FZUS61 KBUF 290209 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 PM EDT Sat Mar 28 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 strong 30.7 inch high over the Ohio Valley will move off the Mid Atlantic coast by Sunday. A 30.0 inch trough will sag southward across eastern Canada Monday, then move across the eastern Great Lakes Monday night, followed by a deeper 29.5 inch low Tuesday night into early Wednesday. Another 30.7 inch high across Quebec is then forecast to extend down across the lake Thursday. LOZ062-290900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 PM EDT Sat Mar 28 2026 .OVERNIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 2 to 4 feet. .SUNDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY NIGHT...Southwest winds 10 to 15 knots becoming south. A chance of showers in the evening, then showers likely overnight. Waves 1 to 3 feet. .TUESDAY...Southwest winds 15 to 25 knots becoming west to 30 knots. Showers with a chance of thunderstorms. Waves 3 to 5 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .WEDNESDAY...West winds 15 to 25 knots becoming northeast. Rain showers likely during the day. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .THURSDAY...Northeast winds to 30 knots becoming east. A chance of snow and rain showers. Waves 5 to 8 feet building to 6 to 9 feet. Waves occasionally around 11 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-290900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1009 PM EDT Sat Mar 28 2026 .OVERNIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY...South winds 15 to 20 knots becoming southwest 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south. Waves 2 feet or less. .MONDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY NIGHT...Southwest winds 5 to 10 knots becoming south. A chance of rain showers in the evening, then rain showers likely overnight. Waves 1 to 2 feet. .TUESDAY...South winds 10 to 15 knots becoming southwest and increasing to 15 to 25 knots. Showers with a chance of thunderstorms. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .WEDNESDAY...West winds 15 to 25 knots becoming northeast. Rain showers likely during the day. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet. .THURSDAY...Northeast winds 15 to 25 knots becoming east. A chance of rain and snow showers. Waves 3 to 6 feet building to 5 to 8 feet. Waves occasionally around 10 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-290900- MAFOR 2903/ ONTARIO WEST 1/2 11520 15510 11500. Waves 3 to 5 feet subsiding to 2 to 4 feet overnight. Waves 1 to 3 feet Sunday and Sunday evening. ONTARIO EAST 1/2 11620 11510 12410 12510 11500 11400. Waves 3 to 5 feet subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet Sunday. Waves 2 feet or less Sunday evening. $$