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December 20th, 2025 :: 12:54 am EST   

Local Weather Report for
St Marys
Ontario, Canada

 St Marys Weather Forecast Summary  
 
Today
Dec 20th
Sunday
Dec 21st
Monday
Dec 22nd
Tuesday
Dec 23rd
Wednesday
Dec 24th
Cloudy Cloudy Cloudy Mix of rain and snow Cloudy
1°C
-5°C
-10°C
-2°C
-9°C
1°C
-2°C
1°C
-5°C
 
 St Marys Detailed Weather Forecast  
 
Saturday, December 20th, 2025
Overnight Temperature: -7°C
A mix of cloudy and clear skies. Windy at times.
Morning Temperature: -2°C
Cloudy with a chance of flurries. Windy.
Afternoon Temperature: 1°C
Cloudy. Wind 30 to 50 km/h.
Evening Temperature: -2°C
Clear with cloudy periods. Wind 30 to 50 km/h.
Sunday, December 21st, 2025
Overnight Temperature: -7°C
Cloudy with a chance of flurries. Windy.
Morning Temperature: -7°C
Cloudy with a chance of flurries. Windy.
Afternoon Temperature: -6°C
Cloudy with a chance of flurries. Windy.
Evening Temperature: -9°C
Mostly clear. Windy at times.
Monday, December 22nd, 2025
Overnight Temperature: -8°C
Cloudy.
Morning Temperature: -6°C
Cloudy. Windy at times.
Afternoon Temperature: -4°C
Cloudy. Windy at times.
Evening Temperature: -3°C
Cloudy. Windy at times.
Tuesday, December 23rd, 2025
Overnight Temperature: -1°C
Cloudy with flurries likely. Windy at times.
Morning Temperature: 0°C
Cloudy with flurries or showers likely. Windy at times.
Afternoon Temperature: 1°C
Cloudy. Windy at times.
Evening Temperature: 0°C
Cloudy. Windy at times.
Wednesday, December 24th, 2025
Overnight Temperature: -3°C
Clear with cloudy periods.
Morning Temperature: -2°C
A mix of cloud and sun.
Afternoon Temperature: -1°C
Cloudy. Windy at times.
Evening Temperature: 0°C
Cloudy. Windy at times.
Thursday, December 25th, 2025
Overnight Temperature: 1°C
Cloudy.
Morning Temperature: 1°C
Cloudy.
Afternoon Temperature: 2°C
Cloudy with a chance of showers. Showers possibly mixed with wet flurries. Windy at times.
Evening Temperature: 9°C
Cloudy with a few showers. Wind 30 to 50 km/h.
Friday, December 26th, 2025
Overnight Temperature: 7°C
Cloudy with a chance of showers. Showers possibly mixed with wet flurries. Wind 30 to 50 km/h.
Morning Temperature: 3°C
Cloudy. Windy.
Afternoon Temperature: 3°C
Cloudy. Windy.
Evening Temperature: 1°C
Clear with cloudy periods.
Saturday, December 27th, 2025
Overnight Temperature: 1°C
A mix of cloudy and clear skies.
Morning Temperature: 3°C
Cloudy.
Afternoon Temperature: 3°C
Cloudy.
Evening Temperature: 1°C
Cloudy.





 

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This WeatherCity Weather Forecast for St Marys, Ontario, Canada is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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