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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 am edt mon mar 30 2026


slz022-024-301500-
saint lawrence river from cape vincent to saint regis
404 am edt mon mar 30 2026

.today...southwest winds 5 to 15 knots. partly sunny this
morning, then becoming mostly cloudy. 
.tonight...west winds 10 knots or less becoming northeast. rain
showers likely late. 
.tuesday...northeast winds 10 to 15 knots. rain showers. 
.tuesday night...northeast winds 5 to 15 knots becoming west.
rain showers. 
.wednesday...west winds 5 to 10 knots becoming northeast. rain
showers likely during the day, then a chance of snow showers
wednesday night. 
.thursday...northeast winds 10 to 15 knots becoming east. snow
and rain showers likely during the day, then rain showers, snow
showers and freezing rain thursday night. 
.friday...south winds 5 to 15 knots becoming north. rain showers
and freezing rain during the day, then rain showers likely friday
night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt mon mar 30 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 frontal zone will stall near the lake tonight through 
tuesday. a 29.6 inch low will then move across southern ontario 
province tuesday evening before reaching the canadian maritimes 
wednesday, with a trailing cold front moving south across the lake. 
a 30.6 inch high will then build east across ontario and quebec 
wednesday through thursday. a 29.6 inch low is then forecast to move 
into the central great lakes thursday night before reaching southern 
quebec late friday.


loz062-301500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt mon mar 30 2026

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

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt mon mar 30 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 frontal zone will stall near the lake tonight through 
tuesday. a 29.6 inch low will then move across southern ontario 
province tuesday evening before reaching the canadian maritimes 
wednesday, with a trailing cold front moving south across the lake. 
a 30.6 inch high will then build east across ontario and quebec 
wednesday through thursday. a 29.6 inch low is then forecast to move 
into the central great lakes thursday night before reaching southern 
quebec late friday.


loz063>065-301500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt mon mar 30 2026

.today...south winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.tonight...southwest winds 5 to 10 knots becoming northeast. a
chance of rain showers late in the evening. rain showers after
midnight, then rain showers with a chance of thunderstorms late.
waves 1 to 3 feet. 
.tuesday...northeast winds 5 to 15 knots becoming east. rain
showers with a chance of thunderstorms. waves 2 feet or less. 
.tuesday night...south winds 10 to 15 knots becoming west 15 to
20 knots. rain showers with a chance of thunderstorms. waves
2 feet or less building to 3 to 6 feet. 
.wednesday...west winds 15 to 20 knots becoming northeast. rain
showers during the day, then a chance of rain and snow showers
wednesday night. waves 3 to 6 feet subsiding to 3 to 5 feet. 
.thursday...northeast winds 15 to 25 knots becoming southeast.
rain and snow showers during the day, then rain showers thursday
night. waves 4 to 7 feet. waves occasionally around 9 feet. 
.friday...south winds 15 to 25 knots becoming north. rain
showers. waves 3 to 6 feet subsiding to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$