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L'Isle-aux-Coudres to Tadoussac

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Forecast

Marine Forecast

Issued 03:00 AM EDT 19 August 2026

Today Tonight and Thursday.

Wind light increasing to southwest 15 to 20 knots this morning then diminishing to southwest 10 to 15 near midnight. Wind increasing to southwest 15 to 20 near noon Thursday then diminishing to southwest 10 to 15 Thursday evening.

Showers this afternoon and this evening with a risk of thunderstorms. Scattered showers Thursday afternoon and evening. Fog banks forming early this morning and dissipating near noon. Fog banks forming overnight and dissipating Thursday morning.

Waves

Issued 03:00 PM EDT 18 August 2026
Tonight and Wednesday. Seas 1 metre or less.

Extended Forecast

Issued 06:00 PM EDT 18 August 2026
Thursday Wind light becoming southwest 10 to 15 knots in the afternoon.
Friday Wind light increasing to southwest 15 to 20 knots.
Saturday 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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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 AM EDT 19 August 2026 Today Tonight and Thursday At 3:00 a.m. EDT today dissipating ridge located from the Quebec
Lower North Shore to Sept-Îles.

At 3:00 a.m. EDT today trough located from James Bay to Lake
Ontario.
By 8:00 p.m. EDT Thursday trough located from the Quebec Lower
North Shore to Québec city.

At 8:00 p.m. EDT Thursday approaching high 1018 mb located near
Montréal.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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