World sea water temperatures

Water temperature in Green Bay (WI) in May

Is it warm enough to swim in Green Bay in May? Average water temperature in Green Bay in May is 54.9°F and therefore is not suitable for comfortable swimming. The warmest water in Green Bay in May is 65.8°F, and the coldest is 36.5°F. Average high air temperature in Green Bay in May is 66°F, and average low temperature is 44°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Green Bay

Changes water temperature in Green Bay in May 2025, 2024

To get an accurate forecast for the water temperature in Green 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 Green 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 151.3°F50°F37.4°F51.3°F
May 250.9°F49.5°F36.5°F52.7°F
May 350.9°F49.5°F38.3°F52.7°F
May 453.1°F54°F40.8°F54°F
May 554.1°F54.5°F42.3°F54.5°F
May 652.3°F55.4°F43.5°F55.4°F
May 756.7°F56.1°F45.7°F56.7°F
May 857°F56.1°F44.4°F57°F
May 955.9°F56.3°F45.7°F56.3°F
May 1056.7°F56.1°F47.7°F56.7°F
May 1157.4°F57.9°F48.4°F57.9°F
May 1257.2°F57.9°F45°F57.9°F
May 1358.5°F58.6°F46°F58.6°F
May 1461°F59.5°F47.1°F61°F
May 1561.7°F60.1°F47.8°F61.7°F
Day 2025 2024 Min Max
May 1662.8°F60.1°F48.7°F62.8°F
May 1762.4°F59.9°F49.5°F62.4°F
May 1862.6°F60.8°F51.8°F62.6°F
May 1962.4°F62.2°F52.7°F62.4°F
May 2062.6°F62.4°F50.7°F62.6°F
May 2162.6°F62.8°F52°F62.8°F
May 2262.4°F63.3°F53.2°F63.3°F
May 2362.1°F64.8°F53.8°F64.8°F
May 2458.8°F64.4°F53.8°F64.4°F
May 2557.9°F64.8°F54.1°F64.8°F
May 2658.5°F64.2°F54.5°F64.2°F
May 2758.5°F63.9°F54.9°F64.6°F
May 2858.5°F63.3°F55.2°F64°F
May 2958.5°F63°F55.4°F64.6°F
May 3059.7°F62.6°F55.8°F65.8°F
May 3159.9°F62.8°F58.3°F65.7°F
Green Bay water temp chart in May

Average water temperature in Green Bay in May over a decade

20162017201820192020
56.1°F55.9°F53.2°F52.2°F53.2°F
20212022202320242025
55.9°F55.6°F52.3°F59.2°F58.3°F

Green Bay sea state in May

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

Weather and climate in Green Bay in May

This data display average monthly climate indicators in Green Bay in May based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature66°F
  • Average LOW temperature44°F
  • Average humidity
    66
  • Average rainfall days11 days
  • Average rainfall74mm/2.9''
  • Average daylight15h
  • Average sunshine9.2h
  • Average UV index7

Green Bay water temperature during other months:

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

Water temperature at Lake Michigan in May

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
Suamico54.5°F38.1°F66.4°F
Oconto50.7°F37.2°F64.6°F
Kewaunee42.8°F34.3°F52.5°F
Algoma41.9°F34.2°F51.1°F
Little Sturgeon Bay48.4°F36°F59.4°F
Sturgeon Bay43.2°F33.8°F52.5°F
Marinette47.1°F35.4°F58.3°F
Two Rivers42.4°F35.2°F53.1°F
Menominee46.8°F35.8°F57.6°F
Lake Winnebago57.2°F44.6°F68.9°F

Wisconsin photo gallery

  • Green Flash seen from Bradford Beach
  • North of Oak Creek Power Plant (zoom to see it's smoke stacks)

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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 Green 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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