FZUS61 KBUF 250803 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 AM EDT Mon May 25 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 30.1 inch high will settle across the region through Tuesday. A cold front associated with a 29.8 inch low over New England will drop south across the lake on Wednesday morning. A 30.2 inch surface high pressure over Canada will start to expand south over the lake on Thursday into Friday. LOZ062-251500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 AM EDT Mon May 25 2026 .TODAY...West winds 5 to 10 knots becoming southwest. Patchy fog early. Waves 1 foot or less. .TONIGHT...Southwest winds 5 to 10 knots. Waves 1 foot or less. .TUESDAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Waves 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY...West winds 5 to 15 knots becoming north. Waves 2 feet or less. .THURSDAY...North winds 5 to 10 knots becoming northwest. Waves 2 feet or less. .FRIDAY...West winds 5 to 10 knots. Waves 1 to 2 feet. $$ LOZ063>065-251500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 AM EDT Mon May 25 2026 .TODAY...Southwest winds 5 to 15 knots becoming west. A chance of showers early. Areas of fog this morning. Waves 2 feet or less. .TONIGHT...West winds 5 to 15 knots becoming southwest. Waves 2 feet or less. .TUESDAY...Southwest winds 5 to 15 knots. Waves 2 feet or less. .TUESDAY NIGHT...Southwest winds 10 to 15 knots becoming west. Waves 1 to 3 feet. .WEDNESDAY...West winds 5 to 15 knots becoming north. Waves 1 to 3 feet. .THURSDAY...North winds 5 to 15 knots becoming west. Waves 2 feet or less. .FRIDAY...West winds 5 to 15 knots becoming northwest. Waves 1 to 3 feet. $$ LOZ061-251500- MAFOR 2509/ ONTARIO WEST 1/2 13600 14500 11500. A chance of showers early this morning. Waves 1 foot or less. ONTARIO EAST 1/2 11410 13600 11610 13500. A chance of showers this morning. Waves 2 feet or less. $$