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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 am edt thu apr 16 2026


slz022-024-161500-
saint lawrence river from cape vincent to saint regis
410 am edt thu apr 16 2026

.today...east winds 10 knots or less becoming southwest. patchy
fog this morning. showers late this morning. showers with a
chance of thunderstorms this afternoon. 
.tonight...southwest winds 10 knots or less becoming north.
showers likely with a chance of thunderstorms early, then showers
likely late in the evening. a chance of showers after midnight.
patchy fog from late evening on. 
.friday...north winds less than 10 knots. a chance of showers in
the morning. 
.friday night...light and variable winds. mainly clear in the
evening, then becoming partly cloudy. 
.saturday...southeast winds 10 to 15 knots becoming southwest. a
chance of showers during the day, then showers saturday night. 
.sunday...west winds 5 to 15 knots. rain showers likely during
the day, then a chance of rain showers sunday night. 
.monday...northwest winds 5 to 10 knots becoming west. partly
cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am edt thu apr 16 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 29.6 inch low will move across the central great lakes 
today before reaching southern quebec tonight, then drift off the 
new england coast by friday night. a 30.0 inch high is then forecast 
to build from the central great lakes friday to the lower great 
lakes saturday morning, then off the east coast saturday night. a 
29.3 inch surface low to the north of lake superior saturday will 
deepen to 28.9 inches by sunday, with a trailing cold front crossing 
the lake saturday night. a 30.4 inch surface high will push from the 
plains to the upper ohio valley from sunday through monday. the high 
is expected to move off the mid-atlantic coast tuesday.


loz062-161500-
lake ontario open waters from the niagara river to hamlin beach-
409 am edt thu apr 16 2026

.today...southwest winds 10 to 15 knots increasing to 15 to
20 knots. patchy fog this morning. a chance of showers early,
then showers likely late this morning. showers with a chance of
thunderstorms this afternoon. waves 1 to 3 feet building to 2 to
4 feet. 
.tonight...southwest winds 15 to 20 knots becoming northwest and
diminishing to 5 to 10 knots. showers likely with a chance of
thunderstorms early, then a chance of showers. patchy fog from
late evening on. waves 2 to 4 feet subsiding to 1 to 2 feet. 
.friday...northwest winds 10 knots or less becoming south. patchy
fog in the morning. waves 1 foot or less. 
.friday night...southeast winds 10 knots or less becoming east.
waves 1 foot or less. 
.saturday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. showers. waves 2 feet or less building to 2 to 4 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. a chance
of rain showers. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.monday...northwest winds 15 to 25 knots becoming southwest and
diminishing to 10 to 15 knots. waves 4 to 7 feet subsiding to
1 to 3 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am edt thu apr 16 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 29.6 inch low will move across the central great lakes 
today before reaching southern quebec tonight, then drift off the 
new england coast by friday night. a 30.0 inch high is then forecast 
to build from the central great lakes friday to the lower great 
lakes saturday morning, then off the east coast saturday night. a 
29.3 inch surface low to the north of lake superior saturday will 
deepen to 28.9 inches by sunday, with a trailing cold front crossing 
the lake saturday night. a 30.4 inch surface high will push from the 
plains to the upper ohio valley from sunday through monday. the high 
is expected to move off the mid-atlantic coast tuesday.


loz063>065-161500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 am edt thu apr 16 2026

.today...southwest winds 5 to 15 knots. patchy dense fog this
morning. a chance of showers early, then showers late this
morning. showers with a chance of thunderstorms this afternoon.
some thunderstorms may produce gusty winds late. waves 1 to
3 feet. 
.tonight...southwest winds 5 to 15 knots becoming northwest.
showers with a chance of thunderstorms early, then showers likely
late in the evening. a chance of showers after midnight. patchy
fog from late evening on. some thunderstorms may produce gusty
winds early. waves 1 to 3 feet. 
.friday...northwest winds 10 knots or less becoming west. patchy
fog in the morning. waves 2 feet or less. 
.friday night...southwest winds 10 knots or less becoming
southeast. waves 1 foot or less. 
.saturday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. showers likely. waves 1 to 3 feet building to 3 to
5 feet. 
.sunday...west winds 15 to 25 knots becoming northwest to
30 knots. rain showers likely during the day, then a chance of
rain showers sunday night. waves 3 to 6 feet building to 5 to
9 feet. waves occasionally around 11 feet. 
.monday...northwest winds 15 to 25 knots becoming west. waves
5 to 9 feet subsiding to 3 to 5 feet. waves occasionally around
11 feet. 

winds and waves higher in and near thunderstorms.

$$