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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sat sep 5 2026


slz022-024-060900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sat sep 5 2026

.rest of tonight...northeast winds 5 to 10 knots. a chance of
showers late this evening. 
.sunday...northeast winds 5 to 10 knots becoming north. becoming
mostly sunny. 
.sunday night...north winds less than 10 knots. patchy fog
overnight. 
.monday...light and variable winds. patchy fog in the morning. 
.monday night...west winds less than 10 knots. partly to mostly
cloudy. 
.tuesday...light and variable winds becoming south 5 to 10 knots.
mostly cloudy. 
.wednesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers.
.thursday...west winds 5 to 15 knots becoming northwest. partly
to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat sep 5 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 30.1 inches will gradually 
build from the upper great lakes tonight, southeast across the lower 
great lakes region 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>065-060900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat sep 5 2026

.overnight...north winds 5 to 15 knots becoming northeast.
a chance of showers. waves 1 to 3 feet. 
.sunday...northeast winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.sunday night...north winds 10 knots or less becoming northwest.
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 to
30 knots. showers likely. 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. 

$$