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Northern Georgian Bay

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Forecast

Marine Forecast

Issued 03:00 AM EST 16 December 2025

Today Tonight and Wednesday.

Gale warning in effect.

Wind west 15 knots backing to southwest 20 early this morning then increasing to southwest 35 early this evening. Wind diminishing to southwest 30 overnight then veering to northwest 25 Wednesday morning. Wind diminishing to northwest 15 Wednesday afternoon then becoming south 15 Wednesday evening.

Scattered flurries ending this evening with a risk of freezing drizzle. Scattered showers overnight and Wednesday morning. Risk of freezing drizzle late overnight.

Waves

Issued 03:00 AM EST 16 December 2025
Today Tonight and Wednesday. Waves 0.5 to 1 metre building to 1 to 1.5 this morning and to 2 to 3 this afternoon. Waves subsiding to 1 to 1.5 Wednesday afternoon and to 0.5 to 1 Wednesday evening.

Extended Forecast

Issued 03:00 AM EST 16 December 2025
Thursday Wind south 25 knots veering to southwest 30 late in the day.
Friday Wind southwest 30 knots diminishing to light late in the day.
Saturday Wind light becoming southwest 15 knots.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
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land station Land Station
Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Gale warning in effect

Northern Georgian Bay

Issued 03:00 AM EST 16 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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 3:00 AM EST 16 December 2025 Today Tonight and Wednesday At 3:00 a.m. EST today ridge located on a line northeast-southwest
over North Carolina.
By 3:00 a.m. EST Wednesday ridge located on a line
northeast-southwest over the Eastern Seaboard.

At 3:00 a.m. EST today low 987 mb located over eastern Saskatchewan.
By 3:00 a.m. EST Wednesday trough from low located on a line
northeast-southwest over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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