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


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

.today...southwest winds 5 to 10 knots. showers likely this
morning, then a chance of showers early this afternoon. showers
likely late. 
.tonight...southwest winds 5 to 10 knots becoming light and
variable. showers likely early. patchy fog late. 
.monday...light and variable winds. patchy fog in the morning. a
chance of showers in the afternoon. 
.monday night...light and variable winds. showers likely in the
evening, then showers overnight. 
.tuesday...northeast winds 10 knots or less becoming east.
showers during the day, then a chance of showers tuesday night. 
.wednesday...southeast winds 10 knots or less becoming south.
showers likely. 
.thursday...southwest winds less than 10 knots. a chance of
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun aug 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 frontal boundary north of the lake today will settle 
south across the lake tonight, then stall just southwest of the lake 
monday. the front will then move back northeast across the lake as a 
warm front monday night through early tuesday. the frontal zone will 
continue to meander north and south over or near the lake through 
much of the week.


loz062-301500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sun aug 30 2026

.today...southwest winds 5 to 10 knots. a chance of showers late
this morning. showers likely this afternoon. waves 1 foot or
less. 
.tonight...southwest winds 10 knots or less becoming east.
showers likely in the evening, then a chance of showers after
midnight. patchy fog after midnight. waves 1 foot or less. 
.monday...east winds 10 knots or less. showers likely in the
morning, then showers in the afternoon. waves 1 foot or less. 
.monday night...east winds 5 to 10 knots becoming south. showers.
waves 1 foot or less. 
.tuesday...south winds 5 to 10 knots becoming southeast. a chance
of showers during the day, then showers likely with a chance of
thunderstorms tuesday night. waves 2 feet or less. 
.wednesday...south winds 5 to 10 knots becoming southwest.
showers likely with a chance of thunderstorms. waves 1 foot or
less. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 1 foot or less. 

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 sun aug 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 frontal boundary north of the lake today will settle 
south across the lake tonight, then stall just southwest of the lake 
monday. the front will then move back northeast across the lake as a 
warm front monday night through early tuesday. the frontal zone will 
continue to meander north and south over or near the lake through 
much of the week.


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

.today...southwest winds 5 to 15 knots becoming west. a chance of
showers. showers likely late. waves 1 to 2 feet. 
.tonight...west winds 10 knots or less becoming northwest. a
chance of showers early. patchy fog after midnight. waves 2 feet
or less. 
.monday...southeast winds 10 knots or less becoming east. patchy
fog in the morning. showers likely in the afternoon. waves 1 foot
or less. 
.monday night...east winds 10 knots or less becoming south.
showers in the evening, then showers with a chance of
thunderstorms overnight. waves 1 foot or less. 
.tuesday...south winds 5 to 10 knots becoming southeast. showers
with a chance of thunderstorms during the day, then a chance of
showers tuesday night. waves 2 feet or less. 
.wednesday...south winds 5 to 15 knots becoming southwest.
showers likely with a chance of thunderstorms. waves 2 feet or
less. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$