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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt tue aug 11 2026


slz022-024-120300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue aug 11 2026

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

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt tue aug 11 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 weak 29.9 inch high will settle across the lake through wednesday 
morning, before a trough averaging 29.7 inches moves over the lake 
wednesday afternoon where it will linger through thursday. a cold 
front then sweeps across the lake thursday night, with a 30.2 inch 
high pressure ridge building in from the upper great lakes on 
friday, settling over the lower great lakes region on saturday. a 
low averaging 29.8 inches is expected to approaching the lake 
sunday.


loz062-120300-
lake ontario open waters from the niagara river to hamlin beach-
403 pm edt tue aug 11 2026

.tonight...southwest winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday...northwest winds 10 knots or less becoming southwest.
a chance of showers and thunderstorms late. waves 1 foot or less.
.wednesday night...west winds 10 knots or less. a chance of
showers and thunderstorms in the evening. waves 1 foot or less. 
.thursday...west winds 5 to 10 knots. waves 1 foot or less. 
.thursday night...west winds 5 to 10 knots becoming north. waves
1 foot or less. 
.friday...north winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.saturday...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.sunday...south winds 5 to 10 knots becoming northwest. a chance
of showers and thunderstorms. waves 2 feet 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
403 pm edt tue aug 11 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 weak 29.9 inch high will settle across the lake through wednesday 
morning, before a trough averaging 29.7 inches moves over the lake 
wednesday afternoon where it will linger through thursday. a cold 
front then sweeps across the lake thursday night, with a 30.2 inch 
high pressure ridge building in from the upper great lakes on 
friday, settling over the lower great lakes region on saturday. a 
low averaging 29.8 inches is expected to approaching the lake 
sunday.


loz063>065-120300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt tue aug 11 2026

.tonight...west winds 10 knots or less. waves 2 feet or less. 
.wednesday...west winds 10 knots or less. waves 1 foot or less. 
.wednesday night...west winds 5 to 10 knots. a chance of showers
and thunderstorms in the evening. waves 1 foot or less. 
.thursday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.thursday night...west winds 5 to 15 knots becoming north. waves
1 to 2 feet. 
.friday...north winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.saturday...northeast winds 10 knots or less becoming south.
waves 1 foot or less. 
.sunday...south winds 5 to 10 knots becoming west. a chance of
showers and thunderstorms. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$