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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 06 June 2026

Today Tonight and Sunday.

Strong wind warning in effect.

Wind light increasing to southwest 15 to 20 knots near noon with gusts to 30 near thunderstorms. Wind becoming west 15 to 25 near midnight then becoming northwest 15 Sunday morning. Wind diminishing to light Sunday evening.

Showers today tonight and Sunday morning. Risk of thunderstorms late this afternoon and this evening. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 06 June 2026
Monday Wind light.
Tuesday Wind light.
Wednesday Wind light.

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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
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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 07:52 AM EDT 06 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 or Weatheradio stations.

Watches (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 09:32 AM EDT 06 June 2026 Conditions this afternoon and evening will be favourable for the formation of squalls with gusts between 35 and 45 knots.

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 6 June 2026 Today Tonight and Sunday At 3:00 a.m. EDT today departing ridge located over the Gulf of
St. Lawrence.

At 3:00 a.m. EDT today low 1004 mb located over James Bay.
By 2:00 a.m. EDT Sunday departing low 999 mb located over
Trois-Rivières.

At 8:00 a.m. EDT Sunday ridge located on a line northeast-southwest
over James Bay.
By 8:00 p.m. EDT Sunday approaching ridge located on a line
northeast-southwest over Lake Saint-Jean.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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