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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt tue aug 25 2026


slz022-024-251500-
saint lawrence river from cape vincent to saint regis
402 am edt tue aug 25 2026

.today...west winds 10 knots or less. a chance of showers this
afternoon. 
.tonight...west winds less than 10 knots. a chance of showers
early. patchy fog from late evening on. 
.wednesday...light and variable winds. patchy fog in the morning.
.wednesday night...light and variable winds becoming south 5 to
10 knots. partly cloudy. 
.thursday...south winds 5 to 15 knots becoming southwest. showers
likely with a chance of thunderstorms. 
.friday...northwest winds less than 10 knots. mostly cloudy, then
clearing. 
.saturday...light and variable winds. mainly clear. 

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 tue aug 25 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 today 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>065-251500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue aug 25 2026

.today...northwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of waterspouts this morning. showers likely
early, then a chance of showers late this morning. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.tonight...west winds 10 knots or less. waves 2 feet or less. 
.wednesday...southwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday night...east winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...south winds 15 to 20 knots becoming west 5 to
15 knots. showers likely with a chance of thunderstorms. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 
.saturday...north winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$