FZUS61 KBUF 222003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Sun Mar 22 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 wavy cold frontal boundary averaging 29.6 inches will cross the lower Great Lakes today, before sliding off the mid- Atlantic coast tonight. A 30.4 inch high will then build across Lower Michigan Monday, and the mid-Atlantic states Tuesday. A 29.8 inch low tracking across Quebec will then push its associated cold front across the lake on Wednesday, with another 29.6 inch low then developing across the central Great Lakes and or the Ohio Valley Thursday. LOZ062-230300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Sun Mar 22 2026 .TONIGHT...North winds 10 to 15 knots becoming northeast. Waves 1 to 3 feet building to 2 to 4 feet. .MONDAY...North winds 10 to 15 knots becoming northwest. Waves 2 to 4 feet. .MONDAY NIGHT...Northwest winds 15 to 20 knots diminishing to 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TUESDAY...West winds 5 to 15 knots becoming southwest 15 to 20 knots. Waves 1 to 3 feet. .TUESDAY NIGHT...Southwest winds 10 to 15 knots. Waves 1 to 3 feet. .WEDNESDAY...Southwest winds 10 to 15 knots becoming east. A chance of rain and snow showers Wednesday night. Waves 1 to 3 feet. .THURSDAY...East winds 15 to 25 knots becoming northwest. A chance of rain and snow showers during the day, then a chance of rain showers Thursday night. Waves 2 to 4 feet building to 5 to 7 feet. Waves occasionally around 9 feet. .FRIDAY...Northwest winds 15 to 25 knots. Waves 4 to 7 feet subsiding to 3 to 5 feet. Waves occasionally around 9 feet. $$ LOZ063-064-230300- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 403 PM EDT Sun Mar 22 2026 .TONIGHT...North winds 15 to 20 knots becoming northeast. Waves 2 to 4 feet building to 3 to 5 feet. .MONDAY...North winds 15 to 20 knots becoming northwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .MONDAY NIGHT...Northwest winds 15 to 20 knots diminishing to 10 to 15 knots. Waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 5 to 15 knots becoming west. Waves 2 feet or less. .TUESDAY NIGHT...West winds 5 to 15 knots becoming southwest. Waves 1 to 2 feet. .WEDNESDAY...Southwest winds 10 to 15 knots becoming east. A chance of rain and snow showers Wednesday night. Waves 1 to 3 feet. .THURSDAY...East winds 15 to 25 knots becoming northwest. A chance of rain and snow showers during the day, then rain showers likely with a chance of snow showers Thursday night. Waves 2 to 4 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .FRIDAY...North winds 15 to 25 knots becoming northwest. A chance of rain and snow showers during the day. Waves 5 to 8 feet subsiding to 3 to 6 feet. Waves occasionally around 10 feet. $$ LOZ065-230300- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 403 PM EDT Sun Mar 22 2026 .TONIGHT...North winds 15 to 20 knots becoming northeast. Waves 1 to 3 feet building to 2 to 4 feet. .MONDAY...North winds 15 to 20 knots becoming northwest 10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .MONDAY NIGHT...Northwest winds 10 to 15 knots becoming north. Waves 2 feet or less. .TUESDAY...Northwest winds 10 knots or less becoming southwest 10 to 15 knots. Waves 2 feet or less. .TUESDAY NIGHT...Southwest winds 5 to 10 knots. Waves 2 feet or less. .WEDNESDAY...South winds 10 to 15 knots becoming northeast. A chance of rain and snow showers Wednesdaynight. Waves 1 to 3 feet. .THURSDAY...East winds 10 to 15 knots becoming northwest and increasing to 15 to 25 knots. A chance of rain and snow showers during the day, then rain and snow showers likely Thursday night. Waves 1 to 3 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .FRIDAY...North winds 15 to 25 knots. A chance of rain and snow showers during the day. Waves 3 to 6 feet subsiding to 1 to 3 feet. $$ LOZ061-230300- MAFOR 2221/ ONTARIO WEST 1/2 11810 12120 11110 13810 11710. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Monday. ONTARIO EAST 1/2 11820 13120 12820 11810 11710. Waves 2 feet or less building to 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Monday. $$