Southern Georgian Bay
Forecast
Marine Forecast
Issued 10:30 AM EDT 12 July 2025
Today Tonight and Sunday.
Wind southeast 10 knots increasing to south 15 to 20 this afternoon then becoming southwest 15 this evening. Wind diminishing to southwest 10 late overnight. Wind southwest 10 Sunday.
Scattered showers this afternoon tonight and Sunday morning with a risk of thunderstorms. Fog patches.
Waves
Issued 10:30 AM EDT 12 July 2025
Today Tonight and Sunday.
Waves 0.5 metres or less building to 0.5 to 1 early this evening
then subsiding to 0.5 or less early Sunday morning.
Extended Forecast
Issued 03:00 AM EDT 12 July 2025
Monday
Wind light.
Tuesday
Wind light.
Wednesday
Wind light becoming northeast 15 knots late
in the day.
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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
Watches (In effect)
Squall watch in effect
Southern Georgian Bay
Issued 11:38 AM EDT 12 July 2025 Thunderstorms this afternoon and this evening may produce very strong wind gusts up to 45 knots.Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous. Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Synopsis
Technical Marine Synopsis
Issued 10:30 AM EDT 12 July 2025 Today Tonight and Sunday At 10:30 a.m. EDT today trough located on a line north-south overLake Superior.
By 10:30 a.m. EDT Sunday trough located on a line north-south over
eastern Ontario.
At 10:30 a.m. EDT today ridge located on a line north-south over
South Dakota.
By 10:30 a.m. EDT Sunday ridge located on a line north-south
over Illinois.
Great Lakes - Lake Erie and Lake Ontario Area
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