FZUS61 KBUF 212003 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 PM EDT Sat Mar 21 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 build across the lake today. A 29.6 inch low will then cross the lower Great Lakes Sunday before sliding off the mid-Atlantic coast Monday. A 30.4 inch high is forecast to build across the upper Great Lakes Monday, then move to the lower Great Lakes Tuesday while strengthening to 30.5 inches. A 29.8 inch low tracking across Quebec will then push its associated cold front across the lake on Wednesday. LOZ062-220300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 PM EDT Sat Mar 21 2026 .TONIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain showers after midnight. Waves 2 feet or less building to 3 to 5 feet. .SUNDAY...Northeast winds 10 to 15 knots. A chance of rain showers early, then rain showers likely. A chance of rain and snow showers late. Waves 2 to 4 feet subsiding to 1 to 2 feet. .SUNDAY NIGHT...Northeast winds 10 to 15 knots. Waves 1 to 3 feet. .MONDAY...North winds 10 to 15 knots becoming northwest. Waves 1 to 3 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves 1 to 2 feet. .TUESDAY...West winds 5 to 15 knots increasing to 15 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...West winds 15 to 20 knots becoming east. A chance of rain and snow showers Wednesday night. Waves 3 to 5 feet subsiding to 2 to 4 feet. .THURSDAY...Southeast winds 15 to 25 knots becoming northwest. Rain showers likely with a chance of snow showers. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ063-064-220300- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 403 PM EDT Sat Mar 21 2026 .TONIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots. A chance of snow showers early, then a chance of rain and snow showers. Rain showers likely late. Waves 2 feet or less building to 3 to 5 feet. .SUNDAY...Northeast winds 15 to 20 knots becoming north 10 to 15 knots. A chance of rain showers early, then rain showers likely. A chance of snow and rain showers late. Waves 1 to 3 feet. .SUNDAY NIGHT...Northeast winds 15 to 20 knots. Waves 2 to 4 feet building to 3 to 5 feet. .MONDAY...North winds 15 to 20 knots becoming northwest 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves 1 to 2 feet. .TUESDAY...West winds 5 to 10 knots becoming southwest and increasing to 15 to 20 knots. Waves 1 to 2 feet building to 3 to 5 feet. .WEDNESDAY...West winds 15 to 20 knots becoming east. A chance of rain and snow showers. Waves 4 to 7 feet subsiding to 2 to 4 feet. Waves occasionally around 9 feet. .THURSDAY...Southeast winds 15 to 25 knots becoming northwest to 30 knots. Rain showers likely with a chance of snow showers during the day, then rain and snow showers likely Thursday night. Waves 3 to 5 feet building to 6 to 9 feet. Waves occasionally around 11 feet. $$ LOZ065-220300- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 403 PM EDT Sat Mar 21 2026 .TONIGHT...Southeast winds 5 to 15 knots becoming east 15 to 20 knots. A chance of snow showers this evening, then a chance of rain and snow showers after midnight. Rain and snow showers likely late. Waves 1 to 3 feet. .SUNDAY...Northeast winds 15 to 20 knots becoming north 10 to 15 knots. Rain showers likely in the morning, then a chance of rain showers early in the afternoon. A chance of snow showers late. Waves 2 feet or less. .SUNDAY NIGHT...Northeast winds 15 to 20 knots. Waves 1 to 3 feet. .MONDAY...North winds 15 to 20 knots becoming northwest 10 to 15 knots. Waves 1 to 3 feet. .MONDAY NIGHT...Northwest winds 5 to 10 knots becoming north. Waves 2 feet or less. .TUESDAY...Northwest winds 5 to 15 knots becoming southwest 15 to 20 knots. Waves 2 feet or less building to 3 to 5 feet. .WEDNESDAY...West winds 15 to 20 knots becoming east. A chance of rain and snow showers. Waves 3 to 6 feet subsiding to 1 to 3 feet. .THURSDAY...Southeast winds 15 to 25 knots becoming northwest. Rain and snow showers likely. Waves 2 to 4 feet building to 4 to 7 feet. Waves occasionally around 9 feet. $$ LOZ061-220300- MAFOR 2121/ ONTARIO WEST 1/2 11210 13220 11110 11806 11800 11100. A chance of snow showers Sunday afternoon. Waves 2 feet or less building to 3 to 5 feet tonight. Waves 2 to 4 feet subsiding to 1 to 2 feet Sunday. ONTARIO EAST 1/2 12210 12320 11220 11810 11800 11810. A chance of rain and snow showers overnight. A chance of rain showers Sunday morning, then a chance of rain and snow showers Sunday afternoon. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 1 to 3 feet Sunday. $$