Cornwall to Montréal
Forecast
Marine Forecast
Issued 05:47 AM EDT 17 July 2025
Today Tonight and Friday.
Strong wind warning in effect.
Wind light increasing to southwest 20 to 30 knots near noon with gusts to 50 near thunderstorms. Wind becoming northwest 15 to 25 early this evening then becoming westerly 15 Friday morning.
Showers ending this evening with a risk of thunderstorms. Visibility 1 mile or less in showers.
Extended Forecast
Issued 06:00 AM EDT 17 July 2025
Saturday
Wind southwest 10 to 15 knots increasing to
southwest 15 to 20 in the morning.
Sunday
Wind southwest 10 to 15 knots veering to
northwest 10 to 15.
Monday
Wind northwest 10 to 15 knots.
Stay connected
Weather Conditions
Zoom-in to make a selection

Legend:


Ice Conditions
There is no ice forecast issued for this area.
Warnings
Warnings (In effect)
Strong wind warning in effect
Cornwall to Montréal
Issued 12:17 PM EDT 17 July 2025'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.
Watches (In effect)
Squall watch in effect
Cornwall to Montréal
Issued 11:07 AM EDT 17 July 2025 This afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 50 knots and frequent lightning.Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Synopsis
Technical Marine Synopsis
Issued 3:00 AM EDT 17 July 2025 Today Tonight and Friday At 3:00 a.m. EDT today low 1004 mb located over Lake Huron.By 8:00 p.m. EDT Friday low 988 mb located over Labrador.
At 3:00 a.m. EDT today high located south of Manitoba.
By 8:00 p.m. EDT Friday high located over Lake Ontario.
Great Lakes - Lake Erie and Lake Ontario Area
Another Region
- Date modified: