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Trois-Rivières to Donnacona

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 21 July 2026

Today Tonight and Wednesday.

Wind light becoming southerly 10 to 15 knots early this morning then becoming light this evening. Wind increasing to southwest 15 to 20 Wednesday morning.

Showers tonight and Wednesday. Risk of thunderstorms this evening. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 21 July 2026
Thursday Wind southwest 15 to 20 knots diminishing to southwest 10 to 15 late in the day.
Friday Wind southwest 10 to 15 knots.
Saturday Wind light.

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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

Watches (In effect)

Squall watch in effect

Trois-Rivières to Donnacona

Issued 10:03 AM EDT 21 July 2026 Today, between 3 pm and 8 pm, conditions will be favourable for the development of squalls accompanied by gusts of up to 45 knots and frequent lightning.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 21 July 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today departing low 993 mb located off Labrador.

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

At 3:00 a.m. EDT today trough located on a line north-south over
Lake Superior.
By 8:00 p.m. EDT Wednesday trough located on a line north-south
over Tadoussac.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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