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Forecast

Marine Forecast

Issued 03:00 AM ADT 12 August 2026

Today Tonight and Thursday.

Wind northwest 10 to 15 knots diminishing to light late this morning then becoming southwest 15 this afternoon. Wind diminishing to light Thursday afternoon.

Scattered showers Thursday evening.

Waves

Issued 05:00 PM ADT 11 August 2026
Tonight and Wednesday. Seas 1 metre or less.

Extended Forecast

Issued 03:00 AM ADT 12 August 2026
Friday Wind southwest 15 knots veering to northwest 15 in the afternoon.
Saturday Wind northwest 15 knots.
Sunday Wind light becoming southwest 15 knots late in the day.

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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

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 3:00 AM ADT 12 August 2026 Today Tonight and Thursday At 3:00 a.m. ADT today trough located from Anticosti Island to
Laurentian Fan.
By 10:00 a.m. ADT today trough located from Newfoundland to
Laurentian Fan.

At 8:00 p.m. ADT tonight departing trough located over the Grand
Banks.

At 3:00 a.m. ADT Thursday approaching trough located over southern
Quebec.

St. Lawrence - St. Lawrence River Area

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