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Water temperature in Thunder Bay (MI) in July

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Is it warm enough to swim in Thunder Bay in July? Average water temperature in Thunder Bay in July is 66.7°F and therefore is not suitable for comfortable swimming. The warmest water in Thunder Bay in July is 74.3°F, and the coldest is 58.8°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 July 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 July.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
July 162.2°F61.9°F59.4°F66°F
July 263.5°F62.6°F59.5°F68°F
July 365.3°F62.6°F60.3°F71.8°F
July 464.9°F63.3°F61.2°F71.2°F
July 565.8°F64.2°F60.6°F70.2°F
July 666.6°F64.9°F60.3°F69.6°F
July 765.5°F66.2°F60.4°F70.7°F
July 864.6°F66.9°F60.4°F72°F
July 966°F67.3°F59.2°F73°F
July 1066.7°F66.9°F58.8°F74.3°F
July 1167.1°F68.7°F59.4°F72.1°F
July 1269.4°F69.3°F58.8°F71.8°F
July 1368.7°F70.3°F62.1°F71.2°F
July 1469.4°F70°F62.1°F71.4°F
July 1569.8°F70.2°F61.7°F71.6°F
Day 2025 2024 Min Max
July 1669.6°F72°F61°F72°F
July 1766.9°F71.2°F61.5°F72.5°F
July 1867.5°F70°F62.8°F72.3°F
July 1966.9°F69.4°F63.7°F71.6°F
July 2067.1°F69.3°F64°F71.8°F
July 2166.7°F69.8°F63.7°F71.4°F
July 2267.8°F70.2°F63.1°F71.8°F
July 2368.2°F70°F63.3°F72.1°F
July 2468.7°F69.8°F62.1°F72.1°F
July 2569.1°F70°F62.4°F72°F
July 2669.1°F70.2°F63.3°F70.7°F
July 2770.5°F70.2°F62.8°F70.7°F
July 2872.9°F70.7°F61.3°F72.9°F
July 2971.8°F71.1°F61.2°F71.8°F
July 3072.7°F71.8°F61.5°F72.7°F
July 3171.8°F73.2°F62.2°F73.2°F
Thunder Bay water temp chart in July

Average water temperature in Thunder Bay in July over a decade

20162017201820192020
66.2°F65.3°F66°F67.3°F70°F
20212022202320242025
66.6°F65.3°F67.8°F68.5°F67.8°F

Thunder Bay sea state in July

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

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 July?

Want to know where the water temperature in July 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 July. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Harbor View64.6°F52.2°F72.5°F
Presque Isle Harbor64.6°F52.2°F72.5°F
Manitou Beach65.3°F50.9°F74.3°F
East Tawas68.5°F57.4°F76.8°F
Evergreen Beach65.7°F53.6°F74.1°F
Tawas City69.4°F58.5°F77°F
Huron Beach65.8°F55.9°F74.1°F
Hammond Bay65.8°F55.9°F74.1°F
Port Austin69.6°F61.3°F76.5°F
Oak Beach70.9°F64°F77.5°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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