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


slz022-024-161500-
saint lawrence river from cape vincent to saint regis
403 am edt wed sep 16 2026

.today...southwest winds 10 knots or less becoming northwest.
mostly cloudy. 
.tonight...light and variable winds. patchy fog after midnight. 
.thursday...northeast winds less than 10 knots. a chance of
showers. 
.thursday night...light and variable winds. partly cloudy. 
.friday...northwest winds 10 knots or less becoming northeast.
mainly clear, then becoming partly cloudy. 
.saturday...northeast winds less than 10 knots. a chance of
showers. 
.sunday...northeast winds 5 to 10 knots. a chance of showers
during the day. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch area of high pressure southeast of the lake this morning 
will settle off the mid-atlantic coastline this afternoon. this will 
allow for a weak cold front to slide across the lake today, stalling 
near the new york and pennsylvania state line tonight. a 30.2 inch 
area of low pressure riding along this stalled frontal boundary will 
lift this front back northward to near the lake's southern shoreline 
thursday afternoon, before the 30.2 inch surface low now across 
western new york thursday afternoon carries a cold front southeast 
of the lake thursday night. an area of surface high pressure 
averaging 30.2 inches will then build across the upper great lakes 
thursday, and then to new england saturday. following the departure 
of the surface high, a 29.9 inch surface low and warm front will 
near the lake from the ohio valley on sunday.


loz062-161500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt wed sep 16 2026

.today...west winds 10 knots or less becoming northwest. waves
1 foot or less. 
.tonight...northwest winds 10 knots or less becoming east. waves
1 foot or less. 
.thursday...northeast winds 10 knots or less becoming north. a
chance of showers. waves 1 foot or less. 
.thursday night...northwest winds 10 knots or less. waves 2 feet
or less. 
.friday...north winds 5 to 15 knots becoming east. waves 1 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 4 feet. 
.sunday...northeast winds 15 to 20 knots. a chance of showers
during the day. waves 3 to 5 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch area of high pressure southeast of the lake this morning 
will settle off the mid-atlantic coastline this afternoon. this will 
allow for a weak cold front to slide across the lake today, stalling 
near the new york and pennsylvania state line tonight. a 30.2 inch 
area of low pressure riding along this stalled frontal boundary will 
lift this front back northward to near the lake's southern shoreline 
thursday afternoon, before the 30.2 inch surface low now across 
western new york thursday afternoon carries a cold front southeast 
of the lake thursday night. an area of surface high pressure 
averaging 30.2 inches will then build across the upper great lakes 
thursday, and then to new england saturday. following the departure 
of the surface high, a 29.9 inch surface low and warm front will 
near the lake from the ohio valley on sunday.


loz063>065-161500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed sep 16 2026

.today...southwest winds 5 to 15 knots becoming west less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.tonight...northwest winds 10 knots or less becoming east. waves
1 foot or less. 
.thursday...east winds less than 10 knots becoming north. a
chance of showers. waves 1 foot or less. 
.thursday night...northwest winds 10 knots or less increasing to
10 to 15 knots. waves 2 feet or less. 
.friday...north winds 15 to 20 knots becoming east 10 to
15 knots. waves 1 to 3 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers during
the day, then showers likely saturday night. waves 1 to 3 feet. 
.sunday...northeast winds 15 to 20 knots. showers likely during
the day. waves 1 to 3 feet building to 2 to 4 feet. 

$$