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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1008 am edt sat apr 4 2026


slz022-024-042100-
saint lawrence river from cape vincent to saint regis
1009 am edt sat apr 4 2026

.this afternoon...northeast winds 15 to 20 knots diminishing to
10 to 15 knots. rain showers likely late. 
.tonight...east winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. showers likely in the evening, then
showers with a chance of thunderstorms after midnight. 
.sunday...southwest winds 15 to 20 knots. showers.
.sunday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of rain and snow showers in the evening, then
a chance of snow showers overnight. 
.monday...west winds 5 to 10 knots becoming north. a chance of
snow and rain showers during the day, then a chance of snow
showers monday night. 
.tuesday...north winds 10 knots or less becoming southwest. a
chance of snow showers during the day. 
.wednesday...southwest winds 10 knots or less becoming south
10 to 15 knots. mainly clear, then becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1007 am edt sat apr 4 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 29.4 inch surface low will track through the central 
great lakes today, then into quebec tonight and sunday, while 
dragging a strong cold front across the lake early tonight, 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.


loz062-042100-
lake ontario open waters from the niagara river to hamlin beach-
1007 am edt sat apr 4 2026

.rest of today...east winds 15 to 25 knots. a chance of rain
showers late this morning, then rain showers likely early this
afternoon. a chance of rain showers late. waves 2 to 3 feet
building to 3 to 6 feet. 
.tonight...east winds 15 to 20 knots becoming southwest. a chance
of showers early, then showers with a chance of thunderstorms.
showers late. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.sunday...west winds 15 to 25 knots. a chance of rain showers in
the afternoon. waves 3 to 5 feet building to 5 to 7 feet. waves
occasionally around 9 feet. 
.sunday night...west winds 15 to 25 knots. a chance of rain
showers in the evening. waves 4 to 7 feet subsiding to 3 to
6 feet. waves occasionally around 9 feet. 
.monday...west winds 15 to 20 knots becoming northwest. a chance
of rain and snow showers during the day, then snow and rain
showers likely monday night. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west 5 to
15 knots. snow showers likely during the day. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.wednesday...south winds 5 to 10 knots increasing to 15 to
25 knots. waves 1 foot or less building to 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1007 am edt sat apr 4 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 29.4 inch surface low will track through the central 
great lakes today, then into quebec tonight and sunday, while 
dragging a strong cold front across the lake early tonight, 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>065-042100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1007 am edt sat apr 4 2026

.rest of today...northeast winds 15 to 20 knots becoming east. a
chance of rain showers this afternoon. waves 1 to 2 feet building
to 2 to 4 feet. 
.tonight...east winds 15 to 20 knots becoming southwest and
increasing to 30 knots. a chance of showers early, then showers
likely with a chance of thunderstorms late in the evening.
showers with a chance of thunderstorms after midnight. waves 2 to
4 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.sunday...west winds 15 to 25 knots increasing to 30 knots. rain
showers in the morning, then a chance of rain showers in the
afternoon. waves 3 to 6 feet building to 5 to 9 feet. waves
occasionally around 11 feet. 
.sunday night...west winds to 30 knots diminishing to 15 to
25 knots. a chance of rain showers in the evening. waves 6 to
10 feet. waves occasionally around 13 feet. 
.monday...west winds 15 to 20 knots becoming northwest. a chance
of rain and snow showers during the day, then snow and rain
showers likely monday night. waves 4 to 7 feet subsiding to 1 to
3 feet. waves occasionally around 9 feet. 
.tuesday...north winds 15 to 25 knots becoming northwest and
diminishing to 10 to 15 knots. snow showers likely during the
day. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday...south winds 5 to 10 knots increasing to 30 knots.
waves 2 feet or less building to 5 to 8 feet. waves occasionally
around 10 feet. 

winds and waves higher in and near thunderstorms.

$$