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Johnston Atoll Sea Temperature in October

Minor Outlying Islands, United States

September Johnston Atoll year-round → November

Average sea temperature for Johnston Atoll, United States across October, based on 10 years of daily readings.

Average

28.16° C

High

29.38° C

Low

27.22° C

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

October is the 2nd warmest of 12 months at Johnston Atoll. On average the water sits 1.0° than the year-round mean of 27.15° C.

Compared to September, October is 0.1° about the same as (28.26° C in September). By November the water is usually 27.69° C.

Johnston Atoll Day-by-Day Water Temperature in October

10-year low, average and high

26.5° C
27.4° C
28.3° C
29.1° C
30.0° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through October. Range Average

Each vertical bar above is one day of October. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Johnston Atoll.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

October Water Temperature Table for Johnston Atoll

10-year daily averages

Day Average Low High
October 1 28.29° C 27.88° C 28.94° C
October 2 28.25° C 27.82° C 28.91° C
October 3 28.23° C 27.79° C 28.98° C
October 4 28.22° C 27.84° C 29.02° C
October 5 28.2° C 27.87° C 28.87° C
October 6 28.17° C 27.78° C 28.76° C
October 7 28.14° C 27.78° C 28.73° C
October 8 28.14° C 27.78° C 28.82° C
October 9 28.27° C 27.84° C 29.38° C
October 10 28.24° C 27.85° C 29.15° C
October 11 28.23° C 27.83° C 29.09° C
October 12 28.26° C 27.92° C 29.08° C
October 13 28.27° C 27.94° C 28.99° C
October 14 28.21° C 27.92° C 28.81° C
October 15 28.17° C 27.9° C 28.63° C
October 16 28.09° C 27.68° C 28.57° C
October 17 28.06° C 27.53° C 28.63° C
October 18 28.08° C 27.59° C 28.68° C
October 19 28.09° C 27.65° C 28.73° C
October 20 28.15° C 27.78° C 28.73° C
October 21 28.16° C 27.77° C 28.82° C
October 22 28.18° C 27.86° C 28.78° C
October 23 28.19° C 27.93° C 28.75° C
October 24 28.17° C 28.05° C 28.53° C
October 25 28.2° C 28.04° C 28.74° C
October 26 28.2° C 27.93° C 28.75° C
October 27 28.13° C 27.81° C 28.68° C
October 28 28.06° C 27.68° C 28.56° C
October 29 28.01° C 27.29° C 28.69° C
October 30 27.96° C 27.22° C 28.53° C
October 31 27.94° C 27.32° C 28.47° C

Where October Sits in the Year

October highlighted

24.0° C
25.8° C
27.5° C
29.3° C
31.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
26.5° C
26.14° C
26.06° C
26.26° C
26.73° C
27.25° C
27.68° C
28.02° C
28.26° C
28.16° C
27.69° C
27.01° C
10-year monthly history for Johnston Atoll. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in October

Compare other United States water for the same month

Johnston Atoll Location

16.7333, -169.5333

16.73330, -169.53330 View on OpenStreetMap →

Johnston Atoll sits at 16.7333°N, 169.5333°W, on the coast of Minor Outlying Islands, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Johnston Atoll