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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt tue sep 1 2026


slz022-024-020300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue sep 1 2026

.tonight...northeast winds 5 to 10 knots becoming light and
variable. patchy fog after midnight. 
.wednesday...southeast winds 10 knots or less becoming south.
patchy fog in the morning. a chance of showers and thunderstorms
early in the afternoon. showers likely with a chance of
thunderstorms late. 
.wednesday night...south winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms. 
.thursday...southwest winds 10 knots or less becoming west.
showers likely in the morning, then a chance of showers in the
afternoon. 
.thursday night...west winds less than 10 knots. a chance of
showers in the evening. 
.friday...northwest winds less than 10 knots. becoming mainly
clear. 
.saturday...north winds 10 knots or less becoming northeast.
partly cloudy. 
.sunday...northeast winds less than 10 knots. becoming mainly
clear. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue sep 1 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 frontal boundary will remain stalled near the lake 
through this evening before moving northeast across the lake as a 
warm front late tonight through wednesday morning. the front will 
then settle back south across the lake thursday. a 30.1 inch high 
over northwest ontario province friday will settle south into the 
lower great lakes saturday through sunday.


loz063>065-020300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt tue sep 1 2026

.tonight...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday...southeast winds 5 to 15 knots becoming south. a
chance of showers late in the morning. a chance of showers and
thunderstorms in the afternoon. waves 2 feet or less. 
.wednesday night...south winds 10 to 15 knots becoming southwest.
showers with a chance of thunderstorms. waves 1 to 3 feet. 
.thursday...west winds 10 to 15 knots. showers likely in the
morning, then a chance of showers in the afternoon. waves 1 to
2 feet. 
.thursday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 
.saturday...north winds 5 to 10 knots becoming northeast. waves
2 feet or less. 
.sunday...northeast winds 10 knots or less becoming southwest.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$