Western Lake Ontario
Forecast
Marine Forecast
Issued 03:00 AM EDT 12 July 2025
Today Tonight and Sunday.
Wind light becoming southeast 10 knots this afternoon then veering to southwest 10 near midnight. Wind becoming light Sunday evening.
Scattered showers ending this morning with a risk of thunderstorms. Scattered showers tonight and Sunday with a risk of thunderstorms.
Waves
Issued 03:00 AM EDT 12 July 2025
Today Tonight and Sunday.
Waves 0.5 metres or less.
Extended Forecast
Issued 03:00 AM EDT 12 July 2025
Monday
Wind light becoming southwest 15 knots late in
the day.
Tuesday
Wind southwest 15 knots diminishing to
light.
Wednesday
Wind light.
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Weather Conditions
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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
No watches or warnings in effect.
Synopsis
Technical Marine Synopsis
Issued 3:00 AM EDT 12 July 2025 Today Tonight and Sunday At 3:00 a.m. EDT today trough located on a line north-south overwestern Lake Superior.
By 3:00 a.m. EDT Sunday trough located on a line north-south over
southern Ontario.
At 3:00 a.m. EDT today high 1022 mb located over eastern Wyoming.
By 3:00 a.m. EDT Sunday high 1018 mb located over Indiana.
Great Lakes - Lake Erie and Lake Ontario Area
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