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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt sun sep 6 2026


slz022-024-061500-
saint lawrence river from cape vincent to saint regis
403 am edt sun sep 6 2026

.today...northeast winds 5 to 10 knots becoming north. becoming
mostly sunny. 
.tonight...northwest winds less than 10 knots. patchy fog after
midnight. 
.monday...light and variable winds. patchy fog in the morning. 
.monday night...west winds less than 10 knots. partly to mostly
cloudy. 
.tuesday...north winds 10 knots or less becoming southeast.
mostly cloudy. 
.wednesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers.
.thursday...southwest winds 5 to 15 knots becoming west. partly
to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun sep 6 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 large high pressure ridge averaging 30.2 inches will gradually 
build from the upper great lakes southeast across the lower lakes 
through tuesday. the ridge will shift southeast on wednesday, 
allowing a warm front to sweep northeastward across the lake, 
followed by a cold front crossing the lake later wednesday night 
into thursday.


loz062-061500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sun sep 6 2026

.today...northeast winds 5 to 15 knots becoming east. waves 1 to
3 feet. 
.tonight...east winds less than 10 knots. waves 1 foot or less. 
.monday...northwest winds less than 10 knots becoming west. waves
1 foot or less. 
.monday night...southwest winds less than 10 knots becoming west.
waves 1 foot or less. 
.tuesday...southwest winds 10 knots or less becoming south. waves
1 foot or less. 
.wednesday...southwest winds 15 to 25 knots becoming west 15 to
20 knots. showers likely with a chance of thunderstorms. waves
2 to 4 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.thursday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun sep 6 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 large high pressure ridge averaging 30.2 inches will gradually 
build from the upper great lakes southeast across the lower lakes 
through tuesday. the ridge will shift southeast on wednesday, 
allowing a warm front to sweep northeastward across the lake, 
followed by a cold front crossing the lake later wednesday night 
into thursday.


loz063>065-061500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun sep 6 2026

.today...northeast winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.tonight...north winds 10 knots or less. waves 2 feet or less. 
.monday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.monday night...west winds 5 to 10 knots. waves 1 foot or less. 
.tuesday...west winds 10 knots or less becoming south 10 to
15 knots. waves 2 feet or less. 
.wednesday...south winds 15 to 25 knots becoming west. showers
with a chance of thunderstorms. waves 2 to 4 feet building to
4 to 7 feet. waves occasionally around 9 feet. 
.thursday...west winds 15 to 25 knots becoming northwest. waves
5 to 8 feet subsiding to 3 to 5 feet. waves occasionally around
10 feet. 

winds and waves higher in and near thunderstorms.

$$