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August 21st, 2025 :: 3:38 pm EDT   

Local Weather Report for
Cornwall
Ontario, Canada

 Cornwall Weather Forecast Summary  
 
Today
Aug 21st
Friday
Aug 22nd
Saturday
Aug 23rd
Sunday
Aug 24th
Monday
Aug 25th
Sunny Cloudy Showers Thundershowers Cloudy
25°C
29°C
13°C
30°C
17°C
27°C
16°C
25°C
15°C
 
 Cornwall Detailed Weather Forecast  
 
Thursday, August 21st, 2025
Afternoon Temperature: 23°C
Sunny. Windy at times.
Evening Temperature: 15°C
Clear.
Friday, August 22nd, 2025
Overnight Temperature: 15°C
Clear.
Morning Temperature: 26°C
Sunny with cloudy periods.
Afternoon Temperature: 24°C
A mix of cloud and sun.
Evening Temperature: 20°C
Cloudy.
Saturday, August 23rd, 2025
Overnight Temperature: 18°C
Cloudy.
Morning Temperature: 27°C
Cloudy. Windy at times.
Afternoon Temperature: 29°C
Cloudy. Slight chance of a thunderstorm. Windy at times.
Evening Temperature: 19°C
Cloudy with showers likely. Windy at times.
Sunday, August 24th, 2025
Overnight Temperature: 20°C
Cloudy with a chance of showers. Windy at times.
Morning Temperature: 27°C
Sunny with cloudy periods. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 24°C
Cloudy with showers likely. Chance of a thunderstorm. Windy at times.
Evening Temperature: 17°C
Cloudy with showers likely.
Monday, August 25th, 2025
Overnight Temperature: 17°C
Clear with cloudy periods.
Morning Temperature: 23°C
Cloudy with a slight chance of showers. Windy at times.
Afternoon Temperature: 21°C
Cloudy. Windy at times.
Evening Temperature: 15°C
Clear with cloudy periods. Windy at times.
Tuesday, August 26th, 2025
Overnight Temperature: 14°C
Cloudy with clear periods. Windy at times.
Morning Temperature: 19°C
Cloudy with a slight chance of showers. Windy at times.
Afternoon Temperature: 17°C
Cloudy.
Evening Temperature: 11°C
A mix of cloudy and clear skies.
Wednesday, August 27th, 2025
Overnight Temperature: 12°C
Cloudy.
Morning Temperature: 15°C
Cloudy. Windy at times.
Afternoon Temperature: 18°C
Cloudy.
Evening Temperature: 13°C
Clear with cloudy periods.
Thursday, August 28th, 2025
Overnight Temperature: 14°C
Clear with cloudy periods.
Morning Temperature: 23°C
A mix of cloud and sun.
Afternoon Temperature: 22°C
Cloudy.
Evening Temperature: 17°C
A mix of clear and cloudy skies.
Friday, August 29th, 2025
Overnight Temperature: 16°C
A mix of cloudy and clear skies.
Morning Temperature: 26°C
Sunny with cloudy periods.
Afternoon Temperature: 26°C
Cloudy. Windy at times.
Evening Temperature: 17°C
A mix of cloudy and clear skies.





 

  [ Local Weather Report ]
Massena, NY 
 
Lancaster, ON 
 
Apple Hill, ON 
2:00 PM  25°C
 
 
Avondale, ON 
 
Monkland, ON 
2:00 PM  25°C
 
 
South Lancaster, ON 
2:00 PM  24°C
 
 
Glen Gordon, ON 
 
Avonmore, ON 
2:00 PM  25°C
 
 
Sainte Agnes, QC 
2:00 PM  24°C
 
 
Beaver Crossing, QC 
2:00 PM  24°C
 

This WeatherCity Weather Forecast for Cornwall, 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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