Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. Read More >

Lake Erie

The reported Lake Erie water temperature is taken at the Buffalo Water Treatment Plant located on Lake Erie at the entrance to the Niagara River. The reading is taken at a depth of 30 feet. This data is unofficial.

Lake Ontario

The reported Lake Ontario water temperature is taken at the Monroe County Water Treatment Plant near Greece, N.Y. The temperatures is measured at the intake pipes about 1500 feet offshore at a approximate depth of 35 feet. The Lake Ontario temperature occasionally may not be representative of the surface temperature due to upwelling. This process, more common during the summer months, brings colder water from the deeper parts of the lake toward the surface near the temperature sensor. The surface water may be significantly warmer. This data is unofficial.

Latest Lake Temperatures

1004 AM EDT Sat Aug 9 2025 The water temperature off Buffalo is 76 degrees.

1004 AM EDT Sat Aug 9 2025 The water temperature off Rochester is 47 degrees.

Monthly Lake Erie Temperatures
January	February	March	April	May	June	July	August	September	October	November	December

Historical Lake Erie Temperatures (Unofficial Normals and Extremes)

The daily lake temperatures for Lake Erie off Buffalo and for Lake Ontario off Rochester are included in the Nearshore Marine Forecast.

Click the link for previous versions of the Nearshore Marine Forecast.

NearShore Marine Forecast

577
FZUS51 KBUF 092004
NSHBUF

Nearshore Marine Forecast
National Weather Service Buffalo NY
403 PM EDT Sat Aug 9 2025

For waters within five nautical miles of shore

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.

LEZ020-100300-
Upper Niagara River and Buffalo Harbor-
403 PM EDT Sat Aug 9 2025

.TONIGHT...Southwest winds 10 knots or less becoming south.
Becoming mainly clear.
.SUNDAY...South winds 5 to 10 knots becoming southwest. Sunny.
.SUNDAY NIGHT...Southwest winds less than 10 knots. Mainly clear.
.MONDAY...South winds 5 to 10 knots becoming southwest. Sunny.
.MONDAY NIGHT...Southwest winds less than 10 knots becoming
south. Mainly clear.
.TUESDAY...Southwest winds 5 to 10 knots. A chance of showers and
thunderstorms Tuesday night.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming light and
variable. A chance of showers and thunderstorms.
.THURSDAY...North winds less than 10 knots. Partly cloudy.

Winds and waves higher in and near thunderstorms.

The water temperature off Buffalo is 76 degrees.

$$

LOZ030-100300-
Lower Niagara River-
403 PM EDT Sat Aug 9 2025

.TONIGHT...Southwest winds 10 knots or less becoming south.
Becoming mainly clear.
.SUNDAY...South winds 5 to 10 knots. Sunny.
.SUNDAY NIGHT...Southwest winds 10 knots or less becoming south.
Mainly clear.
.MONDAY...South winds 5 to 10 knots becoming southwest. Sunny.
.MONDAY NIGHT...Southwest winds 10 knots or less becoming south.
Mainly clear.
.TUESDAY...Southwest winds 5 to 10 knots. A chance of showers
during the day, then a chance of showers and thunderstorms
Tuesday night.
.WEDNESDAY...Southwest winds 10 knots or less becoming north. A
chance of showers and thunderstorms during the day, then a chance
of showers Wednesday night.
.THURSDAY...North winds 10 knots or less becoming east. Partly
cloudy.

Winds and waves higher in and near thunderstorms.

$$

LEZ041-100300-
Dunkirk to Buffalo along Lake Erie-
403 PM EDT Sat Aug 9 2025

.TONIGHT...West winds 10 knots or less becoming south. Mainly
clear. Waves 1 foot or less.
.SUNDAY...South winds 10 knots or less becoming west. Sunny.
Waves 1 foot or less.
.SUNDAY NIGHT...Southwest winds 10 knots or less becoming south.
Mainly clear. Waves 1 foot or less.
.MONDAY...South winds 10 knots or less becoming southwest. Sunny.
Waves 1 foot or less.
.MONDAY NIGHT...Southwest winds 10 knots or less becoming south.
Mainly clear. Waves 1 foot or less.
.TUESDAY...Southwest winds 5 to 10 knots. A chance of showers and
thunderstorms Tuesday night. Waves 1 foot or less.
.WEDNESDAY...Southwest winds 10 knots or less becoming northwest.
A chance of showers and thunderstorms. Waves 1 foot or less.
.THURSDAY...Northeast winds less than 10 knots becoming
southeast. Partly cloudy. Waves 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LEZ040-100300-
Ripley to Dunkirk along Lake Erie-
403 PM EDT Sat Aug 9 2025

.TONIGHT...East winds 10 knots or less becoming south. Mainly
clear. Waves 1 foot or less.
.SUNDAY...South winds around 10 knots becoming light and
variable. Sunny. Waves 1 foot or less.
.SUNDAY NIGHT...Light and variable winds becoming south around
10 knots. Mainly clear. Waves 1 foot or less.
.MONDAY...South winds 10 knots or less becoming west. Sunny.
Waves 1 foot or less.
.MONDAY NIGHT...Light and variable winds becoming south 5 to
10 knots. Mainly clear. Waves 1 foot or less.
.TUESDAY...South winds 5 to 10 knots becoming southwest. A chance
of showers and thunderstorms Tuesday night. Waves 1 foot or less.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming northwest. A
chance of showers and thunderstorms during the day, then a chance
of showers Wednesday night. Waves 1 foot or less.
.THURSDAY...Northeast winds 10 knots or less becoming southeast.
Partly cloudy. Waves 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ042-100300-
Niagara River to Hamlin Beach along Lake Ontario-
403 PM EDT Sat Aug 9 2025

.TONIGHT...East winds 5 to 10 knots becoming south. Becoming
mainly clear. Waves 1 foot or less.
.SUNDAY...Southwest winds 5 to 10 knots becoming east. Sunny.
Waves 1 foot or less.
.SUNDAY NIGHT...East winds 10 knots or less becoming south.
Mainly clear. Waves 1 foot or less.
.MONDAY...Southwest winds 5 to 10 knots becoming southeast.
Sunny. Waves 1 foot or less.
.MONDAY NIGHT...South winds 5 to 10 knots becoming southwest.
Mainly clear. Waves 1 foot or less.
.TUESDAY...Southwest winds 5 to 10 knots. A chance of showers and
thunderstorms Tuesday night. Waves 1 foot or less.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming northwest. A
chance of showers and thunderstorms during the day, then a chance
of showers Wednesday night. Waves 1 foot or less.
.THURSDAY...North winds 5 to 10 knots becoming east. Partly
cloudy. Waves 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ043-044-100300-
Hamlin Beach to Mexico Bay along Lake Ontario
including Irondequoit Bay-
403 PM EDT Sat Aug 9 2025

.TONIGHT...East winds 5 to 10 knots becoming south. Becoming
mainly clear. Waves 1 foot or less.
.SUNDAY...South winds 5 to 10 knots becoming northeast. Sunny.
Waves 1 foot or less.
.SUNDAY NIGHT...East winds 5 to 10 knots becoming south. Mainly
clear. Waves 1 foot or less.
.MONDAY...South winds 10 knots or less becoming east. Sunny.
Waves 1 foot or less.
.MONDAY NIGHT...Southeast winds 10 knots or less becoming south.
Mainly clear. Waves 1 foot or less.
.TUESDAY...South winds 10 knots or less becoming southwest. A
chance of showers Tuesday night. Waves 1 foot or less.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming northwest. A
chance of showers and thunderstorms. Waves 1 foot or less.
.THURSDAY...North winds 10 knots or less becoming southeast.
Partly cloudy. Waves 1 foot or less.

Winds and waves higher in and near thunderstorms.

The water temperature off Rochester is 47 degrees.

$$

LOZ045-100300-
Mexico Bay to the Saint Lawrence River along Lake Ontario-
403 PM EDT Sat Aug 9 2025

.TONIGHT...West winds 5 to 15 knots becoming south. Partly
cloudy. Waves 2 feet or less.
.SUNDAY...South winds 5 to 15 knots becoming southwest. Sunny.
Waves 2 feet or less.
.SUNDAY NIGHT...South winds less than 10 knots increasing to
10 to 15 knots. Mainly clear. Waves 2 feet or less.
.MONDAY...South winds 5 to 10 knots becoming southwest. Sunny.
Waves 2 feet or less.
.MONDAY NIGHT...South winds 10 knots or less. Mainly clear. Waves
1 foot or less.
.TUESDAY...South winds 5 to 10 knots. A chance of showers and
thunderstorms Tuesday night. Waves 1 foot or less.
.WEDNESDAY...Southwest winds 5 to 10 knots becoming northwest. A
chance of showers and thunderstorms. Waves 1 foot or less.
.THURSDAY...North winds 5 to 10 knots becoming east. Partly
cloudy. Waves 1 foot or less.

Winds and waves higher in and near thunderstorms.

$$

Radar