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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 19 June 2025

Today Tonight and Friday.

Strong wind warning in effect.

Wind light increasing to southwest 10 to 15 knots this morning and to southwest 15 to 25 late this afternoon. Wind veering to northwesterly 15 to 25 overnight then diminishing to southwest 10 to 15 Friday evening.

Showers today and this evening with a risk of thunderstorms. Showers Friday evening with a risk of thunderstorms. Fog banks forming overnight and dissipating Friday morning. Visibility as low as 1 mile in showers and 1 mile or less in fog banks.

Extended Forecast

Issued 06:00 AM EDT 19 June 2025
Saturday Wind light becoming southerly 10 to 15 knots in the afternoon.
Sunday Wind southwest 10 to 15 knots.
Monday Wind southwest 10 to 15 knots.

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Map of Great Lakes - Lake Huron marine weather areas Cove Island Goderich Oshawa Executive Airport CFB Trenton Western Islands Wiarton Airport Point Petre Lake Simcoe Regional Airport Parry Sound Harbour Toronto City Centre Airport Muskoka Airport Lagoon City Brockville Hamilton Munro Int'l Airport Sarnia Chris Hadfield Airport Tobermory Cobourg Harrow AAFC Long Point Port Weller Burlington Lift Bridge St. Catharines / Niagara District Airport Southeast Shoal Point Pelee Vineland Station Welland-Pelham Erieau Windsor Airport Port Colborne Killarney South Georgian Bay - 45143 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Lake St Clair - 45147 South Lake Huron - 45149 Sault Ste. Marie Airport Lake Simcoe - 45151 Collingwood Greater Sudbury Airport North Bay Airport Kingston Airport Peterborough Municipal Airport Grenadier Island Port Colborne - 45142 Great Duck Island Ajax - 45159 Gore Bay-Manitoulin Airport North Channel - 45154 Lake Nipissing - 45152
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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 03:00 AM EDT 19 June 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 09:25 AM EDT 19 June 2025 Conditions are favourable for the development of squalls with wind gusts up to 50 knots.

This afternoon and this evening, conditions will be favourable for the development of squalls with gusts of up to 50 knots.

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 19 June 2025 Today Tonight and Friday At 3:00 a.m. EDT today low 1002 mb located over western Lake Huron.
By 8:00 p.m. EDT Friday low 996 mb located over Chaleur Bay.

At 3:00 a.m. EDT today high 1017 mb located on a line north-south
over western Lake Superior.
By 8:00 p.m. EDT Friday high 1017 mb located on a line north-south
over Lake Erie.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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