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Ontonagon water temp

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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 62.8°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 2012 and was 69.6°F, and the coldest was recorded in 2017 at 61.3°F. Water temperature in Ontonagon is expected to drop to 61.3°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


September 5, 2025
today temp
62.8°F
September 4, 2025
yesterday temp
63.3°F


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 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

0-3 h3-6 h6-9 h9-12 h
2' 5"2' 0"1' 5"1' 10"
0.74 m0.6 m0.42 m0.57 m
12-15 h15-18 h18-21 h21-24 h
3' 7"4' 8"5' 4"5' 6"
1.08 m1.41 m1.62 m1.67 m

Surf report in Ontonagon

Ontonagon wave height and direction

Ontonagon weather forecast

Ontonagon wind speed and direction

Current temperature and weather

Data in a table show Ontonagon temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Ontonagon.

0-3 h3-6 h6-9 h9-12 h
48°F47.3°F51.1°F49.6°F
12-15 h15-18 h18-21 h21-24 h
49.5°F51.1°F51.6°F52.5°F

You may also be interested in other sections of our site for Ontonagon: Sunrise and Sunset, Tides

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

MonthAvrMinMax
January35.4°F31.1°F39.9°Fcold
Water temperature in Ontonagon in January
February33.4°F31.1°F36°Fcold
Water temperature in Ontonagon in February
March33.3°F31.1°F37.8°Fcold
Water temperature in Ontonagon in March
April34.9°F30.9°F40.1°Fcold
Water temperature in Ontonagon in April
May39.2°F33.1°F48.7°Fcold
Water temperature in Ontonagon in May
June46.9°F37.9°F64°Fcold
Water temperature in Ontonagon in June
July59.5°F44.1°F70.2°Fcold
Water temperature in Ontonagon in July
August65.5°F55.9°F71.4°Fcold
Water temperature in Ontonagon in August
September61.3°F49.8°F70°Fcold
Water temperature in Ontonagon in September
October52.5°F45.3°F63°Fcold
Water temperature in Ontonagon in October
November45°F39.6°F51.8°Fcold
Water temperature in Ontonagon in November
December39°F32.4°F43.7°Fcold
Water temperature in Ontonagon in December

Chart monthly average water temperature in Ontonagon

Water temperature in Ontonagon

Where is the warmest sea water in the world?

If you want to plan a vacation on the beach and enjoy the warm sea, choose the day of the year, region and the minimum comfortable sea/ocean temperature that interests you. As a result, you will get a list of countries and cities in which the average sea temperature or maximum temperature on this day over the past 10 years exceeds your chosen value

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Nearby beaches and cities

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

WaterWeatherWave
McLain State Park61.9°F50°F3' 9"
Calumet61.7°F50°F3' 8"
Keweenaw Bay61°F50°F1' 3"
Apostle Islands63.7°F53.6°F2' 8"
Eagle River61.9°F50°F3' 3"
Madeline Island64.8°F55.4°F1' 8"
Big Bay State Park64.8°F55.4°F1' 8"
Washburn64.9°F51.8°F1' 5"
Bayfield65.3°F55.4°F1' 5"
Eagle Harbor61.2°F50°F3' 3"

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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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.

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