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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu jul 2 2026


slz022-024-030300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu jul 2 2026

.tonight...southwest winds 10 knots or less. a chance of showers
and thunderstorms early. 
.friday...southwest winds 10 knots or less. a chance of showers
early in the afternoon. a chance of showers and thunderstorms
late. 
.friday night...southwest winds 10 knots or less becoming west. a
chance of showers and thunderstorms in the evening, then a chance
of showers overnight. 
.saturday...northwest winds less than 10 knots. a chance of
showers. 
.saturday night...northwest winds less than 10 knots. mainly
clear. 
.sunday...light and variable winds. partly to mostly cloudy. 
.monday...east winds less than 10 knots becoming southeast. a
chance of showers. 
.tuesday...southeast winds less than 10 knots. 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 thu jul 2 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 30.1 inch high will remain anchored near the mid and 
upper ohio valley and extend a ridge over lake ontario through 
friday. a weak cold front will drift southward across the lake 
saturday through saturday night. behind the front, a ridge should 
build over lake ontario as a 30.2 inch high moves from near james 
bay toward atlantic waters near the canadian maritimes through this 
tuesday.


loz062-030300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt thu jul 2 2026

.tonight...southwest winds 10 to 15 knots. a chance of showers
and thunderstorms early, then a chance of showers late this
evening. waves 1 to 3 feet. 
.friday...southwest winds 5 to 15 knots. a chance of showers late
in the morning. a chance of showers and thunderstorms early in
the afternoon, then showers likely with a chance of thunderstorms
late. waves 1 to 2 feet. 
.friday night...west winds 10 to 15 knots. showers likely with a
chance of thunderstorms. waves 1 to 2 feet. 
.saturday...northwest winds 10 knots or less becoming west.
showers likely in the morning, then a chance of showers in the
afternoon. waves 1 foot or less. 
.saturday night...west winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.sunday...east winds 5 to 10 knots. a chance of showers. waves
2 feet or less. 
.monday...east winds 5 to 15 knots. a chance of showers. waves
1 to 2 feet. 
.tuesday...east winds 10 knots or less becoming southwest. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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glflo 
expires:202607030300;;297355

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu jul 2 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 30.1 inch high will remain anchored near the mid and 
upper ohio valley and extend a ridge over lake ontario through 
friday. a weak cold front will drift southward across the lake 
saturday through saturday night. behind the front, a ridge should 
build over lake ontario as a 30.2 inch high moves from near james 
bay toward atlantic waters near the canadian maritimes through this 
tuesday.


loz063>065-030300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu jul 2 2026

.tonight...west winds 5 to 15 knots. a chance of showers and
thunderstorms this evening. waves 1 to 3 feet. 
.friday...west winds 5 to 15 knots. a chance of showers and
thunderstorms early. a chance of showers and thunderstorms in the
afternoon. waves 1 to 2 feet. 
.friday night...west winds 10 to 15 knots. showers likely with a
chance of thunderstorms. waves 1 to 2 feet. 
.saturday...northwest winds 5 to 10 knots becoming west. showers
likely in the morning, then a chance of showers in the afternoon.
waves 2 feet or less. 
.saturday night...west winds 10 knots or less becoming east.
waves 1 foot or less. 
.sunday...northeast winds 10 knots or less becoming east. a
chance of showers sunday night. waves 1 foot or less. 
.monday...east winds 5 to 10 knots becoming southeast. a chance
of showers. waves 1 foot or less. 
.tuesday...southeast winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$