FZUS61 KBUF 272002 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 PM EDT Mon Oct 27 2025 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...An expansive 30.5 inch high will remain anchored over Quebec through Wednesday night before slowly weakening. A surface low will then approach the lake from the south Thursday strengthening to 29.4 inches, the low will then cross the lake Thursday night while continuing to strengthen. The low will then track northeast of the lake on Friday and to the Canadian Maritimes through Saturday, strengthening in the process to 28.6 inches. LOZ062-280300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 PM EDT Mon Oct 27 2025 .TONIGHT...East winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet. .TUESDAY...East winds 10 to 15 knots increasing to 15 to 25 knots. Waves 2 to 4 feet building to 3 to 6 feet. .TUESDAY NIGHT...East winds 15 to 20 knots. Waves 3 to 6 feet. .WEDNESDAY...East winds 15 to 20 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .WEDNESDAY NIGHT...East winds 15 to 20 knots. A chance of showers overnight. Waves 2 to 4 feet. .THURSDAY...East winds 15 to 25 knots becoming north to 30 knots. Showers. Waves 4 to 7 feet building to 7 to 11 feet. Waves occasionally around 14 feet. .FRIDAY...West gales to 35 knots. Showers. Waves 7 to 10 feet building to 9 to 13 feet, then subsiding to 8 to 11 feet. Waves occasionally around 16 feet. .SATURDAY...West winds to 30 knots diminishing to 15 to 20 knots. Showers likely. Waves 7 to 11 feet subsiding to 3 to 5 feet. Waves occasionally around 14 feet. $$ LOZ063>065-280300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 PM EDT Mon Oct 27 2025 .TONIGHT...Northeast winds 10 to 15 knots becoming east. Waves 1 to 3 feet. .TUESDAY...East winds 10 to 15 knots becoming northeast 15 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet. .TUESDAY NIGHT...Northeast winds 15 to 20 knots becoming east. Waves 3 to 5 feet. .WEDNESDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northeast winds 10 to 15 knots becoming east. A chance of showers overnight. Waves 1 to 3 feet. .THURSDAY...East winds 15 to 25 knots becoming northeast to 30 knots. Showers. Waves 3 to 6 feet building to 7 to 10 feet. Waves occasionally around 13 feet. .FRIDAY...Northwest winds to 30 knots becoming west and increasing to 35 knot gales. Showers. Waves 7 to 10 feet building to 10 to 15 feet. Waves occasionally around 19 feet. .SATURDAY...West winds to 30 knots diminishing to 15 to 20 knots. Showers. Waves 10 to 14 feet subsiding to 3 to 6 feet. Waves occasionally around 18 feet. $$ LOZ061-280300- MAFOR 2721/ ONTARIO WEST 1/2 11210 11220 14210 12220. Waves 2 to 4 feet tonight. Waves 2 to 4 feet building to 3 to 6 feet Tuesday. ONTARIO EAST 1/2 12110 14210 12110. Waves 1 to 3 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet Tuesday. $$