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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt wed jul 29 2026


slz022-024-292100-
saint lawrence river from cape vincent to saint regis
1003 am edt wed jul 29 2026

.rest of today...north winds 5 to 10 knots. a chance of showers
late this morning, then showers likely with a chance of
thunderstorms this afternoon. 
.tonight...north winds 5 to 10 knots becoming northeast. showers
likely early, then a chance of showers late in the evening. 
.thursday...northeast winds 5 to 10 knots. a chance of showers in
the afternoon. 
.thursday night...northeast winds less than 10 knots. a chance of
showers in the evening. patchy fog. 
.friday...light and variable winds. patchy fog during the day. 
.saturday...south winds less than 10 knots. a chance of showers
saturday night. 
.sunday...south winds less than 10 knots. showers likely with a
chance of thunderstorms. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt wed jul 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 weak trough averaging 29.6 inches lingers over lake ontario 
through tonight. on thursday, the trough begins to exit eastward and 
a ridge averaging 30.0 inches builds from the western great lakes 
through thursday night. the ridge exits slowly eastward on friday 
through saturday before a cold front sweeps eastward across lake 
ontario this sunday.


loz062-292100-
lake ontario open waters from the niagara river to hamlin beach-
1003 am edt wed jul 29 2026

.rest of today...northwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 1 to 3 feet. 
.tonight...northwest winds 15 to 20 knots becoming north 10 to
15 knots. waves 1 to 3 feet. 
.thursday...north winds 5 to 15 knots becoming west. waves 1 to
3 feet subsiding to 1 foot or less. 
.thursday night...west winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.friday...west winds less than 10 knots becoming south. waves
1 foot or less. 
.saturday...southeast winds 10 knots or less. a chance of showers
saturday night. waves 1 foot or less. 
.sunday...east winds 5 to 10 knots becoming northeast. a chance
of showers and thunderstorms. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 291403
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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt wed jul 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 weak trough averaging 29.6 inches lingers over lake ontario 
through tonight. on thursday, the trough begins to exit eastward and 
a ridge averaging 30.0 inches builds from the western great lakes 
through thursday night. the ridge exits slowly eastward on friday 
through saturday before a cold front sweeps eastward across lake 
ontario this sunday.


loz063>065-292100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt wed jul 29 2026

.rest of today...northwest winds 15 to 20 knots diminishing to
10 to 15 knots. a chance of showers late this morning, then a
chance of showers and thunderstorms this afternoon. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...northwest winds 10 to 15 knots becoming north. a
chance of showers through the early overnight. waves 1 to 3 feet.
.thursday...north winds 5 to 15 knots becoming northwest. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.thursday night...northwest winds 10 knots or less becoming
north. waves 1 foot or less. 
.friday...north winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southeast winds 10 knots or less becoming south. a
chance of showers saturday night. waves 1 foot or less. 
.sunday...southeast winds 10 knots or less becoming northeast.
showers likely with a chance of thunderstorms. waves 1 foot or
less. 

winds and waves higher in and near thunderstorms.

$$