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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon oct 12 2026


slz022-024-121500-
saint lawrence river from cape vincent to saint regis
403 am edt mon oct 12 2026

.today...southwest winds less than 10 knots becoming west. a
chance of showers late. 
.tonight...northwest winds less than 10 knots becoming east 10 to
15 knots. showers.
.tuesday...east winds 5 to 15 knots. showers with a chance of
thunderstorms. 
.tuesday night...northeast winds 5 to 10 knots becoming
northwest. showers in the evening, then showers likely overnight.
.wednesday...northwest winds 10 knots or less. mostly cloudy. 
.thursday...north winds 10 knots or less becoming east. showers
likely thursday night. 
.friday...southeast winds 5 to 15 knots becoming northwest 15 to
20 knots. rain showers. 

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 oct 12 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 weak ridge averaging 29.9 inches will slide eastward 
across the lake today before exiting eastward tonight. a cold front 
will sweep southeastward across the lake on tuesday. behind the cold 
front, a ridge averaging 30.2 inches builds from northern ontario 
through thursday. a 29.9 inch low may move across the great lakes 
region friday. this low has the potential to deepen into a stronger 
low.


loz063>065-121500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon oct 12 2026

.today...west winds 10 knots or less. waves 1 foot or less. 
.tonight...southwest winds 5 to 10 knots becoming south. a chance
of showers after midnight. showers likely late. waves 1 foot or
less. 
.tuesday...south winds 10 to 15 knots becoming southwest. showers
likely in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 2 feet or less. 
.tuesday night...southwest winds 10 to 15 knots becoming
northwest. showers with a chance of thunderstorms in the evening,
then a chance of showers overnight. waves 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming southeast.
showers thursday night. waves 1 to 3 feet. 
.friday...southwest winds 15 to 25 knots becoming northwest to
30 knots. showers. waves 2 to 4 feet building to 8 to 11 feet.
waves occasionally around 14 feet. 

winds and waves higher in and near thunderstorms.

$$