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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 07 November 2025

Today Tonight and Saturday.

Wind light increasing to southeasterly 15 knots this morning and to southwest 20 to 30 near midnight. Wind diminishing to northwesterly 15 Saturday afternoon.

Rain this afternoon tonight and Saturday morning. Visibility as low as 1 mile in rain.

Temperatures minus 2 rising to plus 9 Saturday morning then falling to plus 4 Saturday evening.

Extended Forecast

Issued 06:00 AM EST 07 November 2025
Sunday Wind light becoming northeast 15 knots in the morning.
Monday Wind northeast 15 knots becoming southwest 10 to 15.
Tuesday Wind west 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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buoy Buoy
land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 7 November 2025 Today Tonight and Saturday At 3:00 a.m. EST today ridge located on a line north-south over
Montréal.
By 7:00 p.m. EST Saturday ridge located on a line
northwest-southeast over the Strait of Belle Isle.

At 3:00 a.m. EST today low 996 mb located near Lake Superior.
By 7:00 p.m. EST Saturday low 1001 mb located near Natashquan.

At 3:00 a.m. EST today ridge located on a line east-west over
northern Ontario.
By 7:00 p.m. EST Saturday ridge located from Lake Superior to
Saguenay River.

Great Lakes - Lake Erie and Lake Ontario Area

Another Region

Marine Weather for Canada

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