Johnston Atoll water temp

This data the coastal Johnston Atoll sea water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current sea temperature in Johnston Atoll

Water temperature in Johnston Atoll today is 82.9°F. Based on our historical data over a period of ten years, the warmest water in this day in Johnston Atoll was recorded in 2019 and was 84°F, and the coldest was recorded in 2010 at 80.6°F. Sea water temperature in Johnston Atoll is expected to drop to 82°F in the next 10 days. October average water temperature in Johnston Atoll is 82.4°F, the minimum temperature is 80.2°F, and the maximum is 84.4°F.

The swimming season in Johnston Atoll lasts from January to December, twelve months per year! During those months, Johnston Atoll water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Johnston Atoll in winter reaches 79.3°F, in spring 79°F, in summer the average temperature rises to 81.5°F, and in autumn it is 82.2°F.

Johnston Atoll water temperature now

Surf Forecast in Johnston Atoll for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Johnston Atoll. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Johnston Atoll. Data in table shown for October 22, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Johnston Atoll

Johnston Atoll weather forecast

Johnston Atoll water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Johnston Atoll. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Johnston Atoll on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Johnston Atoll

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Our report for Johnston Atoll 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.