FZUS61 KBUF 270802 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 AM EDT Fri Mar 27 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 29.6 inch low will move east across Quebec tonight before reaching the Canadian Maritimes by Friday morning while deepening to 29.4 inches. A strong 30.6 inch high will build from the northern Plains Friday afternoon to the Ohio Valley Saturday afternoon and then off the Mid Atlantic coast Sunday. A 30.0 inch trough will sag southward across eastern Canada Monday, then move across the eastern Great Lakes Monday night. LOZ062-271500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 AM EDT Fri Mar 27 2026 .TODAY...North winds 15 to 20 knots becoming northwest 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. Waves 2 to 4 feet. .SATURDAY NIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 2 to 4 feet. .SUNDAY...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet. .MONDAY...Southwest winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots becoming southwest. Rain showers likely. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ063-064-271500- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 402 AM EDT Fri Mar 27 2026 .TODAY...North winds 15 to 25 knots diminishing to 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. .TONIGHT...Northwest winds 5 to 15 knots becoming north. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. A chance of snow showers. Waves 1 to 3 feet building to 3 to 6 feet. .SATURDAY NIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 6 feet subsiding to 2 to 4 feet. .SUNDAY...South winds 10 to 15 knots becoming southwest. Waves 1 to 3 feet. .MONDAY...Southwest winds 5 to 10 knots becoming northeast and increasing to 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots becoming south. Rain showers likely. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ065-271500- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 402 AM EDT Fri Mar 27 2026 .TODAY...North winds 15 to 25 knots diminishing to 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TONIGHT...North winds around 10 knots. Waves 2 feet or less. .SATURDAY...North winds 5 to 10 knots becoming west and increasing to 15 to 20 knots. Waves 1 foot or less building to 3 to 5 feet. .SATURDAY NIGHT...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 10 to 15 knots becoming southwest. Waves 1 to 3 feet. .MONDAY...Southwest winds 5 to 10 knots becoming northeast and increasing to 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...East winds 15 to 25 knots becoming south. Rain showers. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ061-271500- MAFOR 2709/ ONTARIO WEST 1/2 12820 11810 11800 11700 13710. Waves 3 to 6 feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight. ONTARIO EAST 1/2 12830 11820 11810 12700 12810. Waves 4 to 7 feet subsiding to 1 to 3 feet, and occasionally around 9 feet today. Waves 1 to 3 feet tonight. $$