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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 09 August 2026

Tonight and Monday.

Wind west 15 to 20 knots diminishing to light near midnight then becoming west 10 to 15 Monday morning. Wind becoming light Monday evening.

Showers Monday afternoon and evening with a risk of thunderstorms. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 09 August 2026
Tuesday Wind west 10 to 20 knots.
Wednesday Wind southwest 10 to 15 knots.
Thursday Wind light.

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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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 9 August 2026 Tonight and Monday At 3:00 p.m. EDT today trough located from James Bay to Rimouski.
By 8:00 p.m. EDT Monday trough located from Ungava Bay to the
Quebec Lower North Shore.

At 3:00 p.m. EDT today ridge located on a line north-south over
Lake Ontario.
By 8:00 p.m. EDT Monday ridge located on a line north-south over
New Brunswick.

At 3:00 p.m. EDT today low 1012 mb located over the Midwestern
states.
By 8:00 p.m. EDT Monday low 1008 mb located near Montréal.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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