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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 10 August 2026

Today Tonight and Tuesday.

Wind light becoming west 15 knots near midnight. Wind west 15 Tuesday.

Periods of rain ending early this morning. Showers tonight. Risk of thunderstorms early this evening. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 10 August 2026
Wednesday Wind light.
Thursday Wind light.
Friday Wind northwest 10 to 15 knots.

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Map of St. Lawrence - St. Lawrence River marine weather areas Grand Manan New Carlisle Pointe-au-Père Fundy Park (Alma) Port Menier Miramichi Île Bicquette Charlo Cap-Chat Bathurst Airport CFB Bagotville Jonquière Mistook Normandin Roberval Airport Île-d'Orléans - Quai de St-Jean Deschambault North Bay Airport Beauport L'Isle-aux-Grues Bas Caraquet Lake Nipissing - 45152 Pointe-des-Monts L'Assomption Baie-Comeau Airport Saint-Anicet Cap-Rouge Sainte-Anne-de-Bellevue Lac Memphrémagog Montréal Metropolitain Airport Île Rouge Montréal-Trudeau Int'l Airport Lac Saint-Pierre Trois-Rivières Airport Pointe de l'Islet Pointe Claveau Sept-Îles Airport Kouchibouguac North Cape Pointe-Noire Yarmouth Airport Cap-d'Espoir Brier Island Rivière-la-Madeleine St. Stephen Gaspé Airport Saint John Airport Point Lepreau Greater Moncton Roméo LeBlanc Int'l Airport La Pocatière Miscou Island Mont-Joli Airport
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buoy Buoy
land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

Watches (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 09:21 AM EDT 10 August 2026 Conditions are favourable for the development of squalls with wind gusts up to 45 knots.

Late this afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 45 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 10 August 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today trough located from Ungava Bay to the Quebec
Lower North Shore.
By 8:00 p.m. EDT tonight departing trough located from Ungava Bay
to the Strait of Belle Isle.

At 2:00 p.m. EDT today disturbance located over western Quebec.
By 8:00 p.m. EDT Tuesday disturbance located over
Îles-de-la-Madeleine.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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