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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1004 pm edt mon apr 20 2026


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1004 pm edt mon apr 20 2026

.overnight...southwest winds less than 10 knots becoming
south. mainly clear, then becoming partly cloudy. 
.tuesday...south winds 5 to 10 knots. partly sunny. 
.tuesday night...south winds 10 knots or less becoming southeast.
mostly cloudy. 
.wednesday...east winds less than 10 knots becoming north. partly
to mostly sunny. 
.wednesday night...north winds less than 10 knots. mainly clear
in the evening, then becoming partly cloudy. 
.thursday...north winds less than 10 knots becoming northeast.
partly to mostly cloudy. 
.friday...northeast winds less than 10 knots becoming east.
partly cloudy. 
.saturday...east winds 10 knots or less becoming northeast. a
chance of rain showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt mon apr 20 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 30.4 inch high will settle southeast across the great 
lakes tonight, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing a cold front across the lake 
tuesday night. a 30.2 inch high will then build across the great 
lakes region wednesday and thursday. a warm front will approach the 
lake by friday. a 29.6 inch low may move southwest of the lake on 
saturday.


loz062-210900-
lake ontario open waters from the niagara river to hamlin beach-
1003 pm edt mon apr 20 2026

.overnight...southwest winds 10 knots or less becoming
south. waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots. waves 1 to 2 feet. 
.tuesday night...southeast winds 5 to 10 knots becoming
northeast. waves 2 feet or less. 
.wednesday...northeast winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.wednesday night...west winds less than 10 knots becoming north.
waves 1 foot or less. 
.thursday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet building to
2 to 4 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. a chance of showers. waves 2 to 4 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt mon apr 20 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 30.4 inch high will settle southeast across the great 
lakes tonight, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing a cold front across the lake 
tuesday night. a 30.2 inch high will then build across the great 
lakes region wednesday and thursday. a warm front will approach the 
lake by friday. a 29.6 inch low may move southwest of the lake on 
saturday.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt mon apr 20 2026

.overnight...west winds 5 to 15 knots becoming southwest.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southeast. waves
1 to 2 feet. 
.tuesday night...southeast winds 10 to 15 knots. waves 1 to
3 feet. 
.wednesday...east winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday night...west winds less than 10 knots becoming north.
waves 1 foot or less. 
.thursday...north winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots becoming east. a chance
of showers friday night. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 

$$