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Western Lake Ontario


Marine Forecast

Issued 10:30 AM EDT 13 June 2021

Today Tonight and Monday.

Wind light becoming west 10 knots late overnight then increasing to southwest 15 Monday morning. Wind diminishing to variable 10 Monday afternoon then increasing to northwest 15 Monday evening.

Scattered showers this afternoon and this evening with a risk of thunderstorms. Scattered showers Monday late in the day with a risk of thunderstorms.


Issued 10:30 AM EDT 13 June 2021
Today Tonight and Monday. Waves one half metre or less.

Extended Forecast

Issued 06:30 PM EDT 12 June 2021
Monday Wind west 15 knots.
Tuesday Wind west 15 knots veering to northwest 20 late in the day.
Wednesday Wind northwest 20 knots.

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Weather Conditions

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas N Huron - 45003 W Erie - 45005 S Huron - 45008 Lake Ontario - 45012 Port Stanley - 45132 Prince Edward Point - 45135 Georgian Bay - 45137 Grimsby - 45139 Port Colborne - 45142 South Georgian Bay - 45143 Lake St Clair - 45147 South Lake Huron - 45149 Lake Simcoe - 45151 Lake Nipissing - 45152 North Channel - 45154 Ajax - 45159 Sault Ste. Marie Airport Killarney Greater Sudbury Airport North Bay Airport Gore Bay-Manitoulin Airport Great Duck Island Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Cove Island Goderich Sarnia Chris Hadfield Airport Tobermory Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal Vineland Station Welland-Pelham Windsor Airport Port Colborne Erieau Point Pelee Burlington Lift Bridge Cobourg Hamilton Munro Int'l Airport Oshawa Executive Airport Point Petre Toronto City Centre Airport CFB Trenton Peterborough Municipal Airport
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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 9 May 2021 Forecasts have ended for the season.

No watches or warnings in effect.


Technical Marine Synopsis

Issued 10:30 AM EDT 13 June 2021 Today Tonight and Monday At 10:30 a.m. EDT today trough located on a line northwest-southeast
over northern Ontario.
By 10:30 a.m. EDT Monday trough located from Quebec to Lake Erie.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over Iowa.
By 10:30 a.m. EDT Monday ridge located from Lake Winnipeg to Iowa.

Great Lakes - Lake Erie and Lake Ontario Area

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