FZUS61 KBUF 230803 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 AM EDT Sat May 23 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 large 30.4 inch high will strengthen to 30.6 inches as it anchors over Atlantic Canada through Sunday. A 29.9 inch low and attendant warm front will then approach the lower Great Lakes late tonight and Saturday, before weakening and sliding eastward Sunday. A 30.1 inch high will settle across the region Monday through Tuesday. A cold front associated with a 29.8 inch low over New England will drop south across the lake on Wednesday. High pressure over Canada will start to expand south over the lake on Thursday. LOZ062-231500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 AM EDT Sat May 23 2026 .TODAY...East winds 10 to 15 knots increasing to 15 to 25 knots. A chance of rain early, then rain from late morning on. Waves 3 to 5 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .TONIGHT...East winds 15 to 25 knots. Showers. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet. .SUNDAY...East winds 15 to 20 knots diminishing to 5 to 15 knots. Showers in the morning, then a chance of showers in the afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet. .SUNDAY NIGHT...East winds less than 10 knots. A chance of showers. Waves 1 foot or less. .MONDAY...Light and variable winds. A chance of showers during the day. Waves 1 foot or less. .TUESDAY...Southwest winds 10 knots or less becoming west. Waves 1 foot or less. .WEDNESDAY...West winds 10 knots or less becoming north. Waves 1 foot or less. $$ LOZ063>065-231500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 AM EDT Sat May 23 2026 .TODAY...Southeast winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain late this morning. Rain this afternoon. Waves 1 to 3 feet building to 3 to 5 feet. .TONIGHT...Southeast winds 15 to 25 knots. Showers. Waves 3 to 6 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .SUNDAY...Southeast winds 15 to 25 knots. Showers. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY NIGHT...Southeast winds 15 to 20 knots becoming south 10 to 15 knots. A chance of showers overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet. .MONDAY...Southwest winds 10 knots or less. A chance of showers during the day. Waves 1 foot or less. .TUESDAY...Southwest winds 5 to 10 knots becoming west. Waves 1 foot or less. .WEDNESDAY...West winds 5 to 10 knots becoming north. Waves 1 foot or less. $$ LOZ061-231500- MAFOR 2309/ ONTARIO WEST 1/2 12210 11226 14236 11226. Waves 2 to 4 feet building to 4 to 7 feet, and occasionally around 9 feet today. Waves 5 to 8 feet subsiding to 3 to 6 feet, and occasionally around 10 feet tonight. ONTARIO EAST 1/2 13310 12326 13336. Waves 1 to 3 feet building to 2 to 4 feet today. Waves 3 to 6 feet tonight. $$