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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 18 June 2026

Today Tonight and Friday.

Strong wind warning in effect.

Wind variable 10 knots increasing to northwest 20 this afternoon then backing to west 20 near midnight. Wind diminishing to west 15 Friday evening.

Scattered showers ending overnight. Risk of thunderstorms late this morning. Fog patches dissipating this evening.

Waves

Issued 10:30 AM EDT 18 June 2026
Today Tonight and Friday. Waves 1 metre subsiding to 0.5 or less near noon then building to 1 to 1.5 early this evening. Waves subsiding to 0.5 to 1 Friday evening.

Extended Forecast

Issued 03:00 AM EDT 18 June 2026
Saturday Wind northwest 15 knots diminishing to light late in the day.
Sunday Wind light.
Monday Wind light becoming north 15 knots late in the day.

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

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

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Strong wind warning in effect

Southern Georgian Bay

Issued 10:30 AM EDT 18 June 2026

'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.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 18 June 2026 Today Tonight and Friday At 10:30 a.m. EDT today low 991 mb located over eastern Ontario.
By 10:30 p.m. EDT Friday departing low 990 mb located over the
Gulf of St. Lawrence.

By 10:30 a.m. EDT Friday ridge located on a line north-south over
northwestern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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