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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed jun 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 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 
great lakes for saturday. a trough averaging 29.9 inches will cross 
the lake late sunday.


loz062-171500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt wed jun 17 2026

.today...south winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.tonight...south winds 10 to 15 knots becoming southeast and
increasing to 15 to 25 knots. showers likely late in the evening.
showers with a chance of thunderstorms after midnight. waves 1 to
3 feet building to 3 to 5 feet. 
.thursday...south winds 20 to 25 knots becoming west. showers
likely. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.thursday night...west winds 15 to 25 knots. a chance of showers
in the evening. waves 4 to 7 feet. waves occasionally around
9 feet. 
.friday...west winds 15 to 25 knots. waves 4 to 7 feet subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 
.saturday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 10 knots becoming north. a chance of
showers sunday night. 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
402 am edt wed jun 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 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 
great lakes for saturday. a trough averaging 29.9 inches will cross 
the lake late sunday.


loz063>065-171500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed jun 17 2026

.today...south winds 5 to 15 knots diminishing to less than
10 knots. a chance of showers early. a chance of showers this
afternoon. waves 2 feet or less. 
.tonight...southeast winds 5 to 10 knots increasing to 15 to
25 knots. a chance of showers late in the evening. showers with a
chance of thunderstorms after midnight. waves 2 feet or less
building to 3 to 5 feet. 
.thursday...south winds to 30 knots becoming southwest 15 to
25 knots. showers with a chance of thunderstorms in the morning,
then showers in the afternoon. 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. waves occasionally around
11 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 northwest less than
10 knots. a chance of showers sunday night. waves 1 to 3 feet
subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt wed jun 17 2026


slz022-024-171500-
saint lawrence river from cape vincent to saint regis
402 am edt wed jun 17 2026

.today...south winds 5 to 10 knots. a chance of showers late this
morning. showers likely with a chance of thunderstorms this
afternoon. 
.tonight...south winds 10 knots or less becoming southeast 10 to
15 knots. a chance of showers and thunderstorms early. a chance
of showers after midnight, then showers late. 
.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. 
.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. 
.sunday...west winds 5 to 10 knots becoming light and variable. a
chance of showers. 

winds and waves higher in and near thunderstorms.

$$