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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sun apr 26 2026


slz022-024-270300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun apr 26 2026

.tonight...northeast winds less than 10 knots. clear.
.monday...light and variable winds. sunny.
.monday night...light and variable winds becoming southeast 5 to
10 knots. mainly clear in the evening, then becoming partly
cloudy. 
.tuesday...south winds 10 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 likely. 
.thursday...northwest winds 5 to 10 knots. rain showers likely
during the day, then a chance of rain showers thursday night. 
.friday...northwest winds 5 to 10 knots. a chance of rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun apr 26 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.


loz062-270300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt sun apr 26 2026

.tonight...north winds less than 10 knots becoming east. waves
1 foot or less. 
.monday...east winds 10 knots or less increasing to 10 to
15 knots. waves 2 feet or less. 
.monday night...east winds 15 to 20 knots becoming southeast
10 to 15 knots. waves 1 to 3 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 5 to 15 knots. showers likely in the evening, then a
chance of showers overnight. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.wednesday...north winds 5 to 15 knots becoming northwest.
showers likely. waves 1 to 3 feet. 
.thursday...northwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of rain showers during the day. waves 1 to
3 feet building to 2 to 4 feet. 
.friday...northwest winds 15 to 20 knots. waves 2 to 4 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun apr 26 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>065-270300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun apr 26 2026

.tonight...west winds 5 to 10 knots becoming light and variable.
waves 2 feet or less. 
.monday...light and variable winds becoming northeast 5 to
10 knots. waves 1 foot or less. 
.monday night...east winds 10 to 15 knots becoming southeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. showers
likely. waves 3 to 5 feet. 
.tuesday night...south winds 15 to 20 knots becoming southwest
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...southwest winds 5 to 15 knots becoming northwest
15 to 20 knots. showers likely. waves 1 to 3 feet. 
.thursday...northwest winds 15 to 20 knots. rain showers likely
during the day. waves 2 to 4 feet building to 3 to 5 feet. 
.friday...northwest winds 15 to 25 knots. a chance of rain
showers. waves 3 to 6 feet building to 4 to 7 feet, then
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
338 pm edt sun apr 26 2026

for waters beyond five nautical miles of shore on lake erie

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 high pressure ridge averaging 30.00 inches exits slowly eastward
from the lake erie region through monday. during monday night
through tuesday night, a low should wobble north-northeastward
from the upper mississippi valley to hudson bay and deepen to
29.10 inches. this low track should allow a warm front to sweep
northeastward across lake erie monday night through tuesday
morning and a cold front to sweep eastward across the lake late
tuesday afternoon through tuesday night. behind the cold front, a
trough averaging 29.80 inches should linger over lake erie on 
wednesday before a ridge averaging 30.00 inches builds from the 
north-central united states and vicinity wednesday night through 
this friday.


lez061-168-169-270215-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
338 pm edt sun apr 26 2026

.tonight...northeast winds 5 to 10 knots becoming east. waves
2 feet or less. 
.monday...east winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.monday night...east winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. a chance of showers overnight.
waves 1 to 3 feet building to 3 to 6 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest and
diminishing to 10 to 15 knots. showers likely. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.tuesday night...southwest winds 5 to 15 knots becoming
northwest. a chance of showers in the evening. waves 1 to 3 feet.
.wednesday...northeast winds 5 to 15 knots becoming northwest.
showers likely during the day. waves 1 to 2 feet. 
.thursday...northwest winds 10 to 15 knots. waves 1 to 2 feet. 
.friday...northwest winds 10 to 15 knots. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$