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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
411 pm edt mon apr 13 2026


slz022-024-140300-
saint lawrence river from cape vincent to saint regis
411 pm edt mon apr 13 2026

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

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
410 pm edt mon apr 13 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 29.6 inch low will move into the central great lakes 
tuesday morning before weakening across the saint lawrence valley 
tuesday night. another 29.6 inch low will move into the central 
great lakes wednesday night before reaching southern quebec thursday 
night. a 30.0 inch high is then forecast to build from the central 
great lakes friday to the lower great lakes saturday.


loz062-140300-
lake ontario open waters from the niagara river to hamlin beach-
410 pm edt mon apr 13 2026

.tonight...west winds 15 to 20 knots becoming east and
diminishing to 5 to 10 knots. waves 2 to 4 feet subsiding to
1 foot or less. 
.tuesday...southeast winds 10 to 15 knots becoming southwest
15 to 20 knots. showers with a chance of thunderstorms in the
morning, then a chance of showers and thunderstorms in the
afternoon. waves 1 to 2 feet building to 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. a chance of showers and thunderstorms in the
evening, then showers with a chance of thunderstorms overnight.
waves 3 to 5 feet subsiding to 1 to 2 feet. 
.wednesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers with a chance of thunderstorms in the morning,
then showers likely in the afternoon. waves 1 to 2 feet. 
.wednesday night...southwest winds 15 to 20 knots becoming south
and diminishing to 5 to 10 knots. showers. waves 1 to 2 feet. 
.thursday...south winds 10 to 15 knots becoming southwest.
showers. waves 1 to 3 feet. 
.friday...west winds 5 to 15 knots becoming east. a chance of
showers during the day. waves 1 to 3 feet subsiding to 1 foot or
less. 
.saturday...southeast winds 5 to 10 knots becoming southwest and
increasing to 15 to 25 knots. showers likely. waves 1 to 3 feet
building to 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
410 pm edt mon apr 13 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 29.6 inch low will move into the central great lakes 
tuesday morning before weakening across the saint lawrence valley 
tuesday night. another 29.6 inch low will move into the central 
great lakes wednesday night before reaching southern quebec thursday 
night. a 30.0 inch high is then forecast to build from the central 
great lakes friday to the lower great lakes saturday.


loz063>065-140300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
410 pm edt mon apr 13 2026

.tonight...west winds 15 to 25 knots becoming southeast and
diminishing to 5 to 10 knots after midnight. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.tuesday...southeast winds 5 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 building to
2 to 4 feet. 
.tuesday night...west winds 5 to 15 knots becoming southwest. a
chance of showers and thunderstorms in the evening, then showers
likely with a chance of thunderstorms overnight. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.wednesday...south winds 5 to 10 knots becoming west and
increasing to 15 to 20 knots. showers likely with a chance of
thunderstorms in the morning, then showers likely in the
afternoon. waves 1 to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south.
showers likely. waves 2 feet or less. 
.thursday...south winds 5 to 15 knots becoming west. showers
likely. waves 1 to 3 feet. 
.friday...northwest winds 5 to 15 knots becoming southeast. a
chance of showers during the day. waves 1 to 3 feet subsiding to
1 foot or less. 
.saturday...southeast winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. a chance of showers during the day,
then showers likely saturday night. waves 1 to 3 feet building to
4 to 7 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$