FZUS61 KBUF 201403 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1003 AM 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. LOZ062-202100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1003 AM EDT Fri Mar 20 2026 .REST OF TODAY...Southeast winds 15 to 20 knots becoming northeast. Rain. Waves 2 to 4 feet. .TONIGHT...Northeast winds 10 to 15 knots becoming northwest. Waves 1 to 3 feet. .SATURDAY...Northwest winds 5 to 10 knots becoming east. Waves 1 foot or less. .SATURDAY NIGHT...East winds 5 to 10 knots. A chance of rain and snow overnight. Waves 1 foot or less. .SUNDAY...East winds 10 to 15 knots becoming northeast 15 to 20 knots. Rain likely with a chance of snow during the day, then rain likely with a chance of snow showers Sunday night. Waves 1 to 3 feet building to 3 to 5 feet. .MONDAY...North winds 15 to 20 knots becoming northwest. A chance of snow showers during the day. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TUESDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 3 feet building to 3 to 5 feet. $$ LOZ063-064-202100- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 1003 AM EDT Fri Mar 20 2026 .REST OF TODAY...Southeast winds 15 to 20 knots becoming north. Rain with snow likely late this morning, then rain early this afternoon. A chance of rain late. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TONIGHT...Northeast winds 10 to 15 knots becoming north. Waves 1 to 3 feet. .SATURDAY...Northwest winds 5 to 10 knots becoming north. Waves 1 foot or less. .SATURDAY NIGHT...East winds 5 to 10 knots becoming southeast. Rain and snow likely overnight. Waves 2 feet or less. .SUNDAY...Southeast winds 10 to 15 knots becoming northeast 15 to 20 knots. Rain and snow likely during the day, then rain likely with a chance of snow showers Sunday night. Waves 1 to 3 feet building to 3 to 6 feet. .MONDAY...North winds 15 to 20 knots becoming northwest. A chance of snow showers during the day. Waves 3 to 6 feet subsiding to 2 to 4 feet. .TUESDAY...Northwest winds 15 to 20 knots becoming west. A chance of rain and snow showers Tuesday night. Waves 2 to 4 feet building to 3 to 6 feet. $$ LOZ065-202100- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 1003 AM EDT Fri Mar 20 2026 .REST OF TODAY...Southeast winds 10 to 15 knots becoming northeast 15 to 20 knots. Rain and snow, then rain likely late. Waves 1 to 3 feet. .TONIGHT...Northeast winds 10 to 15 knots becoming north. Waves 2 feet or less. .SATURDAY...Northwest winds 5 to 10 knots. Waves 1 foot or less. .SATURDAY NIGHT...South winds 10 knots or less becoming southeast. Snow and rain likely overnight. Waves 1 foot or less. .SUNDAY...Southeast winds 10 to 15 knots becoming northeast 15 to 20 knots. Rain and snow likely during the day, then a chance of rain and snow showers Sunday night. Waves 1 to 3 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 10 to 15 knots becoming west 15 to 20 knots. A chance of snow showers Tuesday night. Waves 1 to 3 feet building to 3 to 6 feet. $$ LOZ061-202100- MAFOR 2015/ ONTARIO WEST 1/2 11316 13110 12800 12700. Waves 2 to 4 feet this afternoon. Waves 1 to 3 feet tonight and Saturday morning. ONTARIO EAST 1/2 11326 11110 12810 12800 12700. Waves 1 to 3 feet this afternoon and tonight. Waves 1 foot or less Saturday morning. $$