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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt wed sep 16 2026


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1003 pm edt wed sep 16 2026

.overnight...north winds 10 knots or less becoming
northeast. mostly cloudy. 
.thursday...northeast winds 10 knots or less becoming north.
mostly cloudy early, then becoming mostly sunny. 
.thursday night...north winds less than 10 knots. partly cloudy. 
.friday...northwest winds 5 to 10 knots becoming north. sunny.
.friday night...north winds 10 knots or less becoming northeast.
partly cloudy. 
.saturday...northeast winds less than 10 knots. showers likely
saturday night. 
.sunday...northeast winds 5 to 10 knots becoming north. showers
likely during the day. 
.monday...northeast winds 5 to 10 knots. mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt wed sep 16 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 weak cold front will settle south of the lake this 
evening, then stall just south of the lake thursday. a 30.4 inch 
high will then build from northwest ontario province thursday night 
to southern quebec by saturday morning before moving off the new 
england coast by sunday while weakening to 30.2 inches. another 30.4 
inch high will then build from northwest ontario province sunday to 
western quebec monday. meanwhile, a 29.8 inch low will move into the 
lower ohio valley by monday.


loz062-170900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt wed sep 16 2026

.overnight...north winds 5 to 10 knots becoming northeast.
waves 2 feet or less. 
.thursday...northeast winds 10 knots or less becoming northwest.
a chance of showers early. waves 1 to 2 feet. 
.thursday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 
.friday night...north winds 5 to 15 knots becoming east. waves
2 feet or less building to 2 to 3 feet. 
.saturday...east winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers during the day, then showers likely
saturday night. waves 2 to 3 feet. 
.sunday...northeast winds 15 to 20 knots. showers likely during
the day. waves 2 to 4 feet building to 3 to 6 feet. 
.monday...northeast winds 15 to 25 knots becoming east. a chance
of showers monday night. waves 4 to 7 feet. waves occasionally
around 9 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt wed sep 16 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 weak cold front will settle south of the lake this 
evening, then stall just south of the lake thursday. a 30.4 inch 
high will then build from northwest ontario province thursday night 
to southern quebec by saturday morning before moving off the new 
england coast by sunday while weakening to 30.2 inches. another 30.4 
inch high will then build from northwest ontario province sunday to 
western quebec monday. meanwhile, a 29.8 inch low will move into the 
lower ohio valley by monday.


loz063>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt wed sep 16 2026

.overnight...west winds 5 to 10 knots becoming southeast.
waves 2 feet or less. 
.thursday...southeast winds 5 to 10 knots becoming north. a
chance of showers in the morning. waves 2 feet or less. 
.thursday night...northwest winds 5 to 15 knots. waves 2 feet or
less. 
.friday...northwest winds 10 to 15 knots becoming north. waves
1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.saturday...east winds 5 to 15 knots becoming southeast. showers
likely saturday night. waves 1 to 3 feet. 
.sunday...northeast winds 15 to 20 knots. showers likely during
the day. waves 2 to 4 feet building to 3 to 5 feet. 
.monday...northeast winds 15 to 25 knots becoming east. a chance
of showers monday night. waves 3 to 5 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
352 am edt thu sep 17 2026

for waters beyond five nautical miles of shore on lake erie

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 stationary front will slowly sag south tonight into thursday,
followed by high pressure of 30.20 inches for friday. low 
pressure 29.90 inches will track east in the vicinity of lake erie
on saturday and extend a cold front through the area on sunday. a
trough averaging 29.90 inches will linger behind the front into 
early next week while high pressure of 30.40 inches sets up north 
of the great lakes. 


lez061-168-169-171415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
352 am edt thu sep 17 2026

.today...northeast winds 10 knots or less becoming north. a
slight chance of showers this morning. waves 2 feet or less. 
.tonight...north winds 10 knots or less increasing to 10 to
15 knots. a slight chance of showers after midnight. waves 2 feet
or less. 
.friday...north winds 15 to 20 knots becoming northeast 5 to
15 knots. waves 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming south. a chance of
showers during the day, then showers saturday night. waves 1 to
3 feet. 
.sunday...northeast winds 15 to 25 knots. showers likely during
the day. waves 2 to 4 feet building to 3 to 6 feet. 
.monday...northeast winds to 30 knots becoming east. a chance of
showers monday night. waves 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$