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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt wed jun 17 2026


slz022-024-180900-
saint lawrence river from cape vincent to saint regis
1003 pm edt wed jun 17 2026

...small craft advisory in effect from 8 am edt thursday through
thursday evening...

.overnight...south winds 10 knots or less becoming
southeast 10 to 15 knots. showers likely. showers
late. 
.thursday...southeast winds 15 to 25 knots becoming southwest.
showers with a chance of thunderstorms through early afternoon,
then a chance of showers and thunderstorms late. 
.thursday night...southwest winds 15 to 20 knots. a chance of
showers in the evening. 
.friday...southwest winds 15 to 20 knots becoming west. showers
with a chance of thunderstorms in the afternoon. 
.friday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. showers with a chance of thunderstorms in the evening,
then showers likely overnight. 
.saturday...west winds 10 knots or less. showers likely with a
chance of thunderstorms. 
.sunday...west winds less than 10 knots. a chance of showers. 
.monday...east winds less than 10 knots. 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
1002 pm 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 surface high just off the new england 
coastline this evening will continue to track farther out to sea 
tonight. a deepening surface low to 29.2 inches will then track 
north of the lake tonight, and then to southwestern quebec on 
thursday...all while dragging its associated cold front across the 
lake thursday morning. 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. on monday a broad area of high pressure 
averaging 30.2 inches will pass across the western great lakes, 
weakening and broadening further to 30.1 inches tuesday as it 
settles over the eastern great lakes.


loz062-180900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt wed jun 17 2026

.rest of tonight...south winds 5 to 10 knots increasing to 15 to
20 knots. showers likely late this evening, then showers with a
chance of thunderstorms after midnight. waves 1 to 2 feet
building to 3 to 6 feet. 
.thursday...southwest winds 15 to 25 knots becoming west. showers
with a chance of thunderstorms early, then a chance of showers.
waves 5 to 8 feet. waves occasionally around 10 feet. 
.thursday night...west winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.friday...west winds 15 to 25 knots. waves 3 to 6 feet. 
.friday night...west winds 15 to 20 knots. waves 3 to 6 feet. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 10 knots becoming northeast. a chance
of showers sunday night. waves 1 foot or less. 
.monday...northeast winds 5 to 15 knots becoming north. a chance
of showers during the day. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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 surface high just off the new england 
coastline this evening will continue to track farther out to sea 
tonight. a deepening surface low to 29.2 inches will then track 
north of the lake tonight, and then to southwestern quebec on 
thursday...all while dragging its associated cold front across the 
lake thursday morning. 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. on monday a broad area of high pressure 
averaging 30.2 inches will pass across the western great lakes, 
weakening and broadening further to 30.1 inches tuesday as it 
settles over the eastern great lakes.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt wed jun 17 2026

.rest of tonight...southeast winds 5 to 10 knots increasing to
15 to 25 knots. a chance of showers late this evening, then
showers with a chance of thunderstorms after midnight. waves
1 foot or less building to 3 to 6 feet. 
.thursday...south winds to 30 knots becoming west. showers with a
chance of thunderstorms in the morning, then a chance of showers
in the afternoon. waves 5 to 9 feet. waves occasionally around
11 feet. 
.thursday night...west winds to 30 knots. waves 5 to 9 feet.
waves occasionally around 11 feet. 
.friday...west winds 20 to 25 knots. waves 6 to 9 feet. waves
occasionally around 11 feet. 
.friday night...west winds 20 to 25 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 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.sunday...west winds 5 to 15 knots becoming northwest. a chance
of showers sunday night. waves 2 feet or less. 
.monday...east winds 5 to 10 knots becoming northwest. a chance
of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$