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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
405 am edt sun mar 29 2026


slz022-024-291500-
saint lawrence river from cape vincent to saint regis
405 am edt sun mar 29 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
404 am edt sun mar 29 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 strong 30.7 inch high over the ohio valley will move 
off the mid atlantic coast today. a 30.0 inch trough will sag 
southward across eastern canada monday, then move across the eastern 
great lakes monday night, followed by a deeper 29.5 inch low tuesday 
night into early wednesday. another 30.7 inch high across quebec is 
then forecast to extend down across the lake thursday.


loz062-291500-
lake ontario open waters from the niagara river to hamlin beach-
404 am edt sun mar 29 2026

.today...southwest winds 15 to 20 knots. waves 2 to 4 feet. 
.tonight...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots. waves 2 to 3 feet. 
.monday night...southwest winds 10 to 15 knots becoming south. a
chance of showers in the evening, then showers overnight. waves
1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. showers
with a chance of thunderstorms. waves 2 to 4 feet 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 showers wednesday
night. waves 3 to 6 feet subsiding to 3 to 5 feet. 
.thursday...northeast winds to 30 knots becoming east. a chance
of rain and snow showers during the day, then rain and snow
showers likely thursday night. waves 5 to 8 feet building to 6 to
10 feet. waves occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
404 am edt sun mar 29 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 strong 30.7 inch high over the ohio valley will move 
off the mid atlantic coast today. a 30.0 inch trough will sag 
southward across eastern canada monday, then move across the eastern 
great lakes monday night, followed by a deeper 29.5 inch low tuesday 
night into early wednesday. another 30.7 inch high across quebec is 
then forecast to extend down across the lake thursday.


loz063>065-291500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 am edt sun mar 29 2026

.today...south winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...southwest winds 5 to 15 knots becoming south. waves
1 to 3 feet. 
.monday...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.monday night...southwest winds 5 to 15 knots becoming southeast.
a chance of rain showers in the evening, then rain showers likely
overnight. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers with a chance of thunderstorms. waves 1 to
3 feet building to 3 to 6 feet. 
.wednesday...west winds 15 to 20 knots becoming northeast. rain
showers with a chance of thunderstorms during the day, then a
chance of rain showers wednesday night. waves 3 to 6 feet
subsiding to 3 to 5 feet. 
.thursday...northeast winds 15 to 25 knots becoming east. a
chance of rain and snow showers during the day, then rain and
snow showers likely thursday night. waves 3 to 6 feet building to
5 to 8 feet. waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$