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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt mon oct 12 2026


slz022-024-122100-
saint lawrence river from cape vincent to saint regis
1003 am edt mon oct 12 2026

.this afternoon...west winds less than 10 knots. patchy drizzle,
then 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
1002 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 ridge averaging 29.9 inches will slide eastward across 
the lower great lakes today before exiting eastward tonight. a cold 
front will sweep southeast 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.


loz062-122100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt mon oct 12 2026

.this afternoon...west winds 5 to 10 knots becoming southwest.
waves 1 to 2 feet. 
.tonight...southwest winds 5 to 15 knots. a chance of showers and
thunderstorms late. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers likely with a chance of thunderstorms. waves
1 to 3 feet building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. showers likely with a chance of
thunderstorms in the evening, then a chance of showers overnight.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming north. waves
2 feet or less. 
.thursday...northeast winds 10 to 15 knots becoming east. showers
thursday night. waves 1 to 3 feet. 
.friday...northwest winds 15 to 20 knots increasing to 30 knots.
showers. waves 1 to 3 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 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 ridge averaging 29.9 inches will slide eastward across 
the lower great lakes today before exiting eastward tonight. a cold 
front will sweep southeast 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>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt mon oct 12 2026

.this afternoon...west winds 5 to 10 knots. patchy drizzle. 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.

$$