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


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

.today...south winds 10 knots or less becoming southwest. patchy
fog early. 
.tonight...southwest winds 10 knots or less. mostly cloudy. 
.thursday...southwest winds 5 to 15 knots. showers likely in the
afternoon. 
.thursday night...southwest winds 10 knots or less. showers.
.friday...west winds less than 10 knots becoming northwest.
showers during the day, then a chance of showers friday night. 
.saturday...north winds less than 10 knots. mainly clear. 
.sunday...southeast winds 10 knots or less becoming west. a
chance of rain showers sunday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed sep 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 29.9 inch will shift east into the canadian maritimes 
today, while a 30.1 inch high builds just off the mid atlantic 
coast. a warm front will lift across the lake thursday, followed by 
a cold front crossing the lower great lakes later thursday night and 
friday morning. a 30.3 inch high is then forecast to build into the 
western great lakes friday night and over the eastern great lakes by 
saturday, before exiting into northern new england sunday. 
meanwhile, a cold front will then cross the eastern great lakes 
sunday night, with another 30.3 inch high building from the western 
great lakes into the eastern great lakes on monday.


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

.today...southwest winds 5 to 10 knots becoming south. waves
2 feet or less. 
.tonight...south winds 5 to 15 knots becoming southwest. a chance
of showers after midnight. waves 2 feet or less. 
.thursday...southwest winds 10 to 15 knots. a chance of showers.
waves 1 to 3 feet. 
.thursday night...southwest winds 10 to 15 knots becoming west.
showers. waves 1 to 3 feet. 
.friday...northwest winds 10 to 15 knots. showers during the day.
waves 1 to 3 feet. 
.saturday...north winds 10 knots or less becoming southeast.
waves 2 feet or less. 
.sunday...south winds 5 to 10 knots becoming northwest and
increasing to 15 to 20 knots. waves 1 foot or less building to
3 to 5 feet. 

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed sep 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 29.9 inch will shift east into the canadian maritimes 
today, while a 30.1 inch high builds just off the mid atlantic 
coast. a warm front will lift across the lake thursday, followed by 
a cold front crossing the lower great lakes later thursday night and 
friday morning. a 30.3 inch high is then forecast to build into the 
western great lakes friday night and over the eastern great lakes by 
saturday, before exiting into northern new england sunday. 
meanwhile, a cold front will then cross the eastern great lakes 
sunday night, with another 30.3 inch high building from the western 
great lakes into the eastern great lakes on monday.


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

.today...south winds 5 to 10 knots becoming southeast. waves
2 feet or less. 
.tonight...south winds 5 to 15 knots becoming southwest. a chance
of showers late. waves 2 feet or less. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers. waves 1 to 3 feet building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.thursday night...southwest winds 10 to 15 knots. showers. waves
1 to 3 feet. 
.friday...west winds 10 to 15 knots becoming north 15 to
20 knots. showers during the day, then a chance of showers friday
night. waves 1 to 2 feet building to 2 to 4 feet. 
.saturday...north winds 5 to 15 knots becoming southeast 10 knots
or less. waves 1 to 3 feet subsiding to 1 foot or less. 
.sunday...south winds 10 to 15 knots becoming west and increasing
to 15 to 25 knots. a chance of showers sunday night. waves 1 to
3 feet building to 3 to 6 feet. 

$$