Language selection

Government of Canada / Gouvernement du Canada

Search

Weather shortcuts

Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 12 June 2026

Today Tonight and Saturday.

Strong wind warning in effect.

Wind light increasing to southwest 10 to 15 knots early this morning and to southwest 15 to 25 late this afternoon. Wind diminishing to west 10 to 15 near midnight then increasing to west 15 to 25 near noon Saturday. Wind diminishing to west 10 to 15 Saturday evening.

Scattered showers ending early this morning. Showers this afternoon and this evening with a risk of thunderstorms. Fog banks dissipating late this morning. Visibility 1 mile or less in fog banks and as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 12 June 2026
Sunday Wind southwesterly 15 knots increasing to southwest 15 to 25 in the afternoon.
Monday Wind southwest 15 knots.
Tuesday Wind southwest 10 to 15 knots.

Stay connected

ATOM

List of Official Text Forecasts
Resources

Weather Conditions

Skip Image

Zoom-in to make a selection

Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
Legend:
buoy Buoy
land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Strong wind warning in effect

Cornwall to Montréal

Issued 08:08 AM EDT 12 June 2026

'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.

Watches (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 12:03 PM EDT 12 June 2026 This afternoon and evening, conditions are favourable for the development of squalls with wind gusts of up to 50 knots, numerous lightning strikes and poor to very poor visibilities due to rain showers at times heavy.

Proceed with caution as visibility may suddenly be reduced to near-zero. Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

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 12 June 2026 Today Tonight and Saturday At 3:00 a.m. EDT today trough located on a line north-south over
Trois-Rivières.
By 2:00 p.m. EDT today weakening trough located from Lake Saint-Jean
to Québec city.

At 3:00 a.m. EDT today trough located on a line north-south over
Lake Huron.
By 8:00 p.m. EDT Saturday trough located on a line
northwest-southeast over Rimouski.

Great Lakes - Lake Erie and Lake Ontario Area

Another Region

Marine Weather for Canada

Weather shortcuts


How to use
  • Add to shortcuts
    • Go to the desired page on the site, open the Weather shortcuts menu and click on the "Add to shortcuts" button
    • Page name will display in the "Add this page" window, the name can be changed by highlighting the text and entering the desired name
    • Click on the "Save" button to add the link to the list
    • Click on the "X" button to close the panel
  • Delete a link
    • Click on the "Organize shortcuts" button
    • Select the link to delete
    • Click on the "Delete" button to remove the link from the list
    • Click on the "Close" button to save the change
  • Move a link up/down the list
    • Click on the "Organize shortcuts" button
    • Click and hold the link and move to new location in the list
    • Click on the "Close" button to save the change
  • Rename a link
    • Click on the "Organize shortcuts" button
    • Select the link to rename
    • Click on the "Rename" button and change the link name
    • Click the enter or tab key
    • Click on the "Close" button to save the change
  • Keyboard navigation
    • Use the Tab key to move to a button or link
    • Use the Enter key to click on buttons or links
    • Organize shortcuts navigation
      • Use the ↑ Up key to select the link above. If none are selected, it will select the first link.
      • Use the ↓ Down key to select the link below. If none are selected, it will select the last link.
      • Use the Page Up key to move a selection up in the list.
      • Use the Page Down key to move a selection down in the list.
  • Restore default list

    Warning: Clicking on the button below will remove all your customized links.

Customized Weather shortcuts

Save your customized list as a bookmark.

Copy/paste or click on the link below then when the page displays, you can bookmark the page using the web browser. Bookmarking your customized list will allow you to access it even if the local storage on your device is erased.

Features

Colour-coded weather alerts

Learn more about weather alerting in Canada

Thunderstorm Outlooks

Find the Thunderstorm Outlook for your area.

Feedbackabout this web site
Date modified: