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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt tue apr 28 2026


slz022-024-282100-
saint lawrence river from cape vincent to saint regis
1003 am edt tue apr 28 2026

.this afternoon...south winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers early. showers
likely late. 
.tonight...south winds 5 to 15 knots becoming southwest. a chance
of showers. 
.wednesday...southwest winds less than 10 knots becoming east. a
chance of showers in the morning, then showers in the afternoon. 
.wednesday night...northeast winds 10 knots or less becoming
southwest. showers.
.thursday...west winds 5 to 10 knots. rain showers during the
day, then a chance of rain showers thursday night. 
.friday...west winds 5 to 10 knots. a chance of rain showers. 
.saturday...west winds 10 knots or less becoming southwest. a
chance of rain showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue apr 28 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 low over the upper great lakes this morning 
will track into ontario today, while pushing a warm front across the 
lake. the low will then continue northeast to james bay tonight 
sending a cold front across the lake. an inverted trough averaging 
29.7 inches is expected across the lower great lakes wednesday 
through wednesday night. the trough/low will track to the canadian 
maritimes, while also elongating south along the coast of new 
england thursday through friday. the remnants of the sfc low will 
then retrograde northwest to near james bay as a 29.5 inch low 
tracks across the se u.s. and out to sea from the delmarva on 
saturday.


loz062-282100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt tue apr 28 2026

.rest of today...southeast winds 15 to 20 knots becoming south.
showers, then a chance of showers late. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tonight...south winds 15 to 20 knots becoming northwest and
diminishing to 10 knots or less after midnight. a chance of
showers in the evening. waves 1 to 3 feet subsiding to 1 foot or
less. 
.wednesday...north winds 5 to 15 knots. a chance of showers in
the morning, then showers in the afternoon. waves 2 feet or less.
.wednesday night...northwest winds 10 to 15 knots becoming west
15 to 20 knots. rain showers. waves 1 to 3 feet building to 2 to
4 feet. 
.thursday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.friday...west winds 10 to 15 knots. waves 2 to 3 feet. 
.saturday...west winds 10 to 15 knots. waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue apr 28 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 low over the upper great lakes this morning 
will track into ontario today, while pushing a warm front across the 
lake. the low will then continue northeast to james bay tonight 
sending a cold front across the lake. an inverted trough averaging 
29.7 inches is expected across the lower great lakes wednesday 
through wednesday night. the trough/low will track to the canadian 
maritimes, while also elongating south along the coast of new 
england thursday through friday. the remnants of the sfc low will 
then retrograde northwest to near james bay as a 29.5 inch low 
tracks across the se u.s. and out to sea from the delmarva on 
saturday.


loz063>065-282100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt tue apr 28 2026

.rest of today...south winds 15 to 25 knots. a chance of showers
late this morning, then showers this afternoon. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.tonight...south winds 15 to 25 knots becoming southwest and
diminishing to 10 to 15 knots. showers likely early, then a
chance of showers. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...south winds 5 to 10 knots becoming north. a chance
of showers in the morning, then showers in the afternoon. waves
2 feet or less. 
.wednesday night...north winds 10 to 15 knots becoming west 15 to
20 knots. showers. waves 1 to 3 feet building to 3 to 5 feet. 
.thursday...west winds 15 to 20 knots. a chance of rain showers
during the day. waves 3 to 6 feet. 
.friday...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 2 to 4 feet. 
.saturday...west winds 10 to 15 knots. waves 1 to 3 feet. 

$$