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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 08:40 PM EST 04 March 2026

Tonight and Thursday.

Wind light becoming northeast 10 knots near midnight then increasing to northeast 15 late overnight. Wind increasing to northeast 20 Thursday morning and to northeast 25 early Thursday evening.

Periods of rain Thursday late in the day. Fog patches dissipating early Thursday morning.

Waves

Issued 06:30 PM EST 04 March 2026
Tonight and Thursday. Waves 0.5 metres or less building to 1 early Thursday morning and to 1.5 near noon Thursday.

Extended Forecast

Issued 06:30 PM EST 04 March 2026
Friday Wind northeast 20 knots diminishing to light in the afternoon then becoming southeast 15 late in the day.
Saturday Wind southwest 15 knots increasing to southwest 20.
Sunday Wind west 15 knots increasing to southwest 25 late in the day.

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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EST 4 March 2026 Tonight and Thursday At 6:30 p.m. EST tonight departing ridge located on a line
northeast-southwest over southern Ontario.

At 6:30 p.m. EST tonight ridge located on a line northwest-southeast
over northern Ontario.
By 6:30 p.m. EST Thursday departing ridge located on a line
east-west over central Quebec.

At 6:30 p.m. EST tonight low 1017 mb located over southern Illinois.
By 6:30 p.m. EST Thursday low 1012 mb located over western Lake
Erie.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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