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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1012 pm edt thu apr 2 2026


slz022-024-030900-
saint lawrence river from cape vincent to saint regis
1012 pm edt thu apr 2 2026

.rest of tonight...east winds 5 to 15 knots becoming south 15 to
20 knots. rain showers likely late this evening, then rain
showers after midnight. 
.friday...south winds 15 to 20 knots becoming southwest. showers
early, then showers likely late in the morning. a chance of
showers early in the afternoon. 
.friday night...west winds 15 to 20 knots becoming north and
diminishing to less than 10 knots overnight. partly to mostly
cloudy. 
.saturday...northeast winds 5 to 10 knots. rain showers likely in
the afternoon. 
.saturday night...east winds 5 to 15 knots becoming south 15 to
20 knots. showers.
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. rain showers during the day, then a chance of snow
showers sunday night. 
.monday...west winds 5 to 10 knots becoming northwest. a chance
of snow showers during the day. 
.tuesday...north winds 10 knots or less becoming northwest.
mostly cloudy, then clearing. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1011 pm edt thu apr 2 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 across the upper great lakes 
tonight and to southern quebec friday afternoon, while lifting a 
warm front northward across the lake tonight, followed by a weak 
trailing cold front friday afternoon. a 29.4 inch surface low will 
track through the central great lakes saturday, then into quebec 
saturday night and sunday, while dragging a strong cold front across 
the lake saturday night, with a secondary cold front then following 
sunday night and monday. a 30.5 inch high will then build across the 
great lakes tuesday and tuesday night, before sliding east and off 
the new england coast wednesday.


loz062-030900-
lake ontario open waters from the niagara river to hamlin beach-
1011 pm edt thu apr 2 2026

.rest of tonight...southeast winds 15 to 20 knots becoming south.
a chance of showers, then showers likely late. waves 3 to 6 feet.
.friday...southwest winds 15 to 25 knots becoming west. showers
likely early. waves 3 to 6 feet. 
.friday night...west winds 15 to 20 knots becoming northeast 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 15 knots increasing to 15 to
20 knots. a chance of rain showers in the morning, then rain
showers in the afternoon. waves 1 to 2 feet building to 3 to
5 feet. 
.saturday night...east winds 10 to 15 knots becoming southwest
15 to 20 knots. showers. waves 2 to 4 feet. 
.sunday...west winds 15 to 25 knots. rain showers during the day.
waves 5 to 8 feet. waves occasionally around 10 feet. 
.monday...west winds 15 to 20 knots becoming northwest. a chance
of snow showers monday night. waves 4 to 7 feet subsiding to 1 to
3 feet. waves occasionally around 9 feet. 
.tuesday...north winds 15 to 20 knots. a chance of snow showers
during the day. waves 3 to 5 feet subsiding to 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1011 pm edt thu apr 2 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 across the upper great lakes 
tonight and to southern quebec friday afternoon, while lifting a 
warm front northward across the lake tonight, followed by a weak 
trailing cold front friday afternoon. a 29.4 inch surface low will 
track through the central great lakes saturday, then into quebec 
saturday night and sunday, while dragging a strong cold front across 
the lake saturday night, with a secondary cold front then following 
sunday night and monday. a 30.5 inch high will then build across the 
great lakes tuesday and tuesday night, before sliding east and off 
the new england coast wednesday.


loz063>065-030900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1011 pm edt thu apr 2 2026

.rest of tonight...southeast winds to 30 knots becoming south. a
chance of showers late this evening, then showers likely with a
chance of thunderstorms after midnight. waves 3 to 6 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.friday...south winds to 30 knots becoming southwest and
diminishing to 15 to 20 knots. showers likely with a chance of
thunderstorms early, then a chance of showers late in the
morning. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 
.friday night...west winds 15 to 20 knots becoming north 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.saturday...northeast winds 10 to 15 knots becoming east. a
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 1 to 3 feet. 
.saturday night...southeast winds 15 to 20 knots becoming
southwest and increasing to 30 knots. showers with a chance of
thunderstorms in the evening, then showers overnight. waves 1 to
3 feet building to 3 to 6 feet. 
.sunday...west winds 15 to 20 knots increasing to 30 knots. rain
showers during the day, then a chance of snow showers sunday
night. waves 5 to 8 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.monday...west winds 15 to 25 knots becoming northwest 15 to
20 knots. a chance of snow showers. waves 6 to 9 feet subsiding
to 2 to 4 feet. waves occasionally around 11 feet. 
.tuesday...north winds 15 to 20 knots. a chance of snow showers
during the day. waves 3 to 5 feet subsiding to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$