World sea water temperatures

Water temperature in Cornucopia (WI) in September

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Is it warm enough to swim in Cornucopia in September? Average water temperature in Cornucopia in September is 60.6°F and therefore is not suitable for comfortable swimming. The warmest water in Cornucopia in September is 68.4°F, and the coldest is 51.3°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Cornucopia

Changes water temperature in Cornucopia in September 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 163.5°F63.7°F60.4°F67.1°F
September 265.1°F63.9°F59.9°F66.7°F
September 364.4°F64°F59.9°F67.1°F
September 464°F64.6°F60.1°F67.3°F
September 5 64.2°F60.4°F68.4°F
September 6 63.9°F60.1°F67.6°F
September 7 63.9°F60.1°F66.7°F
September 8 63°F59.7°F64.4°F
September 9 63.5°F58.5°F64.4°F
September 10 63.3°F57.6°F64°F
September 11 64.4°F54.9°F64.4°F
September 12 64.9°F53.8°F64.9°F
September 13 64.9°F55°F64.9°F
September 14 64.6°F54.7°F64.6°F
September 15 64.8°F54.5°F64.8°F
Day 2025 2024 Min Max
September 16 64.8°F53.4°F64.8°F
September 17 65.1°F52.9°F65.1°F
September 18 65.7°F52.5°F65.7°F
September 19 66°F52.7°F66°F
September 20 64.4°F53.1°F64.4°F
September 21 64.9°F51.8°F64.9°F
September 22 65.1°F51.3°F65.1°F
September 23 64.9°F51.4°F64.9°F
September 24 64.4°F52.3°F64.4°F
September 25 64.9°F52.2°F64.9°F
September 26 65.3°F52°F65.3°F
September 27 65.7°F52.3°F65.7°F
September 28 65.3°F52.3°F65.3°F
September 29 65.1°F52.2°F65.1°F
September 30 64.6°F52.3°F64.6°F
Cornucopia water temp chart in September

Average water temperature in Cornucopia in September over a decade

20152016201720182019
59.5°F61.9°F61.9°F62.6°F55.6°F
20202021202220232024
58.8°F62.8°F60.8°F63.1°F64.6°F

Cornucopia sea state in September

Chart comparing the height of waves in Cornucopia in September 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 Cornucopia in September

Cornucopia 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 September?

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

AvrMinMax
Herbster60.3°F50.5°F67.6°F
Port Wing60.3°F50.7°F66.7°F
Beaver Bay58.5°F47.3°F66.7°F
Big Bay State Park62.2°F54.9°F70.9°F
Knife River59.9°F47.5°F67.1°F
French River60.6°F48.2°F68.7°F
Park Point61.3°F51.4°F70.3°F
Ontonagon61.3°F49.8°F70°F
Grand Portage58.1°F46°F65.7°F
McLain State Park60.8°F43.3°F70°F

Wisconsin photo gallery

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

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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 Cornucopia 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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