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Water temperature in Thunder Bay (MI) in May

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Is it warm enough to swim in Thunder Bay in May? Average water temperature in Thunder Bay in May is 45.9°F and therefore is not suitable for comfortable swimming. The warmest water in Thunder Bay in May is 56.7°F, and the coldest is 36.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Thunder Bay

Changes water temperature in Thunder Bay in May 2025, 2024

To get an accurate forecast for the water temperature in Thunder Bay for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Thunder Bay, 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 142.8°F40.5°F37.4°F43°F
May 242.4°F40.1°F37.4°F42.8°F
May 342.3°F40.8°F37.4°F45°F
May 443.2°F40.6°F37.8°F45.1°F
May 542.1°F39.6°F38.7°F46.2°F
May 642.1°F41.5°F39°F47.3°F
May 743.2°F41.4°F39.6°F48.9°F
May 844.8°F43°F37.2°F50.2°F
May 945.3°F43.9°F38.7°F49.5°F
May 1046.4°F47.5°F39.6°F47.8°F
May 1147.1°F49.6°F38.8°F49.6°F
May 1247.3°F50.4°F36.1°F50.4°F
May 1346.9°F46.2°F36.5°F46.9°F
May 1446.8°F49.3°F37.6°F49.3°F
May 1545.1°F49.8°F37.8°F49.8°F
Day 2025 2024 Min Max
May 1645.1°F50.5°F40.5°F50.5°F
May 1743.2°F52°F41.9°F52°F
May 1845.9°F52.2°F42.6°F52.2°F
May 1946.2°F51.3°F43°F51.3°F
May 2046.9°F51.8°F43.7°F51.8°F
May 2147.3°F54.1°F41.4°F54.1°F
May 2247.7°F53.8°F43°F53.8°F
May 2348°F54.5°F43.7°F54.5°F
May 2447.7°F54.1°F44.6°F54.1°F
May 2546.8°F55.4°F44.6°F55.4°F
May 2648.2°F54.9°F45°F54.9°F
May 2747.1°F54°F45.3°F54.1°F
May 2848.6°F54.3°F44.8°F55.9°F
May 2948.2°F54.5°F45.7°F54.9°F
May 3048.6°F55.4°F46.9°F56.5°F
May 3150°F56.7°F48.9°F56.7°F
Thunder Bay water temp chart in May

Average water temperature in Thunder Bay in May over a decade

20162017201820192020
47.7°F46.2°F45.3°F43°F42.8°F
20212022202320242025
45.1°F46.6°F45°F49.1°F45.9°F

Thunder Bay sea state in May

Chart comparing the height of waves in Thunder Bay 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 Thunder Bay in May

Thunder Bay 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
Harbor View41°F35.1°F52.9°F
Presque Isle Harbor41°F35.1°F52.9°F
Manitou Beach40.5°F34.7°F53.2°F
East Tawas47.7°F38.3°F59°F
Evergreen Beach40.8°F34.3°F53.1°F
Tawas City48.2°F38.5°F60.4°F
Huron Beach40.8°F33.8°F52.9°F
Hammond Bay40.8°F33.8°F52.9°F
Port Austin46.4°F37.4°F60.1°F
Oak Beach49.3°F38.7°F62.6°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 Thunder Bay 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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