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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1011 am edt thu apr 2 2026


slz022-024-022100-
saint lawrence river from cape vincent to saint regis
1011 am edt thu apr 2 2026

.this afternoon...northeast winds 5 to 15 knots. a chance of rain
showers early. 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
1010 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 across the central great lakes tonight and 
to southern quebec friday afternoon, while lifting a warm front 
northward across 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, 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>065-022100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 am edt thu apr 2 2026

.rest of today...east winds 15 to 20 knots. rain showers likely
this afternoon. 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.

$$