FZUS61 KBUF 210803 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 403 AM 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. LOZ062-211500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 403 AM EDT Sat Mar 21 2026 .TODAY...Northwest winds 10 knots or less becoming east. Waves 1 foot or less. .TONIGHT...East winds 10 to 15 knots. A chance of rain and snow early, then a chance of rain from late evening on. Waves 1 to 2 feet building to 3 to 5 feet. .SUNDAY...Northeast winds 5 to 15 knots becoming north. Rain likely. Waves 1 to 3 feet. .SUNDAY NIGHT...Northeast winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain and snow showers in the evening, then a chance of snow showers overnight. Waves 2 to 4 feet. .MONDAY...North 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 increasing to 15 to 20 knots. Waves 1 to 3 feet building to 2 to 4 feet. .WEDNESDAY...Northwest winds 15 to 20 knots becoming east. Waves 3 to 5 feet subsiding to 2 to 4 feet. $$ LOZ063-064-211500- Lake Ontario open waters from Hamlin Beach to Mexico Bay- 403 AM EDT Sat Mar 21 2026 .TODAY...North winds 10 knots or less becoming northeast. Waves 1 foot or less. .TONIGHT...East winds 10 to 15 knots becoming southeast. A chance of rain and snow late in the evening. A chance of rain after midnight. Waves 1 to 3 feet building to 2 to 4 feet. .SUNDAY...East winds 10 to 15 knots becoming north. Rain likely. Waves 1 to 3 feet. .SUNDAY NIGHT...North winds 15 to 20 knots becoming northeast. A chance of rain and snow showers in the evening, then a chance of snow showers overnight. Waves 2 to 4 feet building to 3 to 5 feet. .MONDAY...North winds 15 to 20 knots diminishing to 5 to 15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 5 to 10 knots becoming west and increasing to 15 to 20 knots. A chance of rain and snow showers Tuesday night. Waves 2 feet or less building to 3 to 6 feet. .WEDNESDAY...Northwest winds 15 to 25 knots becoming east. A chance of rain and snow showers during the day. Waves 4 to 7 feet subsiding to 3 to 5 feet. Waves occasionally around 9 feet. $$ LOZ065-211500- Lake Ontario open waters from Mexico Bay to the Saint Lawrence River- 403 AM EDT Sat Mar 21 2026 .TODAY...North winds 10 knots or less becoming west. Waves 1 foot or less. .TONIGHT...Northeast winds 10 knots or less becoming southeast 10 to 15 knots. A chance of snow late in the evening. Rain and snow likely after midnight, then rain likely late. Waves 2 feet or less. .SUNDAY...Southeast winds 10 to 15 knots becoming north. Rain likely. Waves 2 feet or less. .SUNDAY NIGHT...North winds 10 to 15 knots becoming northeast 15 to 20 knots. A chance of snow and rain showers in the evening, then a chance of snow showers overnight. Waves 1 to 3 feet building to 2 to 4 feet. .MONDAY...North winds 15 to 20 knots diminishing to 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 foot or less. .TUESDAY...Northwest winds 5 to 10 knots becoming southwest and increasing to 15 to 20 knots. A chance of snow and rain showers Tuesday night. Waves 2 feet or less building to 3 to 6 feet. .WEDNESDAY...Northwest winds 15 to 20 knots becoming east. A chance of rain and snow showers during the day. Waves 3 to 6 feet subsiding to 1 to 3 feet. $$ LOZ061-211500- MAFOR 2109/ ONTARIO WEST 1/2 11800 11700 11100 11200 11210 13220. A chance of rain tonight. Waves 1 foot or less today. Waves 1 to 2 feet building to 3 to 5 feet tonight. ONTARIO EAST 1/2 13800 12100 11210 11220 11320. A chance of snow this evening, then a chance of rain overnight. Waves 2 feet or less today. Waves 1 foot or less building to 2 to 4 feet tonight. $$