Ontonagon water temp

This data the coastal Ontonagon water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current water temperature in Ontonagon

Water temperature in Ontonagon today is 60.4°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Ontonagon was recorded in 2024 and was 65.3°F, and the coldest was recorded in 2014 at 53.2°F. Water temperature in Ontonagon is expected to drop to 56.7°F in the next 10 days. September average water temperature in Ontonagon is 61.3°F, the minimum temperature is 49.8°F, and the maximum is 70°F.

The swimming season in Ontonagon lasts only one month - August. During this month, Ontonagon water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Ontonagon in winter reaches 36°F, in spring 35.8°F, in summer the average temperature rises to 57.4°F, and in autumn it is 52.9°F.

Ontonagon water temperature now

Surf Forecast in Ontonagon for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Ontonagon. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Ontonagon. Data in table shown for September 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Ontonagon

Ontonagon weather forecast

Current temperature and weather

Data in a table show Ontonagon temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Ontonagon.

0-3 h	3-6 h	6-9 h	9-12 h
53.4°F	51.6°F	50.7°F	52.2°F

12-15 h	15-18 h	18-21 h	21-24 h
60.8°F	69.3°F	71.4°F	67.5°F

Ontonagon water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Ontonagon. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Ontonagon on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Ontonagon

The nearest beaches and cities from Ontonagon with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
McLain State Park	61°F	66.2°F		1' 7"
Calumet	60.6°F	64.4°F		1' 7"
Keweenaw Bay	61.9°F	62.6°F		0' 11"
Apostle Islands	60.4°F	60.8°F		1' 3"
Eagle River	61.2°F	62.6°F		1' 5"
Madeline Island	63.1°F	62.6°F		1' 1"
Big Bay State Park	63.1°F	62.6°F		1' 1"
Washburn	63°F	66.2°F		1' 0"
Bayfield	64°F	62.6°F		1' 0"
Eagle Harbor	60.4°F	51.8°F		1' 5"

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Our report for Ontonagon is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.