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L'Isle-aux-Coudres to Tadoussac

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 18 July 2026

Today Tonight and Sunday.

Strong wind warning in effect.

Wind southwest 10 to 20 knots becoming light this afternoon then increasing to northeast 10 to 15 early this evening. Wind increasing to northwest 15 to 25 overnight then becoming northwest 15 Sunday evening.

Showers today tonight and Sunday morning. Risk of thunderstorms tonight. Fog banks forming this evening and dissipating Sunday morning. Visibility as low as 1 mile in showers and 1 mile or less in fog banks.

Waves

Issued 03:00 AM EDT 18 July 2026
Today Tonight and Sunday. Seas 1 metre or less.

Extended Forecast

Issued 06:00 PM EDT 17 July 2026
Sunday Wind northwest 10 to 20 knots.
Monday Wind southwest 15 to 20 knots.
Tuesday Wind south 15 knots.

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

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Strong wind warning in effect

L'Isle-aux-Coudres to Tadoussac

Issued 03:00 AM EDT 18 July 2026

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 18 July 2026 Today Tonight and Sunday At 3:00 a.m. EDT today ridge located on a line northeast-southwest
over Trois-Rivières.
By 8:00 a.m. EDT Sunday dissipating ridge located on a line
northwest-southeast over the Strait of Belle Isle.

At 3:00 a.m. EDT today intensifying low 1005 mb located over
northern Lake Michigan.
By 8:00 p.m. EDT Sunday low 987 mb located over western Anticosti
Island.

At 8:00 p.m. EDT tonight ridge located on a line north-south over
Lake Superior.
By 8:00 p.m. EDT Sunday ridge located on a line north-south over
Lake Huron.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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