Grand Manan
Forecast
Marine Forecast
Issued 10:00 AM ADT 18 July 2025
Today Tonight and Saturday.
Strong wind warning in effect.
Wind northwest 15 to 20 knots increasing to northwest 25 near noon then diminishing to northwest 10 to 15 this afternoon. Wind diminishing to light this evening then increasing to southwest 10 to 15 near noon Saturday. Wind increasing to southwest 15 to 20 Saturday evening.
Showers and fog patches ending near noon with a risk of thunderstorms.
Waves
Issued 05:00 AM ADT 18 July 2025
Today Tonight and Saturday.
Seas 1 to 2 metres subsiding to 1 or less this evening then
building to 1 to 2 Saturday evening.
Extended Forecast
Issued 03:00 AM ADT 18 July 2025
Sunday
Wind southwest 15 to 20 knots.
Monday
Wind northwest 15 knots.
Tuesday
Wind northwest 15 knots backing to southwest
15.
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Weather Conditions
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Ice Conditions
Ice Forecasts
Issued 10:00 AM EDT 26 May 2025 Forecasts have ended for the season.Warnings
Warnings (In effect)
Strong wind warning in effect
Grand Manan
Issued 10:00 AM ADT 18 July 2025'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 or Weatheradio stations.
Synopsis
Technical Marine Synopsis
Issued 10:00 AM ADT 18 July 2025 Today Tonight and Saturday At 10:00 a.m. ADT today low 994 mb located north of AnticostiIsland.
By 10:00 a.m. ADT Saturday low 983 mb located over Labrador Sea.
At 8:00 p.m. ADT tonight ridge located west of the Marine District.
By 10:00 a.m. ADT Saturday ridge located over the southern Marine
District.
Marine Weather Statement
Issued 9:47 AM ADT 18 July 2025 A low pressure system north of Anticosti will intensify as is tracksnortheastward today to lie over the Labrador Sea Saturday morning.
Strong southerly winds will veer to strong to gale force westerlies
today in the wake of the system before diminishing tonight.
Marine interests are advised that gale warnings are in effect for
Chaleur - Miscou, Gulf - Magdalen and Anticosti.
St. Lawrence - St. Lawrence River Area
- Anticosti
- Beauport to L'Isle-aux-Coudres
- Browns Bank
- Chaleur - Miscou - eastern half
- Chaleur - Miscou - western half
- Cornwall to Montréal
- Donnacona to Beauport
- Fundy
- Grand Manan
- Gulf - Magdalen - western half
- Kingston to Cornwall
- Lake Memphrémagog - northern half
- Lake Nipissing
- Lake Saint-Jean
- Lurcher
- L'Isle-aux-Coudres to Tadoussac
- Montréal to Trois-Rivières
- Northumberland Strait - western half
- Pointe à Michel to Pointe-des-Monts
- Pointe-des-Monts to Anticosti - northern half
- Pointe-des-Monts to Anticosti - southern half
- Richelieu River and Northern Lake Champlain
- Saguenay to Tadoussac
- Tadoussac to Pointe à Michel
- Trois-Rivières to Donnacona
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