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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 12 July 2025

Today Tonight and Sunday.

Wind southeast 10 knots increasing to south 15 to 20 this afternoon then becoming southwest 15 this evening. Wind diminishing to southwest 10 late overnight. Wind southwest 10 Sunday.

Scattered showers this afternoon tonight and Sunday morning with a risk of thunderstorms. Fog patches.

Waves

Issued 10:30 AM EDT 12 July 2025
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 early this evening then subsiding to 0.5 or less early Sunday morning.

Extended Forecast

Issued 03:00 AM EDT 12 July 2025
Monday Wind light.
Tuesday Wind light.
Wednesday Wind light becoming northeast 15 knots late in the day.

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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
Legend:
buoy Buoy
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

Watches (In effect)

Squall watch in effect

Southern Georgian Bay

Issued 11:38 AM EDT 12 July 2025 Thunderstorms this afternoon and this evening may produce very strong wind gusts up to 45 knots.

Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous. 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.

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 10:30 AM EDT 12 July 2025 Today Tonight and Sunday At 10:30 a.m. EDT today trough located on a line north-south over
Lake Superior.
By 10:30 a.m. EDT Sunday trough located on a line north-south over
eastern Ontario.

At 10:30 a.m. EDT today ridge located on a line north-south over
South Dakota.
By 10:30 a.m. EDT Sunday ridge located on a line north-south
over Illinois.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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