World sea water temperatures

Water temperature in Apostle Islands (WI) in May

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Is it warm enough to swim in Apostle Islands in May? Average water temperature in Apostle Islands in May is 39.6°F and therefore is not suitable for comfortable swimming. The warmest water in Apostle Islands in May is 47.8°F, and the coldest is 34°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Apostle Islands

Changes water temperature in Apostle Islands in May 2025, 2024

To get an accurate forecast for the water temperature in Apostle Islands for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Apostle Islands, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 137.2°F39.6°F34.5°F42.1°F
May 237.2°F38.1°F34.5°F41.2°F
May 339.7°F39.7°F34.7°F40.3°F
May 439.4°F41.2°F34°F41.2°F
May 540.6°F40.8°F34°F40.8°F
May 640.5°F39.6°F34.2°F40.6°F
May 739.7°F41°F34.7°F41.7°F
May 838.8°F38.1°F35.1°F41.2°F
May 939.9°F39.7°F35.2°F41°F
May 1039.7°F38.5°F35.8°F42.3°F
May 1139.2°F40.8°F36°F41.9°F
May 1242.1°F41°F35.1°F43.3°F
May 1342.4°F41.9°F34.9°F44.6°F
May 1442.6°F41.4°F35.6°F47.8°F
May 1540.5°F41.9°F36°F44.1°F
Day 2025 2024 Min Max
May 1639.4°F42.3°F36.1°F43.9°F
May 1739.4°F41.7°F36.3°F45°F
May 1840.1°F42.6°F35.8°F47.8°F
May 1938.7°F45.1°F36.5°F46.9°F
May 2038.8°F44.2°F34.3°F46.2°F
May 2139°F42.4°F36°F46.4°F
May 2240.1°F42.1°F36.9°F45.9°F
May 2339.6°F43.3°F37.4°F45.5°F
May 2439.2°F43.9°F37.8°F45.3°F
May 2540.5°F43°F37.2°F45.5°F
May 2642.6°F43°F37.2°F46°F
May 2741.4°F43.3°F37.6°F47.1°F
May 2842.6°F47.3°F37.8°F47.3°F
May 2942.4°F43.7°F38.3°F45.7°F
May 3043.2°F45.3°F37.9°F45.9°F
May 3144.1°F45.1°F38.1°F46.4°F
Apostle Islands water temp chart in May

Average water temperature in Apostle Islands in May over a decade

20162017201820192020
41.4°F38.8°F37.8°F38.1°F39.2°F
20212022202320242025
42.4°F37.8°F37.4°F41.9°F40.3°F

Apostle Islands sea state in May

Chart comparing the height of waves in Apostle Islands in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Apostle Islands in May

Apostle Islands water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in May?

Want to know where the water temperature in May is good for swimming? Select the continent of interest, the day of the month and the required water temperature

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

Temperature in neighboring cities

The nearest locations with the average water temperature in May. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Madeline Island41.4°F32.7°F51.6°F
Big Bay State Park41.4°F32.7°F51.6°F
Cornucopia39.4°F33.3°F50.2°F
Herbster38.5°F33.1°F46°F
Silver Bay36.9°F32.5°F41.7°F
Beaver Bay36.9°F32.7°F41.7°F
Tofte36.9°F33.1°F41.5°F
Schroeder36.9°F32.9°F41.5°F
Port Wing38.7°F33.3°F46.8°F
Lutsen36.9°F32.9°F41.4°F

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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 Apostle Islands 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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