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Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 AM EDT Mon Jun 15 2026 For waters beyond five nautical miles of shore on Lake Ontario Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...A 29.9 inch high will build across the region today, then will exit off to our east Tuesday. A 29.4 inch low will then track north of the lake on Wednesday, with its trailing cold front approaching the lake late in the day on Wednesday. A second 29.4 inch surface low will then track from the upper Great Lakes to southern Quebec Wednesday night and Thursday, while pushing its warm front across the lake later Wednesday night and early Thursday, followed by its trailing cold front later Thursday. The low will then make its way to the Canadian Maritimes Friday, while a 29.9 inch high builds across the upper Great Lakes. LOZ062-152100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 AM EDT Mon Jun 15 2026 .THIS AFTERNOON...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to 3 feet. .TUESDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming south. Showers likely overnight. Waves 1 to 2 feet. .WEDNESDAY...South winds 10 to 15 knots becoming southeast 15 to 20 knots. Showers likely during the day, then showers with a chance of thunderstorms Wednesday night. Waves 1 to 3 feet. .THURSDAY...South winds to 30 knots becoming west and diminishing to 15 to 20 knots. Showers with a chance of thunderstorms during the day, then a chance of showers Thursday night. Waves 3 to 6 feet building to 5 to 8 feet, then subsiding to 3 to 6 feet. Waves occasionally around 10 feet. .FRIDAY...West winds 15 to 20 knots. Waves 3 to 5 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-152100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 AM EDT Mon Jun 15 2026 .THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to 6 feet. .TONIGHT...West winds 15 to 20 knots becoming southwest 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TUESDAY...Southwest winds 5 to 15 knots becoming south. Waves 2 feet or less. .TUESDAY NIGHT...South winds 5 to 15 knots. A chance of showers overnight. Waves 2 feet or less. .WEDNESDAY...South winds 5 to 15 knots becoming southeast 15 to 20 knots. A chance of showers during the day, then showers likely with a chance of thunderstorms Wednesday night. Waves 1 to 3 feet. .THURSDAY...South winds to 30 knots becoming west and diminishing to 15 to 20 knots. Showers with a chance of thunderstorms during the day, then a chance of showers Thursday night. Waves 5 to 8 feet. Waves occasionally around 10 feet. .FRIDAY...West winds 15 to 25 knots. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-152100- MAFOR 1515/ ONTARIO WEST 1/2 11620 12510 14500 11500. Waves 3 to 5 feet subsiding to 2 to 4 feet this afternoon. Waves 1 to 3 feet tonight and Tuesday morning. ONTARIO EAST 1/2 11630 12620 12610 12500 11510. Waves 3 to 6 feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet Tuesday morning. $$