640
FZUS61 KBUF 310802
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
402 AM EDT Mon Aug 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 boundary will remain stalled near the lake
today through Tuesday before moving northeast across the lake
Tuesday night as a warm front. A 29.8 inch low will then move from
northwest Ontario province Tuesday night to western Quebec by
Wednesday night before reaching northern New England and the
Canadian Maritimes Thursday night. A trailing cold front will move
south across the lake Thursday.

LOZ062-311500-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
402 AM EDT Mon Aug 31 2026

.TODAY...Southeast winds 5 to 10 knots. Showers this morning,
then showers with a chance of thunderstorms this afternoon. Waves
1 foot or less.
.TONIGHT...Southeast winds 10 knots or less becoming southwest.
Showers with a chance of thunderstorms through the early
overnight, then a chance of showers and thunderstorms late. Waves
1 foot or less.
.TUESDAY...West winds 5 to 10 knots becoming east. A chance of
showers. Waves 1 foot or less.
.TUESDAY NIGHT...East winds 5 to 10 knots becoming south. A
chance of showers and thunderstorms in the evening, then showers
likely with a chance of thunderstorms overnight. Waves 1 foot or
less.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming west. Showers
likely with a chance of thunderstorms. Waves 2 feet or less.
.THURSDAY...West winds 5 to 10 knots becoming northwest. A chance
of showers during the day. Waves 1 foot or less.
.FRIDAY...Northwest winds 10 knots or less becoming north. Waves
1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ063>065-311500-
Lake Ontario open waters from Hamlin Beach to the Saint Lawrence
River-
402 AM EDT Mon Aug 31 2026

.TODAY...Southeast winds 5 to 15 knots. Patchy fog early. A
chance of showers late this morning. Showers with a chance of
thunderstorms this afternoon. Waves 2 feet or less.
.TONIGHT...Southeast winds 10 knots or less becoming south.
Showers with a chance of thunderstorms. Waves 1 foot or less.
.TUESDAY...Southwest winds 10 knots or less becoming north.
Showers likely in the morning, then a chance of showers in the
afternoon. Waves 1 foot or less.
.TUESDAY NIGHT...East winds 10 knots or less becoming south.
Showers likely with a chance of thunderstorms overnight. Waves
1 foot or less.
.WEDNESDAY...South winds 5 to 15 knots becoming west. Showers
likely with a chance of thunderstorms. Waves 1 to 3 feet.
.THURSDAY...West winds 5 to 10 knots becoming northwest. A chance
of showers during the day. Waves 2 feet or less.
.FRIDAY...Northwest winds 5 to 10 knots becoming north. Waves
2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-311500-
MAFOR 3109/
ONTARIO WEST 1/2 11300 11306 11316 13306 11406 11500. A chance of
thunderstorms this afternoon and tonight. Waves 2 feet or less.

ONTARIO EAST 1/2 11400 12300 12306 13406. A chance of
thunderstorms this afternoon and tonight. Waves 2 feet or less.

$$