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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sat aug 22 2026


slz022-024-230300-
saint lawrence river from cape vincent to saint regis
403 pm edt sat aug 22 2026

.tonight...southeast winds 10 knots or less increasing to 10 to
15 knots. a chance of showers and thunderstorms after midnight.
showers likely with a chance of thunderstorms late. 
.sunday...southeast winds 10 to 15 knots becoming southwest.
showers with a chance of thunderstorms. 
.sunday night...southwest winds 10 to 15 knots. a chance of
showers in the evening, then showers overnight. 
.monday...southwest winds 5 to 15 knots. showers in the morning,
then showers with a chance of thunderstorms in the afternoon. 
.monday night...southwest winds 5 to 10 knots. showers likely in
the evening, then a chance of showers overnight. 
.tuesday...west winds 5 to 10 knots becoming light and variable.
a chance of showers and thunderstorms. 
.wednesday...southwest winds less than 10 knots becoming south.
partly cloudy. 
.thursday...south winds 10 knots or less. a chance of showers
during the day, then showers likely 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
402 pm edt sat aug 22 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 high pressure ridge averaging 30.1 inches exits toward 
the canadian maritimes today. elsewhere, a 29.6 inch low should 
wobble northeastward from the central great lakes to southwestern 
quebec through monday. in response to the low's track, a warm front 
drifts northeastward across lake ontario tonight and then a cold 
front sweeps eastward across the lake overnight tonight through 
sunday. behind the cold front, a trough averaging 29.8 inches 
lingers over lake ontario through monday. on tuesday through 
wednesday, a ridge averaging 30.1 inches builds from the western and 
central great lakes. the ridge should begin to exit eastward on 
thursday and allow a warm front to sweep northeastward across lake 
ontario.


loz062-230300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt sat aug 22 2026

.tonight...east winds 5 to 15 knots becoming south. showers with
a chance of thunderstorms. some thunderstorms may be severe with
strong winds and large hail early. waves 1 to 2 feet. 
.sunday...southwest winds 15 to 20 knots becoming west. a chance
of waterspouts. showers likely early, then a chance of showers
late in the morning. showers likely with a chance of
thunderstorms in the afternoon. waves 1 to 3 feet building to
3 to 6 feet. 
.sunday night...west winds 15 to 20 knots. a chance of
waterspouts. showers likely with a chance of thunderstorms in the
evening, then showers overnight. waves 4 to 6 feet. 
.monday...southwest winds 15 to 25 knots becoming west. a chance
of waterspouts. showers. waves 5 to 8 feet. waves occasionally
around 10 feet. 
.monday night...west winds 15 to 20 knots. a chance of
waterspouts. showers likely in the evening, then a chance of
showers overnight. waves 4 to 7 feet subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 10 knots or
less. a chance of waterspouts during the day. showers likely
during the day. waves 2 to 4 feet subsiding to 1 foot or less. 
.wednesday...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.thursday...south winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms. 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 pm edt sat aug 22 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 high pressure ridge averaging 30.1 inches exits toward 
the canadian maritimes today. elsewhere, a 29.6 inch low should 
wobble northeastward from the central great lakes to southwestern 
quebec through monday. in response to the low's track, a warm front 
drifts northeastward across lake ontario tonight and then a cold 
front sweeps eastward across the lake overnight tonight through 
sunday. behind the cold front, a trough averaging 29.8 inches 
lingers over lake ontario through monday. on tuesday through 
wednesday, a ridge averaging 30.1 inches builds from the western and 
central great lakes. the ridge should begin to exit eastward on 
thursday and allow a warm front to sweep northeastward across lake 
ontario.


loz063>065-230300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sat aug 22 2026

.tonight...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 25 knots after midnight. showers with a
chance of thunderstorms. waves 1 to 3 feet building to 3 to
5 feet. 
.sunday...south winds 15 to 25 knots becoming west. a chance of
waterspouts. showers with a chance of thunderstorms in the
morning, then a chance of showers and thunderstorms early in the
afternoon. showers with a chance of thunderstorms late. waves
3 to 5 feet building to 3 to 6 feet. 
.sunday night...west winds 15 to 20 knots becoming southwest. a
chance of waterspouts. showers with a chance of thunderstorms in
the evening, then showers overnight. waves 3 to 6 feet building
to 4 to 7 feet. waves occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots. a chance of
waterspouts. showers. waves 5 to 8 feet building to 6 to 9 feet.
waves occasionally around 11 feet. 
.monday night...west winds 15 to 20 knots. a chance of
waterspouts. showers. waves 5 to 9 feet subsiding to 3 to 6 feet.
waves occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of waterspouts. showers during the day, then a
chance of showers tuesday night. waves 3 to 6 feet subsiding to
1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming south. waves
2 feet or less. 
.thursday...south winds 5 to 15 knots. a chance of showers during
the day, then showers likely thursday night. waves 2 feet or
less. 

winds and waves higher in and near thunderstorms.

$$