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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt mon aug 17 2026


slz022-024-172100-
saint lawrence river from cape vincent to saint regis
1002 am edt mon aug 17 2026

.this afternoon...west winds 5 to 10 knots becoming northwest. a
chance of showers early. 
.tonight...north winds 5 to 10 knots becoming light and variable.
patchy fog from late evening on. 
.tuesday...light and variable winds becoming west 5 to 10 knots.
patchy fog in the morning. 
.tuesday night...southwest winds 10 knots or less becoming south.
a chance of showers overnight. 
.wednesday...southwest winds 10 knots or less becoming west.
showers with a chance of thunderstorms during the day, then
showers wednesday night. 
.thursday...light and variable winds. becoming mainly clear. 
.friday...light and variable winds. 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
1002 am edt mon aug 17 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 trough averaging 29.8 inches will linger over lake ontario today. 
a high pressure ridge averaging 30.0 inches builds from the upper 
midwest tonight and traverses lake ontario on tuesday. the ridge 
will begin to exit eastward tuesday night before a cold front sweeps 
southeastward across the lake wednesday. behind the cold front, a 
30.1 inch high will build from the upper midwest through this friday.


loz063>065-172100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt mon aug 17 2026

.this afternoon...west winds 5 to 15 knots. a chance of showers.
waves 2 feet or less. 
.tonight...northwest winds 5 to 15 knots becoming north less than
10 knots. waves 2 feet or less. 
.tuesday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...west winds 5 to 15 knots becoming southwest. a
chance of showers overnight. waves 2 feet or less. 
.wednesday...southwest winds 5 to 15 knots becoming northwest.
showers likely during the day, then a chance of showers wednesday
night. waves 1 to 3 feet. 
.thursday...northwest winds 10 knots or less. waves 1 foot or
less. 
.friday...southwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 

$$