CNYWeather.com - Marine Forecast

Nearshore Marine Zone Forecast

Select a Lake Ontario nearshore zone (within 5 NM of shore).

Source: NWS Buffalo — Mexico Bay to St. Lawrence River (LOZ045)
Last updated: 2026-09-20 10:54 AM EDT (live fetch)
NWS issued: 1003 AM EDT Sun Sep 20 2026

Today

Northeast winds 5 to 10 knots. A chance of showers late this morning. Waves 1 foot or less.
Tonight

Northeast winds 5 to 15 knots increasing to 15 to 20 knots. Mostly cloudy. Waves 2 feet or less.
Monday

Northeast winds 15 to 20 knots diminishing to 10 to 15 knots. Partly sunny. Waves 1 to 3 feet.
Monday Night

Northeast winds 15 to 20 knots. Mostly cloudy. Waves 2 feet or less.
Tuesday

Northeast winds 15 to 20 knots becoming east 10 to 15 knots. Mostly cloudy. Waves 2 feet or less.
Wednesday

East winds 5 to 15 knots. Partly cloudy. Waves 1 foot or less.
Thursday

East winds 5 to 15 knots becoming northeast. Partly to mostly cloudy. Waves 1 foot or less.

Open Lake Forecast (beyond 5 NM of shore)

Source: NWS Buffalo open lake forecast for Lake Ontario
Last updated: 2026-09-20 10:54 AM EDT (live fetch)

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
1002 AM EDT Sun Sep 20 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...
An 29.9 inch inverted trough draped from the Ohio Valley to New York 
State will drift southeastward and away from the lake this afternoon 
and tonight as a 30.4 inch high builds southeastward across Ontario 
Province. This high will then strengthen to 30.6 inches as it slowly 
drifts across Quebec through Thursday.

LOZ062-202100-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
1002 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 5 to 15 knots. Waves 1 to
3 feet. 
.TONIGHT...Northeast winds 5 to 10 knots increasing to 15 to
20 knots. Waves 1 to 2 feet building to 4 to 6 feet. 
.MONDAY...Northeast winds 15 to 20 knots diminishing to 10 to
15 knots. Waves 3 to 6 feet subsiding to 2 to 4 feet. 
.MONDAY NIGHT...Northeast winds 15 to 20 knots. Waves 3 to
6 feet. 
.TUESDAY...Northeast winds 15 to 25 knots becoming east. Waves
4 to 7 feet. Waves occasionally around 9 feet. 
.WEDNESDAY...East winds 15 to 20 knots. Waves 3 to 6 feet. 
.THURSDAY...East winds 15 to 20 knots becoming northeast 10 to
15 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet. 

$$

LOZ063>065-202100-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
1002 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 10 to 15 knots. A chance of
showers late this morning. Waves 1 to 3 feet. 
.TONIGHT...Northeast winds 10 to 15 knots increasing to 15 to
20 knots. Waves 1 to 3 feet building to 3 to 6 feet. 
.MONDAY...Northeast winds 15 to 25 knots. Waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.MONDAY NIGHT...Northeast winds 15 to 20 knots. Waves 2 to 4 feet
building to 3 to 6 feet. 
.TUESDAY...East winds 15 to 20 knots. Waves 3 to 6 feet. 
.WEDNESDAY...East winds 15 to 20 knots. Waves 3 to 5 feet. 
.THURSDAY...East winds 15 to 20 knots becoming northeast 10 to
15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$

LOZ061-202100-
MAFOR 2015/
ONTARIO WEST 1/2 12110 12100 14120. Waves 1 to 3 feet this
afternoon. Waves 1 to 2 feet building to 4 to 6 feet tonight.
Waves 4 to 6 feet Monday morning. 

ONTARIO EAST 1/2 14110 12120 11130 11120. Waves 1 to 3 feet this
afternoon. Waves 1 to 3 feet building to 3 to 6 feet tonight.
Waves 3 to 6 feet Monday morning. 

$$

Marine Forecasts