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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt mon aug 24 2026


slz022-024-250900-
saint lawrence river from cape vincent to saint regis
1003 pm edt mon aug 24 2026

.rest of tonight...southwest winds 5 to 10 knots. showers likely
late this evening, then a chance of showers after midnight. 
.tuesday...west winds 10 knots or less. a chance of showers in
the afternoon. 
.tuesday night...west winds less than 10 knots. partly to mostly
cloudy. 
.wednesday...light and variable winds becoming southwest 5 to
10 knots. mostly sunny. 
.wednesday night...south winds 10 knots or less. partly cloudy. 
.thursday...south winds 5 to 15 knots becoming southwest less
than 10 knots. showers likely with a chance of thunderstorms. 
.friday...west winds 10 knots or less becoming northwest. a
chance of showers during the day. 
.saturday...light and variable winds. 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
1002 pm edt mon aug 24 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 ridge averaging 30.1 inches will build from the 
western and central great lakes tuesday through wednesday. the ridge 
will exit eastward thursday and allow a warm front to sweep 
northeastward across lake ontario. friday, a cold front should sweep 
eastward across the lake and be followed by a high pressure ridge 
averaging 30.0 inches and building from the upper midwest.


loz062-250900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt mon aug 24 2026

.rest of tonight...west winds 15 to 20 knots. a chance of
waterspouts. a chance of showers. waves 2 to 4 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west 5 to
15 knots. waves 1 to 3 feet. 
.tuesday night...west winds 10 knots or less becoming southwest.
waves 2 feet or less. 
.wednesday...south winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday night...southeast winds 5 to 15 knots becoming south.
a chance of showers overnight. waves 2 feet or less. 
.thursday...southwest winds 5 to 15 knots becoming northwest.
showers likely with a chance of thunderstorms during the day,
then a chance of showers and thunderstorms thursday night. waves
1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 
.saturday...north winds 10 knots or less becoming south. 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
1002 pm edt mon aug 24 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 ridge averaging 30.1 inches will build from the 
western and central great lakes tuesday through wednesday. the ridge 
will exit eastward thursday and allow a warm front to sweep 
northeastward across lake ontario. friday, a cold front should sweep 
eastward across the lake and be followed by a high pressure ridge 
averaging 30.0 inches and building from the upper midwest.


loz063>065-250900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon aug 24 2026

.rest of tonight...west winds 15 to 20 knots. a chance of
waterspouts. showers with a chance of thunderstorms late this
evening, then showers likely after midnight. waves 3 to 6 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of waterspouts early. a chance of showers in
the morning. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 
.wednesday...southwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday night...southeast winds 5 to 15 knots becoming south
15 to 20 knots. waves 1 foot or less building to 1 to 3 feet. 
.thursday...south winds 15 to 20 knots becoming west 5 to
15 knots. showers likely with a chance of thunderstorms. waves
1 to 3 feet subsiding to 1 foot or less. 
.friday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 
.saturday...north winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$