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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu sep 3 2026


slz022-024-040300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu sep 3 2026

.tonight...west winds 5 to 10 knots becoming light and variable.
patchy fog after midnight. 
.friday...light and variable winds becoming northwest 5 to
10 knots. patchy fog early. 
.friday night...northwest winds less than 10 knots. partly
cloudy. 
.saturday...north winds 10 knots or less becoming northeast. a
chance of showers in the afternoon. 
.saturday night...northeast winds 5 to 10 knots. a chance of
showers in the evening. 
.sunday...northeast winds 5 to 10 knots becoming light and
variable. mainly clear. 
.monday...light and variable winds. mainly clear, then becoming
partly cloudy. 
.tuesday...north winds less than 10 knots becoming southeast. a
chance of showers tuesday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu sep 3 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 secondary cold front near lake ontario will slowly push southward 
tonight. following the frontal passage, a 30.1 inch high will 
gradually settle southward from northern ontario friday through 
monday. another cold front will then cross the lake monday night, 
with another 30.1 inch high then forecast to build south from near 
james bay on tuesday.


loz063>065-040300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu sep 3 2026

.tonight...southwest winds 10 knots or less becoming northwest.
waves 2 feet or less. 
.friday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.friday night...west winds 5 to 10 knots becoming north. waves
2 feet or less. 
.saturday...north winds 5 to 10 knots. waves 2 feet or less. 
.saturday night...north winds 10 to 15 knots becoming northeast.
waves 2 feet or less. 
.sunday...northeast winds 5 to 15 knots diminishing to less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.monday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.tuesday...northwest winds 5 to 15 knots becoming southeast.
waves 1 foot or less. 

$$