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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt tue jun 16 2026


slz022-024-170300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue jun 16 2026

.tonight...southwest winds 10 knots or less becoming south.
mainly clear this evening, then becoming partly cloudy. 
.wednesday...south winds 5 to 10 knots. a chance of showers in
the morning, then showers likely with a chance of thunderstorms
in the afternoon. 
.wednesday night...south winds 10 knots or less becoming
southeast. a chance of showers and thunderstorms in the evening,
then showers overnight. 
.thursday...southeast winds 15 to 20 knots becoming southwest.
showers with a chance of thunderstorms. 
.thursday night...southwest winds 15 to 20 knots. showers likely
in the evening, then a chance of showers overnight. 
.friday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. showers with a chance of thunderstorms. 
.saturday...west winds 5 to 15 knots diminishing to less than
10 knots. showers likely with a chance of thunderstorms. 
.sunday...west winds 5 to 10 knots becoming light and variable. a
chance of showers. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 162002
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue jun 16 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 29.9 inch high over the region will exit off to the 
east tonight. a 29.4 inch low will track north of the lake 
wednesday, with its front moving through late in the day. a 
deepening surface low will then track across the great lakes to 
southern quebec wednesday night and thursday, while pushing a cold 
front through the region. the low will then make its way to the 
canadian maritimes friday, while a 29.9 inch high builds across the 
upper great lakes.


loz063>065-170300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt tue jun 16 2026

.tonight...southeast winds 5 to 15 knots becoming south. a chance
of showers late. waves 2 feet or less. 
.wednesday...south winds 5 to 15 knots becoming southeast. a
chance of showers. waves 2 feet or less. 
.wednesday night...southeast winds 5 to 15 knots increasing to
15 to 25 knots. showers likely in the evening, then showers
overnight. waves 2 feet or less building to 3 to 5 feet. 
.thursday...south winds to 30 knots becoming southwest 15 to
25 knots. showers. waves 3 to 6 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 
.thursday night...west winds to 30 knots. a chance of showers in
the evening. waves 5 to 9 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.friday...west winds to 30 knots. waves 5 to 9 feet. waves
occasionally around 11 feet. 
.saturday...west winds 15 to 25 knots diminishing to 10 to
15 knots. waves 5 to 8 feet subsiding to 2 to 4 feet. waves
occasionally around 10 feet. 
.sunday...west winds 5 to 15 knots becoming southwest. waves 1 to
3 feet subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$