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Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 PM EDT Sun Oct 11 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 high pressure ridge averaging 30.1 inches continues to slowly exit eastward and briefly replaced by a weak trough averaging 29.8 inches. Behind the trough, a weak ridge averaging 29.9 inches slides eastward across the lake on Monday, exits eastward Monday night, and is followed by a cold front sweeping southeastward across the lake on Tuesday. Behind the cold front, a ridge averaging 30.2 inches builds from northern Ontario through Thursday. A 29.9 inch low may move across the Great Lakes region Friday. This low has the potential to deepen into a stronger low. LOZ062-120300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 PM EDT Sun Oct 11 2026 .TONIGHT...East winds 10 knots or less becoming north. A chance of rain this evening. Waves 2 feet or less. .MONDAY...West winds 10 knots or less becoming southwest. Waves 1 foot or less. .MONDAY NIGHT...South winds 5 to 15 knots becoming southwest. A chance of showers overnight. Waves 2 feet or less. .TUESDAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Showers. Waves 1 to 3 feet building to 2 to 4 feet. .TUESDAY NIGHT...Southwest winds 15 to 20 knots becoming northwest 10 to 15 knots. Showers in the evening, then a chance of showers overnight. Waves 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 15 knots becoming north. Waves 1 to 3 feet. .THURSDAY...Northeast winds 5 to 15 knots becoming southeast 15 to 20 knots. Showers likely Thursday night. Waves 1 to 3 feet. .FRIDAY...South winds 15 to 20 knots becoming northwest and increasing to 30 knots. Showers likely during the day, then a chance of showers Friday night. Waves 2 to 4 feet building to 7 to 11 feet. Waves occasionally around 14 feet. $$ LOZ063>065-120300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 PM EDT Sun Oct 11 2026 .TONIGHT...Southeast winds 10 knots or less becoming south. Rain likely this evening, then a chance of rain after midnight. Waves 2 feet or less. .MONDAY...West winds 10 knots or less. Waves 1 foot or less. .MONDAY NIGHT...Southwest winds 5 to 15 knots becoming south. A chance of showers overnight. Waves 2 feet or less. .TUESDAY...South winds 10 to 15 knots becoming southwest. Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 15 to 20 knots becoming northwest 10 to 15 knots. Showers with a chance of thunderstorms in the evening, then showers likely overnight. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 15 knots becoming north 15 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet. .THURSDAY...North winds 15 to 20 knots becoming southeast. Showers likely Thursday night. Waves 2 to 4 feet subsiding to 1 to 3 feet. .FRIDAY...South winds 15 to 25 knots becoming northwest and increasing to 35 knot gales. Showers likely. Waves 3 to 6 feet building to 9 to 13 feet. Waves occasionally around 16 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-120300- MAFOR 1121/ ONTARIO WEST 1/2 12200 11300 11200 11700 13600. A chance of rain this evening. Waves 2 feet or less. ONTARIO EAST 1/2 14300 11500 13600. A chance of rain tonight. Waves 2 feet or less. $$