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Marine Forecast

Issued 03:00 AM ADT 21 July 2026

Today Tonight and Wednesday.

Strong wind warning in effect.

Wind southwesterly 10 to 15 knots increasing to southeast 15 to 20 this afternoon and to southeast 25 this evening. Wind veering to southwesterly 25 Wednesday morning.

Rain beginning near midnight with a risk of thunderstorms changing to scattered showers Wednesday morning. Fog patches forming overnight.

Waves

Issued 05:00 AM ADT 21 July 2026
Today Tonight and Wednesday. Seas 1 metre or less building to 1 to 2 this evening and to 2 to 3 Wednesday morning. Seas building to 3 to 4 Wednesday afternoon.

Extended Forecast

Issued 03:00 AM ADT 21 July 2026
Thursday Wind southwesterly 15 knots.
Friday Wind variable 10 to 15 knots.
Saturday Wind variable 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

Ice Forecasts

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

Warnings (In effect)

Strong wind warning in effect

Lurcher

Issued 03:00 AM ADT 21 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 ADT 21 July 2026 Today Tonight and Wednesday At 3:00 a.m. ADT today ridge located over the southern Marine
District.
By 3:30 p.m. ADT today departing ridge located over the Grand Banks.

At 8:00 p.m. ADT tonight trough located over New England.
By 3:30 p.m. ADT Wednesday trough located over the western Marine
District.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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