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


slz022-024-011500-
saint lawrence river from cape vincent to saint regis
403 am edt tue sep 1 2026

.today...east winds 10 knots or less becoming northeast. showers
with a chance of thunderstorms early, then a chance of showers
late this morning. a chance of showers and thunderstorms this
afternoon. 
.tonight...northeast winds 5 to 10 knots becoming light and
variable. a chance of showers and thunderstorms early. 
.wednesday...southeast winds 10 knots or less becoming south. a
chance of showers and thunderstorms in the morning, then showers
with thunderstorms likely in the afternoon. 
.wednesday night...south winds 10 knots or less becoming
southwest. showers with thunderstorms likely. 
.thursday...southwest winds less than 10 knots. a chance of
showers during the day. 
.friday...northwest winds 10 knots or less. partly cloudy. 
.saturday...north winds 10 knots or less becoming northeast.
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 am 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.


loz062-011500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt tue sep 1 2026

.today...south winds 10 knots or less becoming north. showers
likely with a chance of thunderstorms early, then a chance of
showers late this morning. waves 1 foot or less. 
.tonight...light and variable winds becoming southeast 5 to
10 knots. patchy fog late. a chance of showers and thunderstorms
late. waves 1 foot or less. 
.wednesday...southeast winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms in the morning, then showers
with thunderstorms likely in the afternoon. waves 1 foot or less.
.wednesday night...southwest winds 5 to 10 knots becoming west.
showers with thunderstorms likely. waves 1 foot or less. 
.thursday...west winds 5 to 10 knots becoming northwest. showers
with a chance of thunderstorms during the day. waves 1 foot or
less. 
.friday...northwest winds 10 knots or less becoming north. waves
1 foot or less. 
.saturday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 

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 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>065-011500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue sep 1 2026

.today...southeast winds 5 to 15 knots becoming northeast less
than 10 knots. showers with a chance of thunderstorms this
morning. waves 2 feet or less. 
.tonight...light and variable winds becoming south 5 to 10 knots.
patchy fog after midnight. waves 1 foot or less. 
.wednesday...southeast winds 5 to 15 knots becoming south. a
chance of showers and thunderstorms in the morning, then showers
with thunderstorms likely in the afternoon. waves 2 feet or less.
.wednesday night...south winds 10 to 15 knots becoming southwest.
showers with thunderstorms likely. waves 2 feet or less. 
.thursday...west winds 5 to 10 knots becoming northwest. showers
likely during the day. 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. 

winds and waves higher in and near thunderstorms.

$$