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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 am edt sat apr 18 2026


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
404 am edt sat apr 18 2026

.today...southeast winds 5 to 15 knots becoming south 15 to
20 knots. sunny this morning, then becoming partly sunny. 
.tonight...south winds 15 to 20 knots becoming west 10 to
15 knots. rain showers. 
.sunday...west winds 5 to 15 knots. rain showers with snow
showers likely in the morning, then a chance of rain showers in
the afternoon. 
.sunday night...west winds 5 to 15 knots becoming northwest. a
chance of rain showers in the evening. 
.monday...northwest winds 10 knots or less becoming south. partly
cloudy, then becoming mainly clear. 
.tuesday...south winds 5 to 10 knots becoming southwest. a chance
of rain showers. 
.wednesday...northwest winds 10 knots or less becoming north.
mostly cloudy, then clearing. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt sat apr 18 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 30.0 inch high will push northeast across the 
canadian maritimes today. meanwhile, a 29.4 inch low north of lake 
superior this morning will move to james bay and deepen to 29.0 
inches during the day, while pushing a trailing strong cold front 
across the lake this afternoon and evening. a 30.4 inch high will 
then settle southeastward across the great lakes sunday through 
monday night, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing an attendant weak cold front 
across the lake tuesday night. a 30.2 inch high will then build 
across the great lakes region wednesday and thursday.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt sat apr 18 2026

.today...southeast winds 10 to 15 knots becoming southwest 15 to
20 knots. showers likely early this afternoon. 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...west winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers likely. waves 2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain and snow showers in the afternoon. waves 1 to
3 feet building to 2 to 4 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest. a
chance of rain showers in the evening. waves 3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of rain showers. waves 1 to 3 feet building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.wednesday...north winds 10 knots or less. waves 2 feet 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
403 am edt sat apr 18 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 30.0 inch high will push northeast across the 
canadian maritimes today. meanwhile, a 29.4 inch low north of lake 
superior this morning will move to james bay and deepen to 29.0 
inches during the day, while pushing a trailing strong cold front 
across the lake this afternoon and evening. a 30.4 inch high will 
then settle southeastward across the great lakes sunday through 
monday night, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing an attendant weak cold front 
across the lake tuesday night. a 30.2 inch high will then build 
across the great lakes region wednesday and thursday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt sat apr 18 2026

.today...southeast winds 15 to 20 knots becoming south. showers
likely late. waves 1 to 3 feet building to 3 to 5 feet. 
.tonight...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. rain showers with a chance of thunderstorms
early, then rain showers from late evening on. some thunderstorms
may produce gusty winds early. waves 3 to 5 feet subsiding to
2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
rain and snow showers likely in the morning, then a chance of
snow showers in the afternoon. waves 1 to 3 feet building to 3 to
6 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest.
waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 3 to 6 feet subsiding to 1 to
3 feet. 
.tuesday...south winds 10 to 15 knots becoming west. a chance of
rain showers. waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
336 am edt sat apr 18 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 29.40 inches will drag a cold front east through the
great lakes and ohio valley this evening. a trough averaging 
29.90 inches builds across the lake on sunday before high pressure
30.40 inches moves overhead sunday night into monday.


lez061-169-181415-
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-
336 am edt sat apr 18 2026

.today...south winds 15 to 20 knots becoming southwest. a slight
chance of showers late this morning. a chance of showers with a
slight chance of thunderstorms early this afternoon, then showers
with a chance of thunderstorms late. waves 1 to 3 feet building
to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of rain showers through the early overnight.
waves 2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain and snow showers in the afternoon. waves 2 to
4 feet. 
.sunday night...west winds 10 to 15 knots becoming northwest. a
chance of rain showers in the evening. waves 2 to 4 feet
subsiding to 1 to 2 feet. 
.monday...northwest winds 5 to 10 knots becoming south. waves
1 to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.wednesday...north winds 10 knots or less becoming northeast.
waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$