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


slz022-024-011500-
saint lawrence river from cape vincent to saint regis
411 am edt wed apr 1 2026

.today...northwest winds 10 knots or less becoming north. mostly
cloudy through early afternoon, then becoming partly sunny. 
.tonight...north winds 5 to 10 knots becoming northeast. mostly
cloudy. 
.thursday...northeast winds 5 to 15 knots. a chance of rain
showers in the morning, then rain showers likely in the
afternoon. 
.thursday night...east winds 5 to 15 knots becoming south 15 to
20 knots. rain showers. 
.friday...south winds 15 to 20 knots becoming northwest and
diminishing to 5 to 10 knots. showers during the day. 
.saturday...northeast winds 5 to 15 knots becoming south. a
chance of rain showers during the day, then rain showers saturday
night. 
.sunday...southwest winds 10 to 15 knots becoming west. rain
showers during the day, then a chance of rain showers sunday
night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am 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 29.9 inch area of low pressure near northern new 
england this morning will continue to drift eastward, with its 
associated frontal boundary stalling near the mason dixon line. a 
30.6 inch high will then build east across ontario and 
quebec today through thursday. a 29.6 inch low is then 
forecast to move into the central great lakes thursday night before 
reaching southern quebec late friday, lifting the frontal boundary 
to the south back northward over the lake thursday evening. a 29.4 
inch surface low will then track through the central great lakes 
saturday.


loz062-011500-
lake ontario open waters from the niagara river to hamlin beach-
409 am edt wed apr 1 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am 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 29.9 inch area of low pressure near northern new 
england this morning will continue to drift eastward, with its 
associated frontal boundary stalling near the mason dixon line. a 
30.6 inch high will then build east across ontario and 
quebec today through thursday. a 29.6 inch low is then 
forecast to move into the central great lakes thursday night before 
reaching southern quebec late friday, lifting the frontal boundary 
to the south back northward over the lake thursday evening. a 29.4 
inch surface low will then track through the central great lakes 
saturday.


loz063>065-011500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 am edt wed apr 1 2026

.today...northwest winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.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 in the morning, then rain showers likely
in the afternoon. waves 3 to 6 feet. 
.thursday night...southeast 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 to 30 knots becoming north and diminishing
to 5 to 10 knots. rain showers likely during the day, then a
chance of rain showers friday night. waves 4 to 7 feet subsiding
to 2 to 4 feet. waves occasionally around 9 feet. 
.saturday...northeast winds 5 to 15 knots becoming southwest and
increasing to 30 knots. a chance of rain showers during the day,
then rain showers with a chance of thunderstorms saturday night.
waves 1 to 3 feet building to 4 to 7 feet. waves occasionally
around 9 feet. 
.sunday...west winds to 30 knots. rain showers during the day,
then a chance of rain showers sunday night. waves 5 to 8 feet
building to 7 to 10 feet. waves occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$