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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 21 June 2025

Today Tonight and Sunday.

Strong wind warning in effect.

Wind southeast 15 knots increasing to southeast 20 this afternoon then veering to southwest 20 this evening. Wind diminishing to southwest 15 late overnight and to southwest 10 Sunday morning.

Scattered showers this afternoon tonight and Sunday morning with a risk of thunderstorms. Fog patches dissipating near noon. Fog patches reforming overnight.

Waves

Issued 10:30 AM EDT 21 June 2025
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 near noon and to 1 to 1.5 early this evening. Waves subsiding to 0.5 to 1 early Sunday morning and to 0.5 or less near noon Sunday.

Extended Forecast

Issued 03:00 AM EDT 21 June 2025
Monday Wind southwest 15 knots.
Tuesday Wind light.
Wednesday Wind light.

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

Squall warning in effect

Southern Georgian Bay

Issued 1:08 PM EDT 21 June 2025 Squalls with wind gusts up to 45 knots, frequent lightning, hail of 1 to 2 centimetres and poor to very poor visibility in thunderstorms heavy at times are expected or occurring in the area.

A line of thunderstorm is moving east at 30 knots and will impact Georgian Bay early this afternoon.

Proceed with caution as visibility may suddenly be reduced to near zero. Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. If you must travel, keep others informed of your planned route and carry appropriate safety equipment including a GPS and satellite phone or marine radio.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Strong wind warning in effect

Georgian Bay

Issued 10:30 AM EDT 21 June 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 10:30 AM EDT 21 June 2025 Today Tonight and Sunday At 10:30 a.m. EDT today departing ridge located on a line
north-south over western Quebec.

At 10:30 a.m. EDT today low 992 mb located over South Dakota.
By 10:30 a.m. EDT Sunday low 1005 mb located over southern Quebec.

Great Lakes - Lake Huron Area

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