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


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

.rest of tonight...light and variable winds. mainly clear late
this evening, then becoming partly cloudy. 
.tuesday...south winds 10 knots or less becoming southwest. a
chance of showers and thunderstorms from late morning on. 
.tuesday night...southwest winds 5 to 10 knots. a chance of
showers and thunderstorms. 
.wednesday...southwest winds 5 to 10 knots. a chance of showers
and thunderstorms. 
.wednesday night...southwest winds 5 to 10 knots. a chance of
showers and thunderstorms in the evening. 
.thursday...southwest winds 5 to 10 knots. a chance of showers
and thunderstorms. 
.friday...southwest winds 10 knots or less. a chance of showers
during the day, then a chance of showers and thunderstorms friday
night. 
.saturday...southwest winds less than 10 knots. a chance of
showers and thunderstorms. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon jun 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 30.1 inch high over new england will move offshore by 
tuesday. a warm front will cross the lake on tuesday, then another 
30.1 inch high will build into the ohio valley and mid atlantic by 
wednesday, where it will remain through at least thursday. a weak 
29.9 inch trough will then approach the lake friday into saturday.


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

.overnight...east winds 5 to 10 knots becoming south. waves
1 foot or less. 
.tuesday...southwest winds 10 knots or less increasing to 10 to
15 knots. a chance of showers and thunderstorms in the morning.
waves 2 feet or less. 
.tuesday night...southwest winds 10 to 15 knots. waves 1 to
3 feet. 
.wednesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.wednesday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 1 to 3 feet. 
.thursday...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.friday...west winds 5 to 10 knots becoming southwest. a chance
of showers and thunderstorms. waves 1 to 2 feet. 
.saturday...west winds 5 to 10 knots becoming northwest. a chance
of showers and thunderstorms. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon jun 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 30.1 inch high over new england will move offshore by 
tuesday. a warm front will cross the lake on tuesday, then another 
30.1 inch high will build into the ohio valley and mid atlantic by 
wednesday, where it will remain through at least thursday. a weak 
29.9 inch trough will then approach the lake friday into saturday.


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

.overnight...east winds 5 to 10 knots becoming south. waves
1 foot or less. 
.tuesday...south winds 5 to 10 knots. a chance of showers and
thunderstorms. waves 2 feet or less. 
.tuesday night...southwest winds 5 to 15 knots. waves 2 feet or
less. 
.wednesday...southwest winds 10 to 15 knots becoming west. waves
1 to 2 feet. 
.wednesday night...west winds 5 to 15 knots becoming southwest.
waves 1 to 3 feet. 
.thursday...southwest winds 10 to 15 knots becoming west. waves
1 to 3 feet. 
.friday...west winds 5 to 15 knots. a chance of showers and
thunderstorms. waves 1 to 2 feet. 
.saturday...west winds 5 to 10 knots. a chance of showers and
thunderstorms. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$