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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1005 pm edt fri mar 27 2026


slz022-024-280900-
saint lawrence river from cape vincent to saint regis
1005 pm edt fri mar 27 2026

.overnight...north winds less than 10 knots. partly to
mostly cloudy. 
.saturday...light and variable winds becoming west 10 to
15 knots. a chance of snow showers late in the morning. 
.saturday night...west winds 5 to 10 knots becoming southwest. a
chance of snow showers overnight. 
.sunday...south winds 5 to 15 knots becoming southwest. a chance
of snow showers in the morning. 
.sunday night...southwest winds 5 to 10 knots. mostly cloudy. 
.monday...southwest winds 10 knots or less becoming east. a
chance of rain showers monday night. 
.tuesday...east winds 5 to 15 knots becoming southwest. rain
showers. 
.wednesday...west winds 5 to 15 knots becoming north. rain
showers during the day, then a chance of rain and snow showers
wednesday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1004 pm edt fri mar 27 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 30.6 inch high will build from the upper 
mississippi valley tonight to the ohio valley by saturday afternoon, 
then off the mid atlantic coast sunday. 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.


loz062-280900-
lake ontario open waters from the niagara river to hamlin beach-
1004 pm edt fri mar 27 2026

.overnight...northwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 1 to 3 feet. 
.saturday...west winds 15 to 25 knots. waves 2 to 3 feet building
to 3 to 6 feet. 
.saturday night...west winds 15 to 20 knots becoming southwest.
waves 2 to 4 feet. 
.sunday...southwest winds 15 to 20 knots. waves 2 to 4 feet. 
.sunday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 2 to 4 feet. 
.monday...southwest winds 5 to 10 knots becoming southeast and
increasing to 15 to 20 knots. rain showers likely monday night.
waves 1 to 3 feet. 
.tuesday...south winds to 30 knots becoming southwest. showers
with a chance of thunderstorms. waves 3 to 5 feet building to
5 to 8 feet. waves occasionally around 10 feet. 
.wednesday...west winds 15 to 25 knots becoming northeast. rain
showers likely during the day, then a chance of rain and snow
showers wednesday night. waves 5 to 8 feet subsiding to 3 to
6 feet. waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1004 pm edt fri mar 27 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 30.6 inch high will build from the upper 
mississippi valley tonight to the ohio valley by saturday afternoon, 
then off the mid atlantic coast sunday. 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.


loz063-064-280900-
lake ontario open waters from hamlin beach to mexico bay-
1004 pm edt fri mar 27 2026

.overnight...northwest winds 10 to 15 knots becoming north.
waves 1 to 3 feet. 
.saturday...northwest winds 15 to 25 knots becoming west. a
chance of snow showers in the morning. waves 1 to 3 feet building
to 5 to 8 feet. waves occasionally around 10 feet. 
.saturday night...west winds 15 to 20 knots becoming southwest
10 to 15 knots. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.sunday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday night...southwest winds 10 to 15 knots. waves 1 to
3 feet. 
.monday...southwest winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of rain showers monday night. waves 1 to
3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest.
showers. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.wednesday...west winds 15 to 25 knots becoming north. rain
showers during the day, then a chance of rain and snow showers
wednesday night. waves 5 to 8 feet subsiding to 3 to 6 feet.
waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1004 pm edt fri mar 27 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 30.6 inch high will build from the upper 
mississippi valley tonight to the ohio valley by saturday afternoon, 
then off the mid atlantic coast sunday. 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.


loz065-280900-
lake ontario open waters from mexico bay to the saint lawrence
river-
1004 pm edt fri mar 27 2026

.overnight...north winds 5 to 10 knots. waves 1 foot or
less. 
.saturday...northwest winds 5 to 10 knots becoming west and
increasing to 15 to 20 knots. a chance of snow showers late in
the morning. waves 2 feet or less building to 4 to 7 feet. waves
occasionally around 9 feet. 
.saturday night...west winds 15 to 20 knots becoming southwest
10 to 15 knots. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.sunday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday night...southwest winds 10 to 15 knots. waves 1 to
3 feet. 
.monday...southwest winds 5 to 10 knots becoming southeast and
increasing to 15 to 20 knots. a chance of rain showers monday
night. waves 1 to 3 feet. 
.tuesday...southeast winds 15 to 25 knots becoming southwest.
showers. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.wednesday...west winds 15 to 25 knots becoming north. rain
showers during the day, then a chance of rain and snow showers
wednesday night. waves 5 to 8 feet subsiding to 2 to 4 feet.
waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$