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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 20 July 2026

Today Tonight and Tuesday.

Strong wind warning in effect.

Wind light becoming southwest 10 to 15 knots near noon then becoming light near midnight. Wind increasing to southerly 15 Tuesday morning and to south 15 to 25 near noon Tuesday.

Showers Tuesday late in the day with a risk of thunderstorms.

Extended Forecast

Issued 06:00 AM EDT 20 July 2026
Wednesday Wind south 15 knots increasing to southwest 15 to 25 in the afternoon.
Thursday Wind southwest 15 to 20 knots.
Friday Wind southwest 10 to 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

Cornwall to Montréal

Issued 03:00 AM EDT 20 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 20 July 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today low 988 mb located north of Natashquan.
By 2:00 a.m. EDT Tuesday low 994 mb located off Labrador.

At 3:00 a.m. EDT today ridge located on a line north-south over
Lake Ontario.
By 8:00 p.m. EDT Tuesday dissipating ridge located from Newfoundland
to Natashquan.

At 8:00 p.m. EDT tonight trough located on a line north-south over
Lake Superior.
By 8:00 p.m. EDT Tuesday trough located on a line north-south over
Lake Ontario.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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