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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt tue sep 29 2026


slz022-024-300900-
saint lawrence river from cape vincent to saint regis
1003 pm edt tue sep 29 2026

.overnight...light and variable winds. patchy fog.

.wednesday...south winds 10 knots or less becoming southwest.
patchy fog early. 
.wednesday night...southwest winds 10 knots or less. mostly
cloudy. 
.thursday...southwest winds 5 to 15 knots. mostly sunny in the
morning, then becoming mostly cloudy. 
.thursday night...southwest winds 10 knots or less. a chance of
showers in the evening, then showers likely overnight. 
.friday...west winds less than 10 knots becoming northwest.
showers likely during the day, then a chance of showers friday
night. 
.saturday...northwest winds less than 10 knots. mainly clear,
then becoming partly cloudy. 
.sunday...southeast winds 10 knots or less becoming west. a
chance of rain showers sunday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue sep 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 29.9 inch low over the gulf of maine will dissipate 
over the north atlantic on wednesday as a 30.1 inch high builds just 
off the mid atlantic coast. a cold front over the upper great lakes 
wednesday night will cross the lower great lakes later thursday 
night and friday morning. a 30.4 inch high is then forecast to build 
into the upper great lakes friday and the lower great lakes by 
saturday, before exiting into northern maine sunday. meanwhile, a 
cold front will then cross the eastern great lakes sunday into 
monday.


loz062-300900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt tue sep 29 2026

.overnight...southeast winds 5 to 10 knots becoming south.
waves 1 foot or less. 
.wednesday...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.wednesday night...south winds 5 to 15 knots becoming southwest.
a chance of showers overnight. waves 2 feet or less. 
.thursday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers. waves 1 to 3 feet building to 2 to
4 feet. 
.thursday night...southwest winds 5 to 15 knots becoming west. a
chance of showers in the evening, then showers overnight. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 15 knots becoming north. showers
during the day, then a chance of showers friday night. waves 1 to
3 feet. 
.saturday...north winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.sunday...south winds 5 to 15 knots becoming northwest 15 to
20 knots. waves 2 feet or less building to 2 to 4 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue sep 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 29.9 inch low over the gulf of maine will dissipate 
over the north atlantic on wednesday as a 30.1 inch high builds just 
off the mid atlantic coast. a cold front over the upper great lakes 
wednesday night will cross the lower great lakes later thursday 
night and friday morning. a 30.4 inch high is then forecast to build 
into the upper great lakes friday and the lower great lakes by 
saturday, before exiting into northern maine sunday. meanwhile, a 
cold front will then cross the eastern great lakes sunday into 
monday.


loz063>065-300900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue sep 29 2026

.overnight...southeast winds 5 to 10 knots becoming south.
waves 1 foot or less. 
.wednesday...south winds 5 to 10 knots. waves 2 feet or less. 
.wednesday night...south winds 5 to 15 knots. waves 2 feet or
less. 
.thursday...southwest winds 15 to 20 knots. a chance of showers.
waves 1 to 3 feet building to 2 to 4 feet. 
.thursday night...southwest winds 5 to 15 knots becoming west. a
chance of showers in the evening, then showers likely overnight.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...west winds 5 to 15 knots becoming north 15 to 20 knots.
showers. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...north winds 5 to 15 knots becoming southeast. waves
1 to 3 feet subsiding to 1 foot or less. 
.sunday...south winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers. waves 1 to 3 feet building to 3 to
5 feet. 

$$