FZUS61 KBUF 262009 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 409 PM EDT Thu Mar 26 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 trailing cold front will move south across the lake this evening. A strong 30.6 inch high will then 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. LOZ062-270300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 409 PM EDT Thu Mar 26 2026 .TONIGHT...North winds 5 to 15 knots increasing to 15 to 20 knots. Rain this evening, then a chance of rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet. .FRIDAY...North winds 15 to 20 knots diminishing to 5 to 15 knots. Waves 3 to 5 feet subsiding to 1 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. A chance of snow showers. Waves 1 to 3 feet building to 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 10 to 15 knots. Waves 1 to 3 feet. .MONDAY...Southwest winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of rain showers Monday night. Waves 2 to 3 feet. .TUESDAY...East winds 15 to 25 knots. A chance of rain showers during the day, then rain showers likely Tuesday night. Waves 3 to 6 feet building to 5 to 8 feet. Waves occasionally around 10 feet. $$ LOZ063-064-270300- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 409 PM EDT Thu Mar 26 2026 .TONIGHT...Northeast winds less than 10 knots becoming north and increasing to 15 to 25 knots after midnight. Rain this evening, then a chance of rain and snow showers after midnight. Waves 1 to 2 feet building to 3 to 6 feet. .FRIDAY...North winds 15 to 25 knots diminishing to 10 to 15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots becoming north. Waves 1 to 3 feet. .SATURDAY...Northwest winds 10 to 15 knots becoming west 15 to 20 knots. A chance of snow showers. Waves 1 to 3 feet building to 3 to 5 feet. .SATURDAY NIGHT...West winds 15 to 20 knots becoming southwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY...Southwest winds 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .MONDAY...Southwest winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet building to 2 to 4 feet. .TUESDAY...Northeast winds 15 to 25 knots becoming east. A chance of rain showers during the day, then rain showers likely Tuesday night. Waves 3 to 6 feet building to 5 to 8 feet. Waves occasionally around 10 feet. $$ LOZ065-270300- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 409 PM EDT Thu Mar 26 2026 .TONIGHT...Northeast winds 10 knots or less becoming north and increasing to 15 to 25 knots after midnight. Rain this evening, then a chance of rain and snow showers after midnight. Waves 1 to 3 feet building to 3 to 5 feet. .FRIDAY...North winds 15 to 25 knots diminishing to 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .FRIDAY NIGHT...North winds 10 to 15 knots. Waves 2 feet or less. .SATURDAY...North winds 5 to 15 knots becoming west 15 to 20 knots. Waves 2 feet or less building to 2 to 4 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 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .MONDAY...South winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of rain showers Monday night. Waves 1 to 3 feet. .TUESDAY...Northeast winds 15 to 25 knots becoming east. A chance of rain showers during the day, then rain showers likely Tuesday night. Waves 1 to 3 feet building to 3 to 5 feet. $$ LOZ061-270300- MAFOR 2621/ ONTARIO WEST 1/2 11106 11806 14820 11110 11100. Waves 1 to 2 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Friday. ONTARIO EAST 1/2 11106 11806 11820 12830 12820 11810. A chance of rain showers overnight. Waves 2 feet or less building to 3 to 6 feet tonight. Waves 3 to 6 feet subsiding to 1 to 3 feet Friday. $$