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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt wed may 13 2026


slz022-024-132100-
saint lawrence river from cape vincent to saint regis
1003 am edt wed may 13 2026

.this afternoon...southeast winds 10 to 15 knots becoming south.
showers.
.tonight...south winds 10 knots or less becoming southwest.
showers likely early, then a chance of showers late in the
evening. 
.thursday...southwest winds less than 10 knots. a chance of
showers. 
.thursday night...light and variable winds. a chance of showers. 
.friday...north winds 10 knots or less becoming southwest. partly
to mostly cloudy. 
.saturday...southwest winds 10 to 15 knots diminishing to 5 to
10 knots. becoming mainly clear. 
.sunday...west winds 10 knots or less becoming east. partly
cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt wed may 13 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 29.6 inch low over the central great lakes this 
morning will move slowly east, just to the north of lake ontario by 
this evening, then will weaken into a trough as it slowly drifts 
over eastern new york and new england thursday. a 30.0 inch high 
will then build from the central great lakes and ohio valley 
thursday night to the lower great lakes and mid atlantic friday, 
then off the carolina coast saturday. a 29.3 inch low over the 
central plains will then push its' warm front into the lower great 
lakes region sunday and sunday night.


loz062-132100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt wed may 13 2026

.rest of today...south winds 15 to 20 knots becoming southwest. a
chance of showers. waves 2 to 4 feet. 
.tonight...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers. waves 2 feet or less. 
.thursday night...northwest winds 5 to 10 knots. a chance of
showers in the evening. waves 1 foot or less. 
.friday...west winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.saturday...southwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 1 to 3 feet building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 knots or less becoming east. a
chance of showers. waves 2 feet or less. 

$$

fzus61 kbuf 131402
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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt wed may 13 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 29.6 inch low over the central great lakes this 
morning will move slowly east, just to the north of lake ontario by 
this evening, then will weaken into a trough as it slowly drifts 
over eastern new york and new england thursday. a 30.0 inch high 
will then build from the central great lakes and ohio valley 
thursday night to the lower great lakes and mid atlantic friday, 
then off the carolina coast saturday. a 29.3 inch low over the 
central plains will then push its' warm front into the lower great 
lakes region sunday and sunday night.


loz063>065-132100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt wed may 13 2026

.rest of today...south winds 15 to 25 knots becoming southwest.
showers likely late this morning, then showers likely with a
chance of thunderstorms early this afternoon. a chance of showers
and thunderstorms late. waves 3 to 5 feet subsiding to 2 to
4 feet. 
.tonight...southwest winds 5 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.thursday...southwest winds 10 knots or less becoming northwest.
a chance of showers in the afternoon. waves 2 feet or less. 
.thursday night...west winds 5 to 10 knots becoming northwest. a
chance of showers. waves 2 feet or less. 
.friday...northwest winds 5 to 15 knots becoming south. a chance
of showers during the day. waves 2 feet or less. 
.saturday...south winds 10 to 15 knots becoming west. a chance of
showers. waves 1 to 3 feet. 
.sunday...west winds 5 to 10 knots becoming east. a chance of
showers. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$