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Cornwall to Montréal

Forecast

Marine Forecast

Issued 03:00 PM EDT 16 July 2025

Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 10 to 15 knots becoming light this evening then increasing to southwest 15 near noon Thursday. Wind increasing to southwest 20 to 30 Thursday afternoon.

Showers overnight and Thursday with a risk of thunderstorms. Visibility 1 mile or less in showers.

Extended Forecast

Issued 06:00 PM EDT 16 July 2025
Friday Wind northwest 15 knots backing to southwest 10 to 15 in the afternoon.
Saturday Wind light becoming southwest 10 to 15 knots.
Sunday Wind light becoming northwest 10 to 15 knots.

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

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Strong wind warning in effect

Cornwall to Montréal

Issued 10:06 PM EDT 16 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.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 16 July 2025 Tonight and Thursday At 3:00 p.m. EDT today ridge located on a line northwest-southeast
over Havre Saint-Pierre.
By 8:00 p.m. EDT tonight weakening ridge located on a line
northwest-southeast over the Quebec Lower North Shore.

At 3:00 p.m. EDT today warm front from low located on a line
east-west over Lake Superior.
By 8:00 p.m. EDT Thursday low 998 mb located north of Québec city.

Great Lakes - Lake Erie and Lake Ontario Area

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