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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt mon oct 19 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...30.4 inch high pressure will maintain influence over the 
lower great lakes this week. the high may briefly weaken to 30.2 
inches wednesday and thursday.


loz063>065-200900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt mon oct 19 2026

.overnight...northwest winds 5 to 10 knots becoming
northeast and increasing to 15 to 20 knots. waves 1 foot or less
building to 1 to 3 feet. 
.tuesday...northeast winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday night...northeast winds 5 to 15 knots. waves 1 to
3 feet. 
.wednesday...northeast winds 10 knots or less. waves 2 feet or
less. 
.wednesday night...north winds 10 knots or less becoming
northwest. waves 1 foot or less. 
.thursday...northwest winds 5 to 15 knots becoming northeast
15 to 20 knots. waves 2 feet or less building to 2 to 4 feet. 
.friday...northeast winds 15 to 20 knots becoming southeast and
diminishing to 5 to 10 knots. waves 2 to 4 feet subsiding to
2 feet or less. 
.saturday...south winds 10 knots or less. waves 2 feet or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt mon oct 19 2026


slz022-024-200900-
saint lawrence river from cape vincent to saint regis
1003 pm edt mon oct 19 2026

.overnight...light and variable winds becoming north 5 to
10 knots. mainly clear, then becoming partly cloudy. 
.tuesday...north winds 5 to 10 knots. sunny.
.tuesday night...north winds less than 10 knots becoming
northeast. clear.
.wednesday...northeast winds less than 10 knots. sunny.
.wednesday night...light and variable winds. mainly clear. 
.thursday...west winds 10 knots or less becoming north. becoming
mainly clear. 
.friday...north winds less than 10 knots. mainly clear. 
.saturday...light and variable winds. mainly clear. 

$$