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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
409 pm edt wed apr 1 2026


slz022-024-020300-
saint lawrence river from cape vincent to saint regis
409 pm edt wed apr 1 2026

.tonight...north winds 5 to 10 knots becoming northeast. partly
to mostly cloudy. 
.thursday...northeast winds 5 to 10 knots. a chance of rain
showers early in the afternoon. rain showers late. 
.thursday night...east winds 5 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 10 knots becoming south and
increasing to 15 to 20 knots. 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
408 pm edt wed apr 1 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 tonight 
through thursday. a 29.6 inch low is then forecast to move into the 
central great lakes thursday night before reaching southern quebec 
friday afternoon, lifting the frontal boundary to the south back 
northward over the lake thursday evening. 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.


loz062-020300-
lake ontario open waters from the niagara river to hamlin beach-
408 pm edt wed apr 1 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
408 pm edt wed apr 1 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 tonight 
through thursday. a 29.6 inch low is then forecast to move into the 
central great lakes thursday night before reaching southern quebec 
friday afternoon, lifting the frontal boundary to the south back 
northward over the lake thursday evening. 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>065-020300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
408 pm edt wed apr 1 2026

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

$$