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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt thu aug 27 2026


slz022-024-271500-
saint lawrence river from cape vincent to saint regis
403 am edt thu aug 27 2026

.today...south winds 5 to 15 knots becoming southwest. a chance
of showers late this morning. showers likely with a chance of
thunderstorms early this afternoon, then a chance of showers
late. 
.tonight...southwest winds 10 knots or less becoming northwest. a
chance of showers early. 
.friday...northwest winds less than 10 knots. becoming mostly
sunny. 
.friday night...light and variable winds. mainly clear. 
.saturday...southwest winds 10 knots or less. mainly clear, then
becoming partly cloudy. 
.sunday...southwest winds 10 knots or less. a chance of showers. 
.monday...northeast winds less than 10 knots becoming east. a
chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 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 pre-frontal trough will cross the lower great lakes 
today, followed by a weak cold front tonight. a 30.2 inch high will 
then build from the upper great lakes friday to the lower great 
lakes saturday before drifting off the new england coast sunday. a 
weak frontal boundary is then forecast to stall just north of the 
lake sunday night through tuesday.


loz062-271500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt thu aug 27 2026

.today...southwest winds 10 to 15 knots becoming west. showers
likely with a chance of thunderstorms early. waves 1 to 3 feet. 
.tonight...west winds 5 to 10 knots becoming northwest. waves
1 to 2 feet. 
.friday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.friday night...light and variable winds. waves 1 foot or less. 
.saturday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.sunday...southwest winds 5 to 10 knots becoming south. a chance
of showers during the day, then showers likely sunday night.
waves 1 foot or less. 
.monday...south winds 5 to 10 knots becoming southeast. showers
likely during the day, then a chance of showers monday night.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 270802
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 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 pre-frontal trough will cross the lower great lakes 
today, followed by a weak cold front tonight. a 30.2 inch high will 
then build from the upper great lakes friday to the lower great 
lakes saturday before drifting off the new england coast sunday. a 
weak frontal boundary is then forecast to stall just north of the 
lake sunday night through tuesday.


loz063>065-271500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu aug 27 2026

.today...south winds 15 to 20 knots becoming southwest 10 to
15 knots. showers likely with a chance of thunderstorms this
morning, then a chance of showers this afternoon. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots becoming northwest. a chance
of waterspouts late. waves 1 to 2 feet. 
.friday...north winds 5 to 10 knots becoming northwest. a chance
of waterspouts in the morning. waves 2 feet or less. 
.friday night...northwest winds less than 10 knots becoming west.
waves 1 foot or less. 
.saturday...west winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.sunday...southwest winds 5 to 15 knots. showers likely sunday
night. waves 2 feet or less. 
.monday...south winds 5 to 10 knots becoming east. showers likely
during the day, then a chance of showers monday night. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$