Wave Height Forecasts for the Great Lakes and St. Lawrence River (On)

Choose a Province or Territory

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* NOTE: Corrected and/or amended bulletins are listed first *

 
FQCN23 CWTO 020700
Wave height forecasts for the Canadian portion of the Great Lakes
issued by Environment Canada at 3:00 a.m. EDT Wednesday 2 July 2025
for today tonight and Thursday.
The next scheduled forecast will be issued at 10:30 a.m. EDT.

Wave heights are for offshore and are forecast from trough to crest.
Nearshore waves may vary considerably due to shoreline effects.

Western Lake Superior.
Waves 0.5 metres or less.

Eastern Lake Superior.
Waves 0.5 metres or less.

Whitefish Bay.
Waves 0.5 metres or less subsiding to less than 0.5 near midnight.

Northern Lake Huron.
Waves 0.5 metres or less building to 1 overnight then subsiding to
0.5 or less Thursday afternoon.

Southern Lake Huron.
Waves 0.5 metres or less building to 0.5 to 1 near noon Thursday then
subsiding to 0.5 or less Thursday afternoon.

Georgian Bay.
Waves 1 metre subsiding to 0.5 or less early this morning then
building to 0.5 to 1 this afternoon. Waves subsiding to 0.5 or less
Thursday afternoon.

Lake St. Clair.
Waves 0.5 metres or less.

Western Lake Erie.
Waves 0.5 metres or less.

Eastern Lake Erie.
Waves 0.5 metres or less.

Western Lake Ontario.
Waves 0.5 metres or less building to 0.5 to 1 overnight.

Eastern Lake Ontario.
Waves 0.5 metres or less building to 0.5 to 1 this afternoon.

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