World sea water temperatures

Water temperature in Apostle Islands (WI) in August

Home > United States > Wisconsin > Apostle Islands

Is it warm enough to swim in Apostle Islands in August? Average water temperature in Apostle Islands in August is 66°F and therefore is not suitable for comfortable swimming. The warmest water in Apostle Islands in August is 72.1°F, and the coldest is 57.4°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Apostle Islands

Changes water temperature in Apostle Islands in August 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 165.3°F69.6°F59.5°F70.7°F
August 265.5°F69.8°F60.3°F71.4°F
August 366.4°F69.6°F60.4°F71.1°F
August 467.1°F70°F59.7°F70.5°F
August 567.5°F67.6°F62.1°F69.1°F
August 667.8°F67.5°F61.7°F68.7°F
August 769.6°F69.1°F62.2°F69.6°F
August 870.5°F68.9°F62.2°F70.5°F
August 971.1°F67.1°F62.2°F71.1°F
August 1069.6°F66.9°F62.1°F70.5°F
August 1168.5°F66.6°F62.1°F68.7°F
August 1268.9°F65.5°F61.9°F70.7°F
August 1368°F66.9°F62.1°F71.8°F
August 1467.5°F67.5°F62.2°F71.8°F
August 1569.6°F67.8°F62.4°F70°F
Day 2025 2024 Min Max
August 1669.8°F67.5°F63.7°F69.8°F
August 1767.1°F67.1°F63.3°F70.9°F
August 1866.2°F66.9°F61.3°F70.3°F
August 1966°F65.7°F62.2°F70.3°F
August 2065.7°F65.8°F62.4°F70.5°F
August 2165.7°F66°F62.8°F69.4°F
August 2266.7°F65.7°F62.1°F68°F
August 2365.3°F66.6°F62.1°F69.3°F
August 2464°F66.6°F61.5°F68.5°F
August 2562.4°F67.5°F59°F69.1°F
August 2661.3°F70°F57.4°F70°F
August 2762.2°F69.4°F57.9°F70.5°F
August 2861.7°F67.6°F59.5°F70.7°F
August 2961.2°F65.8°F59.5°F72.1°F
August 3061.7°F64.8°F58.6°F71.6°F
August 3162.8°F65.1°F59°F71.2°F
Apostle Islands water temp chart in August

Average water temperature in Apostle Islands in August over a decade

20162017201820192020
68.4°F63.1°F66.6°F66.7°F67.1°F
20212022202320242025
67.5°F63.5°F65.3°F67.5°F67.8°F

Apostle Islands sea state in August

Chart comparing the height of waves in Apostle Islands in August 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 Apostle Islands in August

Apostle Islands 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 August?

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

AvrMinMax
Madeline Island67.6°F60.4°F73.2°F
Big Bay State Park67.6°F60.4°F73.2°F
Cornucopia64.9°F54.5°F72°F
Herbster64.6°F53.1°F72°F
Silver Bay61.5°F44.1°F69.8°F
Beaver Bay61.9°F43.3°F69.8°F
Tofte61.3°F44.1°F69.3°F
Schroeder61.2°F44.1°F69.1°F
Port Wing64.6°F52°F71.6°F
Lutsen61°F43.9°F69.3°F

Wisconsin photo gallery

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

If you have interesting photos of this place, you can upload them here. Photos will be available to all users after verification by the moderator.

Vote for Wisconsin best beach

Sandy beach

Current rating: 5,0 (1 votes cast)

If you know this place (Apostle Islands) and want to leave your comment or rate it, then fill out the following form.

Your rating for this place:

Does this place have a "Blue Flag" award [1], are there rip currents and what type of beach is it, sand or pebble:

Is the beach a dog-friendly place, child friendly or a nudist beach?


Your comments for this place (water quality, crowds, facilities, activities, lifeguards, service etc.):



[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.

Get widget or API for your website

Our report for Apostle Islands 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.

Contact us: admin@seatemperature.info
privacy policy