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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt tue jun 9 2026


slz022-024-100900-
saint lawrence river from cape vincent to saint regis
1003 pm edt tue jun 9 2026

.overnight...light and variable winds. a chance of showers
and thunderstorms. 
.wednesday...south winds 5 to 10 knots. showers in the morning,
then showers with a chance of thunderstorms in the afternoon. 
.wednesday night...south winds 10 knots or less becoming
southwest. showers with a chance of thunderstorms in the evening,
then showers likely overnight. 
.thursday...southwest winds 10 knots or less. a chance of showers
in the morning, then a chance of showers and thunderstorms in the
afternoon. 
.thursday night...southwest winds less than 10 knots. a chance of
showers and thunderstorms in the evening. 
.friday...south winds 5 to 10 knots becoming southwest. showers
likely with a chance of thunderstorms. 
.saturday...southwest winds 10 knots or less. mainly clear. 
.sunday...southwest winds 10 knots or less. a chance of showers. 

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 tue jun 9 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 high near the delmarva will track offshore 
this afternoon, where it will remain anchored through wednesday. 
meanwhile, a 29.8 inch low over lower michigan this afternoon will 
slowly track northeast into southeastern ontario by wednesday 
morning while sending an attendant warm front across the lake, then 
weakens while moving into southern quebec wednesday evening. another 
warm front will cross the lake thursday night in advance of a 29.7 
inch trough that will cross the lake later friday, which will also 
send an attendant cold front across the lake friday afternoon and 
evening. a 30.0 inch high will then ridge across the lake later 
friday night through sunday morning, before the next cold front 
crosses the lake later sunday or sunday night.


loz062-100900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt tue jun 9 2026

.overnight...southeast winds 5 to 10 knots. showers with a
chance of thunderstorms. waves 1 foot or less. 
.wednesday...south winds 10 to 15 knots becoming southwest.
showers likely with a chance of thunderstorms early, then a
chance of showers and thunderstorms late in the morning. waves
2 feet or less. 
.wednesday night...west winds 5 to 15 knots becoming southwest.
showers likely with a chance of thunderstorms overnight. waves
1 to 2 feet. 
.thursday...southwest winds 5 to 15 knots. showers likely. waves
1 to 2 feet. 
.thursday night...southwest winds 5 to 15 knots. waves 1 to
2 feet. 
.friday...southwest winds 15 to 20 knots becoming west 5 to
15 knots. showers likely with a chance of thunderstorms. waves
1 to 3 feet. 
.saturday...west winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.sunday...southwest winds 5 to 10 knots becoming west. a chance
of showers. waves 1 to 2 feet. 

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 tue jun 9 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 high near the delmarva will track offshore 
this afternoon, where it will remain anchored through wednesday. 
meanwhile, a 29.8 inch low over lower michigan this afternoon will 
slowly track northeast into southeastern ontario by wednesday 
morning while sending an attendant warm front across the lake, then 
weakens while moving into southern quebec wednesday evening. another 
warm front will cross the lake thursday night in advance of a 29.7 
inch trough that will cross the lake later friday, which will also 
send an attendant cold front across the lake friday afternoon and 
evening. a 30.0 inch high will then ridge across the lake later 
friday night through sunday morning, before the next cold front 
crosses the lake later sunday or sunday night.


loz063>065-100900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue jun 9 2026

.overnight...south winds 10 knots or less becoming
southeast. showers likely with a chance of thunderstorms. waves
1 foot or less. 
.wednesday...south winds 5 to 15 knots becoming southwest.
showers likely with a chance of thunderstorms. waves 2 feet or
less. 
.wednesday night...southwest winds 5 to 10 knots. a chance of
showers and thunderstorms in the evening, then showers likely
with a chance of thunderstorms overnight. waves 2 feet or less. 
.thursday...southwest winds 5 to 10 knots. showers likely with a
chance of thunderstorms in the morning, then a chance of showers
and thunderstorms in the afternoon. waves 2 feet or less. 
.thursday night...southwest winds 10 knots or less. a chance of
showers and thunderstorms in the evening. waves 2 feet or less. 
.friday...south winds 5 to 15 knots becoming west. showers with a
chance of thunderstorms. waves 1 foot or less building to 1 to
3 feet. 
.saturday...west winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.sunday...southwest winds 5 to 15 knots becoming west. a chance
of showers. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$