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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 23 2026


slz022-024-240300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue jun 23 2026

.tonight...northwest winds less than 10 knots. mainly clear. 
.wednesday...west winds 10 knots or less. sunny.
.wednesday night...west winds 5 to 10 knots becoming light and
variable. partly to mostly cloudy. 
.thursday...southwest winds less than 10 knots becoming south. a
chance of showers in the afternoon. 
.thursday night...light and variable winds. showers with a chance
of thunderstorms. 
.friday...southwest winds less than 10 knots. showers with a
chance of thunderstorms during the day, then a chance of showers
and thunderstorms friday night. 
.saturday...light and variable winds. partly cloudy. 
.sunday...light and variable winds. mainly clear, then becoming
partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue jun 23 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 29.8 inch low will move off the southern new england 
coast through tonight. a 30.1 inch high will then build into the 
ohio valley tonight through wednesday, then drift to the eastern 
seaboard wednesday night through thursday. a weak 29.9 inch low is 
then forecast to move from the central great lakes thursday to 
southern quebec friday, then the canadian maritimes saturday. a 30.0 
inch high will then build across the lower great lakes this weekend.


loz062-240300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt tue jun 23 2026

.tonight...west winds 5 to 15 knots becoming northwest. waves
1 to 2 feet. 
.wednesday...west winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.wednesday night...southwest winds 10 knots or less becoming
south. a chance of showers overnight. waves 1 foot or less. 
.thursday...southeast winds 10 knots or less. showers likely in
the morning, then showers with a chance of thunderstorms in the
afternoon. waves 1 foot or less. 
.thursday night...southeast winds 10 knots or less becoming west.
showers with a chance of thunderstorms in the evening, then a
chance of showers overnight. waves 1 foot or less. 
.friday...west winds less than 10 knots becoming north. waves
1 foot or less. 
.saturday...northeast winds less than 10 knots becoming
northwest. waves 1 foot or less. 
.sunday...light and variable winds. waves 1 foot 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 pm edt tue jun 23 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 29.8 inch low will move off the southern new england 
coast through tonight. a 30.1 inch high will then build into the 
ohio valley tonight through wednesday, then drift to the eastern 
seaboard wednesday night through thursday. a weak 29.9 inch low is 
then forecast to move from the central great lakes thursday to 
southern quebec friday, then the canadian maritimes saturday. a 30.0 
inch high will then build across the lower great lakes this weekend.


loz063>065-240300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt tue jun 23 2026

.tonight...west winds 5 to 15 knots becoming northwest. waves
1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.wednesday night...west winds 5 to 15 knots becoming south less
than 10 knots. waves 2 feet or less. 
.thursday...south winds 5 to 10 knots becoming southeast. a
chance of showers in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 foot or less. 
.thursday night...southeast winds 5 to 10 knots becoming
southwest. showers with a chance of thunderstorms in the evening,
then showers overnight. waves 1 foot or less. 
.friday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.saturday...north winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.sunday...northwest winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$