F
0%
14mph
S
Mostly Cloudy
Humidity
82%
Feels like
7°F
Dew Point
16°F
9 AM
23°F
0%
15mph
S
Cloudy
Humidity
78%
Feels like
9°F
Dew Point
17°F
10 AM
25°F
10%
17mph
S
Cloudy
Humidity
76%
Feels like
12°F
Dew Point
18°F
11 AM
26°F
10%
17mph
S
Cloudy
Humidity
75%
Feels like
14°F
Dew Point
20°F
12 PM
28°F
20%
18mph
S
Cloudy
Humidity
73%
Feels like
16°F
Dew Point
21°F
1 PM
29°F
20%
18mph
S
Cloudy
Humidity
71%
Feels like
17°F
Dew Point
21°F
2 PM
31°F
20%
18mph
S
Cloudy
Humidity
68%
Feels like
19°F
Dew Point
21°F
3 PM
31°F
30%
18mph
S
30% Chance of Flurries
Humidity
66%
Feels like
20°F
Dew Point
21°F
4 PM
32°F
30%
17mph
SSW
30% Chance of Flurries
Humidity
68%
Feels like
20°F
Dew Point
22°F
4:51 PM
5 PM
32°F
40%
16mph
SSW
40% Chance of Flurries
Humidity
68%
Feels like
21°F
Dew Point
23°F
6 PM
32°F
40%
15mph
SSW
40% Chance of Flurries
Humidity
70%
Feels like
22°F
Dew Point
24°F
7 PM
32°F
60%
15mph
SW
60% Chance of Snow
Humidity
74%
Feels like
22°F
Dew Point
25°F
8 PM
32°F
50%
15mph
SW
50% Chance of Flurries
Humidity
78%
Feels like
21°F
Dew Point
26°F
9 PM
31°F
40%
15mph
WSW
40% Chance of Flurries
Humidity
79%
Feels like
21°F
Dew Point
26°F
10 PM
31°F
30%
16mph
WSW
30% Chance Snow Showers
Humidity
81%
Feels like
20°F
Dew Point
26°F
11 PM
30°F
30%
16mph
WSW
30% Chance of Snow
Humidity
82%
Feels like
19°F
Dew Point
25°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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