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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon apr 27 2026


slz022-024-271500-
saint lawrence river from cape vincent to saint regis
403 am edt mon apr 27 2026

.today...light and variable winds. sunny.
.tonight...east winds 10 knots or less becoming south. mainly
clear early, then becoming partly cloudy. 
.tuesday...south winds 5 to 15 knots. a chance of showers in the
afternoon. 
.tuesday night...south winds 5 to 15 knots becoming southwest. a
chance of showers. 
.wednesday...southwest winds 10 knots or less becoming west.
showers.
.thursday...northwest winds 5 to 10 knots. rain showers. 
.friday...northwest winds 5 to 15 knots becoming west. a chance
of rain showers during the day, then a chance of rain and snow
showers friday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon apr 27 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 30.3 inch high will build across the lower great lakes 
through monday. a 29.4 inch low over the great plains monday night 
will advance northeast into the upper great lakes later monday night 
into tuesday morning, while pushing a warm front across the lake. 
the low will head northeast to james bay tuesday night sending a 
cold front across the lake. an inverted trough averaging 29.7 inch 
inverted trough is expected across the lower great lakes wednesday 
through wednesday night. the trough/low will track to the coast of 
new england through friday while also deepening to 29.5 inches.


loz062-271500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt mon apr 27 2026

.today...east winds 10 knots or less increasing to 10 to
15 knots. waves 1 to 3 feet. 
.tonight...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 2 to 4 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south.
showers. waves 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest and diminishing to less than 10 knots overnight. a
chance of showers in the evening. waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots becoming northwest 15 to
20 knots. showers. waves 1 foot or less building to 2 to 4 feet. 
.thursday...northwest winds 15 to 20 knots. a chance of rain
showers during the day. waves 2 to 4 feet building to 3 to
5 feet. 
.friday...northwest winds 15 to 20 knots. waves 3 to 6 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon apr 27 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 30.3 inch high will build across the lower great lakes 
through monday. a 29.4 inch low over the great plains monday night 
will advance northeast into the upper great lakes later monday night 
into tuesday morning, while pushing a warm front across the lake. 
the low will head northeast to james bay tuesday night sending a 
cold front across the lake. an inverted trough averaging 29.7 inch 
inverted trough is expected across the lower great lakes wednesday 
through wednesday night. the trough/low will track to the coast of 
new england through friday while also deepening to 29.5 inches.


loz063>065-271500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon apr 27 2026

.today...southeast winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.tonight...east winds 10 to 15 knots becoming southeast 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south.
showers. waves 2 to 4 feet building to 3 to 5 feet. 
.tuesday night...south winds 15 to 20 knots becoming west 10 to
15 knots. showers likely in the evening, then a chance of showers
overnight. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots increasing to 15 to
20 knots. showers. waves 2 feet or less building to 2 to 4 feet. 
.thursday...northwest winds 15 to 25 knots. rain showers likely
during the day, then a chance of rain showers thursday night.
waves 3 to 5 feet building to 4 to 7 feet. waves occasionally
around 9 feet. 
.friday...northwest winds to 30 knots diminishing to 15 to
25 knots. a chance of rain showers. waves 6 to 9 feet subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 

$$