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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt mon jul 6 2026


slz022-024-061500-
saint lawrence river from cape vincent to saint regis
402 am edt mon jul 6 2026

.today...northeast winds 10 knots or less becoming east. partly
sunny early, then becoming mostly cloudy. 
.tonight...east winds less than 10 knots. mostly cloudy through
the early overnight, then becoming partly cloudy. 
.tuesday...east winds less than 10 knots becoming northeast.
sunny.
.tuesday night...light and variable winds. mainly clear in the
evening, then becoming partly cloudy. 
.wednesday...southwest winds 10 knots or less. mainly clear, then
becoming partly cloudy. 
.thursday...southwest winds 10 knots or less. a chance of showers
and thunderstorms during the day, then showers likely with a
chance of thunderstorms thursday night. 
.friday...northwest winds less than 10 knots becoming north.
showers likely during the day, then a chance of showers friday
night. 

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 mon jul 6 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 30.2 inch high will build from quebec today southeast 
across new england tonight, then east of the canadian maritimes by 
tuesday. meanwhile, a weak 29.9 inch low over the ohio valley today 
will move to the mid atlantic tonight, then move off the southern 
new england coast tuesday. a broad 30.1 inch high is then forecast 
to build across the great lakes tuesday through wednesday, then 
drift off the east coast thursday. a weak cold front will cross the 
lake friday before another 30.1 inch high builds across the upper 
great lakes friday and the lower great lakes by saturday.


loz063>065-061500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon jul 6 2026

.today...east winds 10 to 15 knots. a chance of showers this
afternoon. waves 1 to 3 feet. 
.tonight...east winds 5 to 15 knots. a chance of showers early.
waves 1 to 3 feet. 
.tuesday...east winds 5 to 10 knots becoming northeast. waves
2 feet or less. 
.tuesday night...east winds 10 knots or less becoming south.
waves 1 foot or less. 
.wednesday...northwest winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.thursday...southwest winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms thursday night. waves
2 feet or less. 
.friday...west winds 5 to 10 knots becoming north. showers likely
with a chance of thunderstorms during the day, then a chance of
showers friday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$