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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
408 am edt tue mar 31 2026


slz022-024-311500-
saint lawrence river from cape vincent to saint regis
408 am edt tue mar 31 2026

.today...northeast winds 5 to 15 knots. rain showers with a
chance of thunderstorms this morning, then a chance of rain
showers early this afternoon. rain showers likely late. 
.tonight...northeast winds 5 to 10 knots. rain showers with a
chance of thunderstorms in the evening, then rain showers likely
after midnight. a chance of rain showers late. 
.wednesday...north winds 5 to 10 knots. mostly cloudy. 
.wednesday night...northeast winds 5 to 10 knots. mostly cloudy. 
.thursday...northeast winds 5 to 15 knots becoming southeast
15 to 20 knots. rain and snow showers with freezing rain likely
during the day, then rain showers thursday night. 
.friday...south winds 15 to 20 knots becoming northwest 5 to
15 knots. rain showers during the day, then a chance of rain
showers friday night. 
.saturday...northeast winds 5 to 15 knots becoming south. a
chance of rain showers during the day, then rain showers saturday
night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
407 am edt tue mar 31 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 zone will stall near the south shore of the 
lake today. a 29.6 inch low will move across southern ontario 
province this evening before reaching the canadian maritimes 
wednesday, with a trailing cold front moving south across the lake 
tonight. a 30.6 inch high will then build east across ontario and 
quebec wednesday through thursday. a 29.6 inch low is then forecast 
to move into the central great lakes thursday night before reaching 
southern quebec late friday.


loz062-311500-
lake ontario open waters from the niagara river to hamlin beach-
407 am edt tue mar 31 2026

.today...southwest winds 10 to 15 knots becoming east 15 to
20 knots. patchy fog early. rain showers with a chance of
thunderstorms early, then a chance of rain showers. rain showers
with a chance of thunderstorms late. some thunderstorms may
produce gusty winds late. waves 1 to 3 feet building to 2 to
4 feet. 
.tonight...east winds 15 to 20 knots becoming north 10 to
15 knots. rain showers with a chance of thunderstorms in the
evening, then rain showers likely after midnight. a chance of
rain showers late. some thunderstorms may produce gusty winds
early. waves 2 to 4 feet. 
.wednesday...north winds 5 to 15 knots becoming northeast. a
chance of rain showers. waves 1 to 3 feet. 
.wednesday night...east winds 5 to 15 knots becoming northeast
15 to 20 knots. a chance of rain showers. waves 2 feet or less
building to 3 to 5 feet. 
.thursday...east winds 15 to 25 knots becoming south. rain
showers likely. waves 4 to 7 feet subsiding to 3 to 5 feet. waves
occasionally around 9 feet. 
.friday...southwest winds 15 to 25 knots becoming north and
diminishing to 10 to 15 knots. showers likely during the day,
then a chance of showers friday night. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.saturday...northeast winds 10 to 15 knots becoming southwest
15 to 20 knots. a chance of showers during the day, then showers
likely saturday night. waves 1 to 3 feet building to 3 to 5 feet.

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
407 am edt tue mar 31 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 zone will stall near the south shore of the 
lake today. a 29.6 inch low will move across southern ontario 
province this evening before reaching the canadian maritimes 
wednesday, with a trailing cold front moving south across the lake 
tonight. a 30.6 inch high will then build east across ontario and 
quebec wednesday through thursday. a 29.6 inch low is then forecast 
to move into the central great lakes thursday night before reaching 
southern quebec late friday.


loz063>065-311500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
407 am edt tue mar 31 2026

.today...southwest winds 10 to 15 knots becoming northeast.
patchy fog this morning. rain showers with a chance of
thunderstorms this morning, then a chance of rain showers early
this afternoon. rain showers with a chance of thunderstorms late.
waves 2 feet or less. 
.tonight...east winds 10 to 15 knots becoming north. rain showers
with a chance of thunderstorms in the evening, then rain showers
likely with a chance of thunderstorms after midnight. a chance of
rain showers late. waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots becoming northeast. a
chance of rain showers. waves 1 to 3 feet. 
.wednesday night...northeast winds 5 to 15 knots increasing to
15 to 20 knots. a chance of rain showers. waves 1 to 3 feet
building to 2 to 4 feet. 
.thursday...northeast winds 15 to 25 knots becoming south to
30 knots. rain showers likely. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.friday...south winds to 30 knots becoming northwest and
diminishing to 10 to 15 knots. showers likely during the day,
then a chance of showers friday night. waves 4 to 7 feet
subsiding to 2 to 4 feet. waves occasionally around 9 feet. 
.saturday...northeast winds 5 to 15 knots becoming south and
increasing to 15 to 25 knots. a chance of rain showers during the
day, then rain showers likely saturday night. waves 1 to 3 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
412 am edt tue mar 31 2026

for waters beyond five nautical miles of shore on lake erie

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...
low pressure 29.70 inches will move east through the great lakes 
today and extend a cold front southeast across the lake by
wednesday morning. the front will lift north as a warm front on
wednesday night. a low pressure system 29.50 inches will develop
over the central united states and move east into the great lakes
region for thursday, extending a cold front across the lake on
friday. low pressure 29.70 inches will target the great lakes
region for saturday.


lez061-168-169-311430-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
412 am edt tue mar 31 2026

.today...southwest winds 15 to 20 knots. a chance of showers and
thunderstorms through early afternoon, then showers likely with a
chance of thunderstorms late. waves 3 to 5 feet subsiding to 2 to
4 feet. 
.tonight...southwest winds 15 to 20 knots becoming west 10 to
15 knots. rain showers with a chance of thunderstorms in the
evening, then rain showers with a slight chance of thunderstorms
after midnight. rain showers likely late. waves 3 to 5 feet. 
.wednesday...north winds around 10 knots becoming northeast. a
chance of rain showers. waves 1 to 3 feet. 
.wednesday night...northeast winds 10 to 15 knots increasing to
15 to 20 knots. a chance of rain showers. waves 1 to 3 feet
building to 2 to 4 feet. 
.thursday...northeast winds 15 to 20 knots becoming south. rain
showers likely. waves 2 to 4 feet. 
.friday...southwest winds 15 to 20 knots becoming east and
diminishing to 5 to 10 knots. a chance of showers during the day,
then a chance of rain friday night. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.saturday...east winds 5 to 15 knots becoming southwest 15 to
20 knots. rain likely with a chance of thunderstorms during the
day, then rain likely saturday night. waves 1 to 2 feet building
to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$