Isle Royale water temp

This data the coastal Isle Royale 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 Isle Royale

Water temperature in Isle Royale today is 56.8°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Isle Royale was recorded in 2016 and was 64.8°F, and the coldest was recorded in 2014 at 48.7°F. Water temperature in Isle Royale is expected to be constant 56.8°F in the next 10 days. September average water temperature in Isle Royale is 58.3°F, the minimum temperature is 47.3°F, and the maximum is 67.3°F.

Throughout the year, the water temperature in Isle Royale does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Isle Royale in winter reaches 36.9°F, in spring 35.1°F, in summer the average temperature rises to 49.5°F, and in autumn it is 50.9°F.

Isle Royale water temperature now

Surf Forecast in Isle Royale 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 Isle Royale. 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 Isle Royale. Data in table shown for September 14, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Isle Royale

Isle Royale weather forecast

Current temperature and weather

Data in a table show Isle Royale temperature today (September 14, 2025). For more information and forecast for a few days, go to the weather forecast Isle Royale.

0-3 h	3-6 h	6-9 h	9-12 h
57.6°F	56.8°F	56.3°F	56.3°F

12-15 h	15-18 h	18-21 h	21-24 h
56.7°F	57.4°F	57.4°F	56.7°F

Isle Royale water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Isle Royale. 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 Isle Royale 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 Isle Royale

The nearest beaches and cities from Isle Royale 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
Ontonagon	61°F	71.6°F		0' 7"
Grand Marais	56.5°F	59°F		1' 0"
Baraga	60.3°F	73.4°F		0' 6"
Lutsen	57.2°F	57.2°F		0' 10"
Tofte	56.7°F	59°F		1' 1"
Schroeder	56.5°F	59°F		1' 1"
Apostle Islands	60.6°F	57.2°F		1' 1"
Harvey	59.4°F	68°F		0' 2"
Marquette	59.4°F	68°F		0' 2"
Madeline Island	60.8°F	62.6°F		0' 9"

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Isle Royale National Park

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Our report for Isle Royale 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.