This data the coastal Apostle Islands 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.
Water temperature in Apostle Islands today is 60.3°F. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Superior near Apostle Islands was recorded in 2024 and was 64.4°F, and the coldest was recorded in 2019 at 54.3°F. Water temperature in Apostle Islands is expected to drop to 57°F in the next 10 days. September average water temperature in Apostle Islands is 61°F, the minimum temperature is 52.7°F, and the maximum is 70.2°F.
The swimming season in Apostle Islands lasts only one month - August. During this month, Apostle Islands water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Apostle Islands in winter reaches 35.2°F, in spring 36.1°F, in summer the average temperature rises to 58.6°F, and in autumn it is 52.5°F.
September 22, 2025 |
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today temp |
60.3°F |
September 21, 2025 |
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yesterday temp |
62.6°F |
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 Apostle Islands. 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 Apostle Islands. Data in table shown for September 22, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
0' 6" | 0' 5" | 0' 4" | 0' 3" |
0.14 m | 0.12 m | 0.1 m | 0.08 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
0' 3" | 0' 3" | 0' 6" | 0' 6" |
0.08 m | 0.08 m | 0.14 m | 0.16 m |
Data in a table show Apostle Islands temperature today (September 22, 2025). For more information and forecast for a few days, go to the weather forecast Apostle Islands.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
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59°F | 58.1°F | 57.4°F | 57.4°F |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
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57.2°F | 57°F | 57.4°F | 56.5°F |
You may also be interested in other sections of our site for Apostle Islands: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly water temperature in Apostle Islands. 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 Apostle Islands 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
Month | Avr | Min | Max | |
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January | 34.5°F | 30.7°F | 39.9°F | cold |
Water temperature in Apostle Islands in January | ||||
February | 32.9°F | 30.6°F | 35.2°F | cold |
Water temperature in Apostle Islands in February | ||||
March | 33.4°F | 31.1°F | 39.4°F | cold |
Water temperature in Apostle Islands in March | ||||
April | 35.2°F | 31.5°F | 40.3°F | cold |
Water temperature in Apostle Islands in April | ||||
May | 39.6°F | 34°F | 47.8°F | cold |
Water temperature in Apostle Islands in May | ||||
June | 48.4°F | 34.2°F | 63.7°F | cold |
Water temperature in Apostle Islands in June | ||||
July | 61.5°F | 46.9°F | 71.8°F | cold |
Water temperature in Apostle Islands in July | ||||
August | 66°F | 57.4°F | 72.1°F | cold |
Water temperature in Apostle Islands in August | ||||
September | 61°F | 52.7°F | 70.2°F | cold |
Water temperature in Apostle Islands in September | ||||
October | 52.2°F | 44.6°F | 63.3°F | cold |
Water temperature in Apostle Islands in October | ||||
November | 44.4°F | 37.6°F | 51.1°F | cold |
Water temperature in Apostle Islands in November | ||||
December | 38.5°F | 33.6°F | 44.2°F | cold |
Water temperature in Apostle Islands in December |