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


slz022-024-021500-
saint lawrence river from cape vincent to saint regis
411 am edt thu apr 2 2026

.today...northeast winds 5 to 15 knots. rain showers likely late.
.tonight...east winds 10 to 15 knots becoming south 15 to
20 knots. rain showers. 
.friday...south winds 15 to 20 knots becoming southwest. showers.
.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 15 knots becoming south. rain
showers likely during the day, then rain showers saturday night. 
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. rain showers during the day. 
.monday...northwest winds 5 to 15 knots. mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
410 am 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 30.7 inch high will build east across quebec today. a 
29.6 inch low will move into the central great lakes to before 
reaching southern quebec friday afternoon, lifting a frontal 
boundary northward over the lake tonight. a 29.4 inch surface low 
will track through the central great lakes saturday, then into 
quebec saturday night and sunday, while dragging a cold front across 
the lake saturday night.


loz063>065-021500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
410 am edt thu apr 2 2026

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

winds and waves higher in and near thunderstorms.

$$