FZUS61 KBUF 152003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Thu Oct 15 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 30.4 inch high will drift east across Quebec and New England through tonight. Meanwhile, a 29.5 inch low will move from southern lower Michigan tonight to just north of the Lake Friday morning, while pushing an attendant warm front across the Lake. The low will then reach the Saint Lawrence Valley by late Friday afternoon, while dragging an attendant cold front across the Lake. This low will deepen to 29.1 inches as it moves from the Saint Lawrence Valley Friday night to the Canadian Maritimes Saturday. A strong and broad 30.6 inch high is then forecast to build from the Ohio Valley Saturday night to the Mid Atlantic and southern New England by Sunday night, before drifting south of the Canadian Maritimes Monday. Another 30.4 inch high over northwestern Ontario Province will then build southeast across the lower Great Lakes Monday night into Tuesday. LOZ062-160300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Thu Oct 15 2026 .TONIGHT...East winds 15 to 20 knots becoming southeast 10 to 15 knots. Rain likely late this evening. Rain after midnight. Waves 3 to 5 feet subsiding to 2 to 4 feet. .FRIDAY...Southwest winds 15 to 20 knots becoming northwest and increasing to 30 knots. Rain in the morning, then a chance of rain in the afternoon. Waves 2 to 4 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .FRIDAY NIGHT...Northwest winds to 30 knots becoming north. Waves 5 to 8 feet. Waves occasionally around 10 feet. .SATURDAY...North winds 15 to 25 knots becoming west and diminishing to 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .SATURDAY NIGHT...West winds 10 to 15 knots increasing to 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .SUNDAY...Southwest winds 15 to 20 knots. Waves 3 to 5 feet. .MONDAY...Southwest winds 5 to 15 knots becoming west. Waves 2 to 4 feet subsiding to 2 feet or less. .TUESDAY...Northwest winds less than 10 knots becoming northeast. Waves 1 foot or less. $$ LOZ063>065-160300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 403 PM EDT Thu Oct 15 2026 .TONIGHT...East winds 10 to 15 knots becoming southeast and increasing to 30 knots after midnight. A chance of rain late this evening. Rain after midnight. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .FRIDAY...South winds to 30 knots becoming west. Rain through early afternoon, then a chance of rain late. Waves 4 to 7 feet building to 6 to 9 feet. Waves occasionally around 11 feet. .FRIDAY NIGHT...Northwest winds to 30 knots becoming north. A chance of rain in the evening. Waves 5 to 9 feet. Waves occasionally around 11 feet. .SATURDAY...North winds to 30 knots becoming northwest and diminishing to 10 to 15 knots in the afternoon. Waves 5 to 8 feet subsiding to 2 to 4 feet. Waves occasionally around 10 feet. .SATURDAY NIGHT...West winds 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .SUNDAY...Southwest winds 15 to 20 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .MONDAY...Southwest winds 15 to 20 knots diminishing to 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 foot or less. .TUESDAY...West winds 10 knots or less becoming northeast. Waves 1 foot or less. $$ LOZ061-160300- MAFOR 1521/ ONTARIO WEST 1/2 12220 11226 11326 11420 11536 11640 11630. Waves 2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to4 feet tonight. Waves 2 to 4 feet building to 6 to 9 feet, and occasionally around 11 feet Friday. ONTARIO EAST 1/2 12210 11326 11336 11446 11436 11536 11630. Waves 1 to 3 feet building to 4 to 7 feet, and occasionally around 9 feet tonight. Waves 5 to 8 feet building to 6 to 9 feet, and occasionally around 11 feet Friday. $$