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Forecast

Marine Forecast

Issued 08:00 PM ADT 17 August 2026

Tonight and Tuesday.

Wind southwesterly 15 to 20 knots diminishing to southerly 10 to 15 near midnight and to light early Tuesday morning. Wind becoming northeast 10 to 15 Tuesday afternoon then diminishing to light Tuesday evening.

Scattered showers ending overnight. Showers and fog patches Tuesday evening with a risk of thunderstorms.

Waves

Issued 05:00 PM ADT 17 August 2026
Tonight and Tuesday. Seas 1 metre.

Extended Forecast

Issued 03:30 PM ADT 17 August 2026
Wednesday Wind light becoming southwest 15 knots late in the day.
Thursday Wind light.
Friday Wind light becoming southwest 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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land station Land Station
Ice Conditions

Ice Forecasts

Issued 10:00 AM EDT 19 May 2026 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 8:00 PM ADT 17 August 2026 Tonight and Tuesday At 8:00 p.m. ADT tonight trough located from Quebec to Long Island.
By 3:00 a.m. ADT Tuesday weakening trough located from Labrador
to New England.

At 3:00 a.m. ADT Tuesday low 1011 mb located south of Cape Cod.
By 8:00 p.m. ADT Tuesday low 1008 mb located near Browns Bank.

At 8:00 p.m. ADT tonight quasi-stationary ridge located over the
southeastern Marine District.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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