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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sat jul 4 2026


slz022-024-050900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sat jul 4 2026

.overnight...light and variable winds. mainly clear. 
.sunday...north winds less than 10 knots becoming northeast.
sunny.
.sunday night...northeast winds less than 10 knots. partly to
mostly cloudy. 
.monday...northeast winds less than 10 knots becoming east. a
chance of showers in the afternoon. 
.monday night...east winds less than 10 knots. partly to mostly
cloudy. 
.tuesday...east winds less than 10 knots. partly cloudy. 
.wednesday...southwest winds 10 knots or less. mainly clear, then
becoming partly cloudy. 
.thursday...southwest winds 10 knots or less becoming west. a
chance of showers and thunderstorms during the day, then showers
likely with a chance of thunderstorms thursday night. 

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 sat jul 4 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 30.2 inch surface high will build from hudson bay 
tonight to quebec and northern new england by 
sunday night. a weak 29.9 inch low will then develop over ohio late 
sunday and move to the mid atlantic by late monday. a broad 30.1 
inch high is then forecast to build into the great lakes tuesday 
through wednesday. a cold frontal boundary will slide southeast 
across the lake thursday.


loz062-050900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sat jul 4 2026

.overnight...east winds 10 knots or less becoming
northeast. areas of fog. waves 1 foot or less. 
.sunday...northeast winds 5 to 15 knots becoming east. areas of
fog early. waves 1 to 3 feet. 
.sunday night...east winds 5 to 15 knots becoming northeast.
waves 2 feet or less. 
.monday...northeast winds 10 to 15 knots becoming east 15 to
20 knots. a chance of showers. waves 1 to 3 feet. 
.monday night...east winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers in the evening. waves 1 to 3 feet. 
.tuesday...northeast winds 10 knots or less becoming southwest.
waves 2 feet or less. 
.wednesday...southwest winds 10 knots or less. waves 1 foot or
less. 
.thursday...southwest winds 5 to 15 knots becoming west. a chance
of showers. waves 1 foot or less. 

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat jul 4 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 30.2 inch surface high will build from hudson bay 
tonight to quebec and northern new england by 
sunday night. a weak 29.9 inch low will then develop over ohio late 
sunday and move to the mid atlantic by late monday. a broad 30.1 
inch high is then forecast to build into the great lakes tuesday 
through wednesday. a cold frontal boundary will slide southeast 
across the lake thursday.


loz063>065-050900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat jul 4 2026

.overnight...northeast winds 10 knots or less. areas of fog
after midnight. waves 1 foot or less. 
.sunday...northeast winds 5 to 10 knots. areas of fog early.
waves 1 foot or less. 
.sunday night...northeast winds 5 to 10 knots becoming east. a
chance of showers overnight. waves 2 feet or less. 
.monday...east winds 5 to 15 knots. a chance of showers. waves
2 feet or less. 
.monday night...east winds 5 to 15 knots. a chance of showers.
waves 2 feet or less. 
.tuesday...east winds 10 knots or less becoming southwest. a
chance of showers during the day. waves 1 foot or less. 
.wednesday...southwest winds 5 to 10 knots. waves 1 foot or less.
.thursday...southwest winds 5 to 10 knots becoming west. a chance
of showers. waves 1 foot or less. 

$$