FZUS61 KBUF 291409 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 AM EDT Sun Mar 29 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 today. 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. LOZ062-292100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 AM EDT Sun Mar 29 2026 .THIS AFTERNOON...Southwest winds 15 to 20 knots. Waves 2 to 4 feet. .TONIGHT...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY...Southwest winds 10 to 15 knots. Waves 2 to 3 feet. .MONDAY NIGHT...Southwest winds 10 to 15 knots becoming south. A chance of showers in the evening, then showers overnight. Waves 1 to 3 feet. .TUESDAY...South winds 15 to 25 knots becoming southwest. Showers with a chance of thunderstorms. Waves 2 to 4 feet building to 3 to 6 feet. .WEDNESDAY...West winds 15 to 20 knots becoming northeast. Rain showers during the day, then a chance of rain showers Wednesday night. Waves 3 to 6 feet subsiding to 3 to 5 feet. .THURSDAY...Northeast winds to 30 knots becoming east. A chance of rain and snow showers during the day, then rain and snow showers likely Thursday night. Waves 5 to 8 feet building to 6 to 10 feet. Waves occasionally around 13 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-292100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1009 AM EDT Sun Mar 29 2026 .THIS AFTERNOON...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming south. Waves 1 to 3 feet. .MONDAY...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots becoming southeast. A chance of rain showers in the evening, then rain showers likely overnight. Waves 1 to 3 feet. .TUESDAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots. Showers with a chance of thunderstorms. Waves 1 to 3 feet building to 3 to 6 feet. .WEDNESDAY...West winds 15 to 20 knots becoming northeast. Rain showers with a chance of thunderstorms during the day, then a chance of rain showers Wednesday night. Waves 3 to 6 feet subsiding to 3 to 5 feet. .THURSDAY...Northeast winds 15 to 25 knots becoming east. A chance of rain and snow showers during the day, then rain and snow showers likely Thursday night. Waves 3 to 6 feet building to 5 to 8 feet. Waves occasionally around 10 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-292100- MAFOR 2915/ ONTARIO WEST 1/2 12520 12510 11410 13510. Waves 2 to 4 feet this afternoon. Waves 1 to 3 feet tonight and Monday morning. ONTARIO EAST 1/2 12510 11500 12400 12410 11510. Waves 2 to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 3 feet tonight and Monday morning. $$