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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 19 June 2025

Today Tonight and Friday.

Strong wind warning in effect.

Wind south 15 knots increasing to southwest 25 this afternoon then veering to west 20 this evening. Wind diminishing to west 15 early Friday morning then backing to southwest 15 near noon Friday. Wind diminishing to southwest 10 Friday evening.

Scattered showers ending overnight. Risk of thunderstorms late this afternoon and this evening. Scattered showers Friday late in the day with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 19 June 2025
Today Tonight and Friday. 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 Friday morning and to 0.5 or less Friday evening.

Extended Forecast

Issued 03:00 AM EDT 19 June 2025
Saturday Wind light increasing to southwest 20 knots late in the day.
Sunday Wind southwest 20 knots.
Monday Wind 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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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)

Strong wind warning in effect

Eastern Lake Ontario

Issued 10:30 AM EDT 19 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 19 June 2025 Today Tonight and Friday At 10:30 a.m. EDT today low 999 mb located over southern Georgian
Bay.
By 10:30 a.m. EDT Friday low 996 mb located over northern New
Brunswick.

At 10:30 a.m. EDT today ridge located on a line east-west over
northern Ontario.
By 10:30 a.m. EDT Friday ridge located on a line northeast-southwest
over northeastern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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