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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt thu may 21 2026


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
403 am edt thu may 21 2026

.today...north winds 5 to 15 knots diminishing to less than
10 knots. sunny.
.tonight...north winds less than 10 knots becoming east. mainly
clear. 
.friday...east winds 10 knots or less becoming northeast. sunny.
.friday night...northeast winds 10 knots or less becoming east.
partly cloudy in the evening, then becoming mostly cloudy. 
.saturday...east winds 5 to 10 knots becoming southeast. a chance
of showers during the day, then showers saturday night. 
.sunday...southeast winds 5 to 10 knots becoming south. showers
during the day, then a chance of showers sunday night. 
.monday...southwest winds less than 10 knots. a chance of showers
during the day. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt thu may 21 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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region through tonight, before 
sliding east off the new england coast late friday. this surface 
high will then strengthen to 30.6 inches as it anchors over atlantic 
canada through sunday. a 29.9 inch low and attendant warm front will 
then slowly approach the lake late friday night and saturday, before 
weakening and sliding eastward sunday. a 30.1 inch high will settle 
across the region monday through tuesday.


loz062-211500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt thu may 21 2026

.today...northeast winds 15 to 20 knots becoming east 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...east winds 10 knots or less. waves 1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...east winds 15 to 20 knots. a chance of showers
overnight. waves 2 to 4 feet. 
.saturday...east winds 15 to 25 knots. showers. waves 3 to 5 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 15 to 20 knots becoming southwest and
diminishing to 10 knots or less. showers likely during the day,
then a chance of showers sunday night. waves 3 to 5 feet
subsiding to 1 foot or less. 
.monday...north winds less than 10 knots. a chance of showers
during the day. waves 1 foot or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt thu may 21 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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region through tonight, before 
sliding east off the new england coast late friday. this surface 
high will then strengthen to 30.6 inches as it anchors over atlantic 
canada through sunday. a 29.9 inch low and attendant warm front will 
then slowly approach the lake late friday night and saturday, before 
weakening and sliding eastward sunday. a 30.1 inch high will settle 
across the region monday through tuesday.


loz063>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt thu may 21 2026

.today...northeast winds 15 to 20 knots diminishing to 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.tonight...north winds 5 to 10 knots becoming east. waves 1 foot
or less. 
.friday...east winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 15 to 25 knots becoming southeast.
showers. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots becoming south. showers.
waves 3 to 6 feet subsiding to 1 to 3 feet. 
.monday...south winds 10 knots or less becoming west. showers
likely during the day. waves 2 feet or less. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
351 am edt thu may 21 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...
high pressure 30.40 inches moves across the great lakes today 
before shifting into new england on friday. low pressure 30.00 
inches will lift northeast towards lake erie on friday night and
saturday, lifting a warm front onto the lake on saturday. a cold 
front will cross lake erie on sunday before high pressure 30.20 
inches builds overhead on monday.


lez061-169-211415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
351 am edt thu may 21 2026

.today...northeast winds 15 to 25 knots. waves 1 to 3 feet
building to 3 to 6 feet. 
.tonight...northeast winds 15 to 25 knots becoming east. waves
3 to 5 feet. 
.friday...east winds 15 to 25 knots becoming northeast. waves
3 to 6 feet. 
.friday night...east winds 15 to 20 knots. a chance of showers in
the evening, then showers overnight. waves 3 to 5 feet subsiding
to 1 to 3 feet. 
.saturday...east winds 15 to 25 knots becoming south. showers.
waves 2 to 4 feet. 
.sunday...south winds 5 to 15 knots diminishing to less than
10 knots. a chance of showers during the day, then showers likely
sunday night. waves 2 feet or less. 
.monday...west winds less than 10 knots. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$