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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
411 am edt fri apr 3 2026


slz022-024-031500-
saint lawrence river from cape vincent to saint regis
411 am edt fri apr 3 2026

.today...south winds 15 to 20 knots becoming southwest. showers
this morning, then a chance of showers early this afternoon. 
.tonight...west winds 15 to 20 knots becoming northwest 5 to
15 knots. partly cloudy. 
.saturday...north winds 5 to 15 knots becoming east. rain showers
likely in the afternoon. 
.saturday night...east winds 10 to 15 knots becoming southwest
15 to 20 knots. showers.
.sunday...southwest winds 10 to 15 knots becoming west. rain
showers during the day, then a chance of snow showers sunday
night. 
.monday...west winds 5 to 15 knots becoming north. a chance of
snow showers during the day. 
.tuesday...north winds 10 knots or less becoming west. mostly
cloudy, then clearing. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
410 am edt fri apr 3 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 to southern quebec today, pushing a weak cold front across 
the lake this 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.


loz062-031500-
lake ontario open waters from the niagara river to hamlin beach-
410 am edt fri apr 3 2026

.today...south winds 15 to 25 knots becoming west. a chance of
showers early. waves 3 to 6 feet. 
.tonight...west winds 15 to 20 knots becoming north 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. rain showers likely 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 building to 3 to
5 feet. 
.sunday...west winds 15 to 25 knots. rain showers during the day.
waves 4 to 7 feet. waves occasionally around 9 feet. 
.monday...west winds 15 to 20 knots becoming northwest. a chance
of rain and snow showers monday night. waves 3 to 6 feet
subsiding to 1 to 3 feet. 
.tuesday...north winds 15 to 20 knots becoming northwest 10 to
15 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
410 am edt fri apr 3 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 to southern quebec today, pushing a weak cold front across 
the lake this 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>065-031500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
410 am edt fri apr 3 2026

.today...south winds to 30 knots becoming southwest 15 to
25 knots. showers likely with a chance of thunderstorms early,
then showers likely late this morning. a chance of showers early
this afternoon. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 
.tonight...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 5 to 15 knots becoming east 15 to
20 knots. 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. 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 building to 6 to 9 feet. waves occasionally
around 11 feet. 
.monday...west winds 15 to 25 knots becoming northwest 15 to
20 knots. a chance of snow showers monday night. waves 5 to
8 feet subsiding to 2 to 4 feet. waves occasionally around
10 feet. 
.tuesday...north winds 15 to 20 knots becoming northwest. 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.

$$