FZUS61 KBUF 252003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Wed Mar 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 29.7 inch low over the central Great Lakes tonight will pass north of the lake on Thursday, then to the Gulf of Saint Lawrence by early Friday, with a trailing cold front crossing the lake Thursday evening. A large 30.7 inch high will then build across the Great Lakes region Friday through Sunday. LOZ062-260300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Wed Mar 25 2026 .TONIGHT...East winds 5 to 15 knots becoming southwest 15 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet. .THURSDAY...Southwest winds 15 to 20 knots becoming northwest 10 to 15 knots. A chance of showers early in the afternoon. Showers likely late. Waves 2 to 4 feet subsiding to 1 to 3 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots becoming north 15 to 20 knots. Rain showers in the evening, then rain showers likely with a chance of snow showers overnight. Waves 1 to 3 feet building to 2 to 4 feet. .FRIDAY...North winds 15 to 20 knots diminishing to 10 to 15 knots. A chance of snow showers in the morning. Waves 3 to 5 feet subsiding to 2 to 3 feet. .FRIDAY NIGHT...Northwest winds 10 to 15 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. Waves 1 to 2 feet building to 3 to 5 feet. .SUNDAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .MONDAY...Southwest winds 15 to 25 knots becoming north. Waves 3 to 6 feet subsiding to 2 to 4 feet. $$ LOZ063-064-260300- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 403 PM EDT Wed Mar 25 2026 .TONIGHT...East winds 10 to 15 knots becoming southwest 15 to 20 knots. A chance of rain showers late. Waves 1 to 3 feet building to 3 to 5 feet. .THURSDAY...Southwest winds 15 to 20 knots becoming northwest 10 to 15 knots. A chance of rain showers early in the afternoon. Rain showers likely late. Waves 3 to 5 feet subsiding to 2 to 4 feet. .THURSDAY NIGHT...North winds 10 to 15 knots increasing to 15 to 25 knots. Rain showers in the evening, then rain showers with a chance of snow showers overnight. Waves 2 to 3 feet building to 3 to 5 feet. .FRIDAY...North winds 15 to 25 knots. A chance of snow showers in the morning. Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves occasionally around 9 feet. .FRIDAY NIGHT...North winds 10 to 15 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. Waves 1 to 2 feet building to 3 to 6 feet. .SUNDAY...West winds 15 to 20 knots becoming south. Waves 3 to 5 feet. .MONDAY...Southwest winds 15 to 20 knots becoming north. Waves 3 to 6 feet. $$ LOZ065-260300- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 403 PM EDT Wed Mar 25 2026 .TONIGHT...East winds 10 to 15 knots becoming south 15 to 20 knots. A chance of rain showers early. A chance of rain showers late. Waves 1 foot or less building to 3 to 5 feet. .THURSDAY...South winds 15 to 20 knots becoming southwest 10 to 15 knots. A chance of rain showers early in the afternoon. Rain showers likely late. Waves 3 to 5 feet subsiding to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds around 10 knots becoming north and increasing to 15 to 20 knots. Rain showers in the evening, then rain showers likely with a chance of snow showers overnight. Waves 1 to 3 feet building to 2 to 4 feet. .FRIDAY...North winds 15 to 25 knots. A chance of snow showers in the morning. Waves 3 to 5 feet subsiding to 1 to 3 feet. .FRIDAY NIGHT...North winds 10 to 15 knots. Waves 1 to 3 feet. .SATURDAY...Northwest winds 5 to 15 knots becoming west 15 to 20 knots. Waves 1 foot or less building to 3 to 5 feet. .SUNDAY...West winds 10 to 15 knots becoming south 15 to 20 knots. Waves 3 to 5 feet. .MONDAY...South winds 15 to 20 knots becoming north. Waves 3 to 6 feet subsiding to 2 to 4 feet. $$ LOZ061-260300- MAFOR 2521/ ONTARIO WEST 1/2 11200 11300 11420 12520 11510 11610 11716. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Thursday. ONTARIO EAST 1/2 11210 11320 12420 11520 11510 12610. A chance of rain showers Thursday afternoon. Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Thursday. $$