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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1012 pm edt sun mar 29 2026


slz022-024-300900-
saint lawrence river from cape vincent to saint regis
1012 pm edt sun mar 29 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 pm 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 30.6 inch high will continue to drift off the mid 
atlantic coast tonight. 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. a strong 30.7 inch high across quebec is then 
forecast to extend down across the lake thursday.


loz063>065-300900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 pm edt sun mar 29 2026

.overnight...southeast winds 5 to 15 knots becoming south.
waves 1 to 2 feet. 
.monday...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.monday night...southwest winds 5 to 10 knots becoming east. a
chance of rain showers in the evening, then rain showers likely
overnight. waves 1 to 3 feet. 
.tuesday...east winds 10 to 15 knots becoming southeast. rain.
waves 1 to 3 feet. 
.tuesday night...south winds 15 to 20 knots becoming west. rain
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
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 east to
30 knots. rain showers with snow showers and freezing rain
likely. waves 5 to 8 feet building to 5 to 9 feet. waves
occasionally around 11 feet. 
.friday...southeast winds 15 to 25 knots becoming northeast. rain
showers. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$