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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt fri sep 4 2026


slz022-024-041500-
saint lawrence river from cape vincent to saint regis
403 am edt fri sep 4 2026

.today...light and variable winds becoming northwest 5 to
10 knots. patchy fog early. 
.tonight...northwest winds less than 10 knots becoming north.
partly cloudy. 
.saturday...north winds 10 knots or less becoming northeast.
partly sunny. 
.saturday night...northeast winds 10 knots or less. partly
cloudy. 
.sunday...northeast winds 5 to 10 knots becoming light and
variable. partly cloudy, then becoming clear. 
.monday...light and variable winds. mainly clear, then becoming
mostly cloudy. 
.tuesday...north winds 10 knots or less becoming southeast.
partly to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri sep 4 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 just south of the lake this morning will 
continue to sag further south away from the lake today. following 
the frontal passage, a 30.1 inch high will gradually settle 
southward from northern ontario today 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>065-041500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri sep 4 2026

.today...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.tonight...west winds 5 to 10 knots becoming northeast. waves
2 feet or less. 
.saturday...north winds 5 to 10 knots. waves 2 feet or less. 
.saturday night...north winds 5 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.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...northwest winds 10 knots or less. waves 1 foot or less.
.tuesday...northeast winds 5 to 15 knots becoming southeast.
waves 1 foot or less. 

$$