FZUS61 KBUF 202003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Fri Mar 20 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 29.8 inch low over the upper Great Lakes will move southeast across New York State this afternoon, before sliding off the east coast tonight. A 30.0 inch high will then build across the lake Saturday, before a 29.6 inch low crosses the lower Great Lakes Sunday and slides off the mid-Atlantic coast Monday. A 30.4 inch high is forecast to build across the upper Great Lakes Monday, and the lower Great Lakes Tuesday. LOZ062-210300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Fri Mar 20 2026 .TONIGHT...Northeast winds 15 to 20 knots becoming northwest and diminishing to 5 to 10 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 5 to 10 knots becoming northeast. Waves 1 foot or less. .SATURDAY NIGHT...East winds 5 to 10 knots. A chance of rain and snow showers in the evening, then rain showers likely overnight. Waves 1 foot or less. .SUNDAY...Northeast winds 10 to 15 knots. Rain showers likely. Waves 1 to 3 feet. .SUNDAY NIGHT...Northeast winds 10 to 15 knots increasing to 15 to 20 knots. Rain showers likely in the evening, then a chance of rain showers overnight. Waves 3 to 5 feet. .MONDAY...North winds 15 to 20 knots becoming northwest. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TUESDAY...West winds 5 to 15 knots increasing to 15 to 20 knots. A chance of snow showers Tuesday night. Waves 1 to 3 feet building to 3 to 5 feet. .WEDNESDAY...Northwest winds 15 to 25 knots becoming northeast. A chance of snow showers during the day. Waves 3 to 5 feet. $$ LOZ063-064-210300- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 403 PM EDT Fri Mar 20 2026 .TONIGHT...Northeast winds 15 to 20 knots becoming northwest 5 to 15 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 knots or less becoming north. Waves 1 foot or less. .SATURDAY NIGHT...East winds 5 to 10 knots becoming southeast. Rain and snow showers likely overnight. Waves 2 feet or less. .SUNDAY...South winds 10 to 15 knots becoming north. Rain showers. Waves 1 to 3 feet. .SUNDAY NIGHT...Northeast winds 15 to 20 knots. Rain showers likely in the evening, then a chance of rain and snow showers overnight. Waves 2 to 4 feet building to 3 to 6 feet. .MONDAY...North winds 15 to 20 knots becoming northwest. A chance of snow showers during the day. Waves 3 to 6 feet subsiding to 2 to 4 feet. .TUESDAY...Northwest winds 5 to 15 knots becoming west and increasing to 15 to 25 knots. A chance of snow showers Tuesday night. Waves 2 to 4 feet building to 3 to 6 feet. .WEDNESDAY...Northwest winds 15 to 25 knots becoming northeast. A chance of snow showers during the day. Waves 3 to 6 feet subsiding to 3 to 5 feet. $$ LOZ065-210300- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 403 PM EDT Fri Mar 20 2026 .TONIGHT...North winds 5 to 15 knots. Waves 2 feet or less. .SATURDAY...Northwest winds 10 knots or less becoming north. Waves 1 foot or less. .SATURDAY NIGHT...Light and variable winds becoming southeast around 10 knots. A chance of snow showers in the evening, then snow and rain showers overnight. Waves 1 foot or less. .SUNDAY...Southeast winds 10 to 15 knots becoming north. Rain and snow showers in the morning, then rain showers in the afternoon. Waves 2 feet or less. .SUNDAY NIGHT...Northeast winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain showers in the evening, then a chance of snow and rain showers overnight. Waves 1 to3 feet building to 2 to 4 feet. .MONDAY...North winds 15 to 20 knots diminishing to 10 to 15 knots. A chance of snow showers during the day. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 5 to 15 knots becoming southwest 15 to 20 knots. A chance of snow showers Tuesday night. Waves 1 to 3 feet building to 3 to 6 feet. .WEDNESDAY...Northwest winds 15 to 20 knots becoming northeast. A chance of snow showers during the day. Waves 3 to 6 feet subsiding to 2 to 4 feet. $$ LOZ061-210300- MAFOR 2021/ ONTARIO WEST 1/2 11120 11110 11800 12700 12800 11100. Waves 1 to 3 feet tonight. Waves 1 foot or less Saturday. ONTARIO EAST 1/2 11810 11110 11810 11800 12700 12800. Waves 1 to 3 feet tonight. Waves 1 foot or less Saturday. $$