World sea water temperatures

Water temperature in Ontonagon (MI) in May

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Is it warm enough to swim in Ontonagon in May? Average water temperature in Ontonagon in May is 39.2°F and therefore is not suitable for comfortable swimming. The warmest water in Ontonagon in May is 48.7°F, and the coldest is 33.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Ontonagon

Changes water temperature in Ontonagon in May 2025, 2024

To get an accurate forecast for the water temperature in Ontonagon for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Ontonagon, 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 136.9°F41.5°F33.1°F41.5°F
May 236.9°F38.7°F33.8°F41.2°F
May 336.7°F40.3°F34°F40.3°F
May 439.2°F40.5°F33.3°F41.5°F
May 540.8°F42.1°F33.6°F42.1°F
May 640.3°F42.3°F34°F42.3°F
May 739.6°F41.4°F34.9°F41.4°F
May 839.2°F40.5°F34.5°F40.5°F
May 941.2°F41.4°F35.8°F41.4°F
May 1039.9°F40.3°F34.7°F40.3°F
May 1141.7°F39.6°F34.5°F41.7°F
May 1244.2°F43.5°F34.3°F44.2°F
May 1344.6°F44.1°F34.7°F44.6°F
May 1439.9°F43.3°F33.6°F44.8°F
May 1540.1°F41.4°F34.2°F41.4°F
Day 2025 2024 Min Max
May 1641.5°F41.4°F34.3°F41.5°F
May 1741.2°F39.9°F34.7°F43.9°F
May 1841°F40.5°F35.1°F43.2°F
May 1940.6°F41°F35.4°F44.6°F
May 2039.2°F40.6°F37.4°F43.2°F
May 2139.6°F41°F36.5°F44.1°F
May 2241.5°F43°F36.7°F43.9°F
May 2341.2°F43.2°F37.2°F43.5°F
May 2439.4°F42.6°F37.8°F42.6°F
May 2541.9°F42.3°F37.4°F44.4°F
May 2642.8°F42.3°F37.2°F44.2°F
May 2740.8°F44.6°F37.2°F45.5°F
May 2841.5°F44.2°F38.1°F44.2°F
May 2941°F45.9°F38.7°F46.4°F
May 3042.4°F48.7°F38.7°F48.7°F
May 3141.4°F47.5°F39.2°F47.5°F
Ontonagon water temp chart in May

Average water temperature in Ontonagon in May over a decade

20162017201820192020
40.3°F38.7°F38.8°F37.6°F38.8°F
20212022202320242025
41°F37.2°F37.8°F42.3°F40.6°F

Ontonagon sea state in May

Chart comparing the height of waves in Ontonagon 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 Ontonagon in May

Ontonagon 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
McLain State Park39.2°F34.3°F49.5°F
Calumet38.8°F33.8°F49.3°F
Keweenaw Bay38.3°F33.4°F45.5°F
Apostle Islands39.6°F34°F47.8°F
Eagle River37.2°F33.3°F42.4°F
Madeline Island41.4°F32.7°F51.6°F
Big Bay State Park41.4°F32.7°F51.6°F
Washburn41.9°F32.5°F52.9°F
Bayfield42.6°F34.3°F53.6°F
Eagle Harbor37°F33.3°F41.9°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 Ontonagon 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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