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Forecast

Marine Forecast

Issued 03:00 AM AST 09 December 2025

Today Tonight and Wednesday.

Wind westerly 15 knots increasing to southwest 25 after midnight then veering to west 15 to 20 near noon Wednesday. Wind diminishing to light Wednesday afternoon then increasing to south 25 Wednesday evening.

Showers or flurries overnight and Wednesday morning. Showers Wednesday evening.

Temperatures minus 6 rising to plus 8 Wednesday evening.

Waves

Issued 05:00 AM AST 09 December 2025
Today Tonight and Wednesday. Seas 1 to 2 metres subsiding to 1 or less this morning then building to 1 to 2 near midnight.

Extended Forecast

Issued 03:00 AM AST 09 December 2025
Thursday Wind southwest 25 to 35 knots becoming northwest 25 in the afternoon.
Friday Wind west 25 to 35 knots.
Saturday Wind west 25 knots diminishing to west 15.

Ice Forecast

Issued 10:00 AM EST 8 December 2025 Today Tonight and Tuesday Open water. 

[ Canadian Ice Service ]

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

Ice Forecasts

Issued 10:00 AM EST 8 December 2025 Today Tonight and Tuesday

Ice Edge

First ice edge estimated from 4723N 6136W to 4738N 6112W to 4744N
6124W to 4734N 6159W to 4706N 6212W to 4706N 6147W to 4723N 6136W.
Sea ice within the ice edge.

Second ice edge estimated from Nova Scotia near 4546N 6254W to 4558N
6310W to Prince Edward Island near 4558N 6250W. Sea ice west of the
ice edge.

Third ice edge estimated from Prince Edward Island near 4630N 6319W
to 4741N 6431W to 4827N 6402W to 4904N 6404W to 4925N 6516W to 4916N
6703W to 4956N 6635W to Anticosti Island near 4924N 6336W. Sea ice
west then north of the ice edge.

Fourth ice edge estimated from Anticosti Island near 4949N 6317W to
4946N 5954W to Quebec near 5125N 5736W. Sea ice north of the ice
edge.

Ice Coverage

Open water.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM AST 9 December 2025 Today Tonight and Wednesday At 3:00 a.m. AST today departing low 975 mb located east of
Newfoundland.

At 3:00 a.m. AST today ridge located over New England.
By 8:00 p.m. AST tonight ridge located over the southern Marine
District.

At 8:00 p.m. AST tonight approaching trough located over New
England.

Marine Weather Statement

Issued 2:50 AM AST 9 December 2025 A low pressure system east of Newfoundland will continue departing
today. Strong to gale force northwesterlies will diminish slightly as
the low pulls away.

A trough of low pressure will approach tonight and cross the marine
district Wednesday. Strong to potentially gale force southwesterlies
will develop ahead of this feature.

Marine interests are advised that gale warnings are in effect for
Banquereau, Cabot Strait, Gulf - Magdalen - northern half, Chaleur -
Miscou, and Anticosti.

Freezing spray warnings are in effect for Grand Manan, Lurcher,
southwestern shore, eastern shore, Fourchu, Cabot Strait, and all
Gulf of St. Lawrence waters.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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