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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt tue jun 30 2026


slz022-024-301500-
saint lawrence river from cape vincent to saint regis
403 am edt tue jun 30 2026

.today...light and variable winds becoming southwest 10 to
15 knots. a chance of showers and thunderstorms this afternoon. 
.tonight...southwest winds 5 to 10 knots. a chance of showers and
thunderstorms in the evening. a chance of showers and
thunderstorms late. 
.wednesday...southwest winds 5 to 10 knots. a chance of showers
and thunderstorms. 
.wednesday night...southwest winds 10 knots or less. a chance of
showers and thunderstorms in the evening. 
.thursday...southwest winds 5 to 15 knots. a chance of showers
and thunderstorms. 
.friday...west winds 10 knots or less becoming southwest. partly
cloudy. 
.saturday...west 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
402 am edt tue jun 30 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 warm front will cross the lake today, then a 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 and cross the lake friday into saturday.


loz063>065-301500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue jun 30 2026

.today...south winds 5 to 10 knots. a chance of showers and
thunderstorms. waves 2 feet or less. 
.tonight...southwest winds 5 to 15 knots. a chance of showers and
thunderstorms late in the evening. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots. waves 1 to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots. 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 friday night. 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.

$$