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Middleton Island Sea Temperature in September

Alaska, United States

August Middleton Island year-round → October

Average sea temperature for Middleton Island, United States across September, based on 10 years of daily readings.

Average

12.97° C

High

15.48° C

Low

10.96° C

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

September is the 3rd warmest of 12 months at Middleton Island. On average the water sits 3.9° than the year-round mean of 9.03° C.

Compared to August, September is 1.4° cooler than (14.34° C in August). By October the water is usually 10.51° C.

Middleton Island Day-by-Day Water Temperature in September

10-year low, average and high

10.0° C
11.6° C
13.3° C
14.9° C
16.5° C
1
5
10
15
20
25
30
Day-by-day low and high band with the 10-year daily average through September. Range Average

Each vertical bar above is one day of September. 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 Middleton Island.

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.

September Water Temperature Table for Middleton Island

10-year daily averages

Day Average Low High
September 1 13.91° C 13.46° C 15.07° C
September 2 13.74° C 12.88° C 15.19° C
September 3 13.7° C 12.83° C 15.4° C
September 4 13.69° C 12.87° C 15.24° C
September 5 13.67° C 12.96° C 15.33° C
September 6 13.79° C 13.05° C 15.36° C
September 7 13.85° C 13.01° C 15.43° C
September 8 13.8° C 12.92° C 15.48° C
September 9 13.66° C 12.6° C 15.41° C
September 10 13.5° C 12.44° C 15.37° C
September 11 13.47° C 12.43° C 15.14° C
September 12 13.37° C 12.24° C 14.94° C
September 13 13.32° C 12.17° C 14.64° C
September 14 13.28° C 12.02° C 14.54° C
September 15 13.22° C 11.93° C 14.76° C
September 16 13.05° C 11.86° C 14.46° C
September 17 12.95° C 11.8° C 14° C
September 18 12.86° C 11.76° C 13.8° C
September 19 12.66° C 11.75° C 13.39° C
September 20 12.58° C 11.74° C 13.42° C
September 21 12.49° C 11.63° C 13.56° C
September 22 12.48° C 11.65° C 13.46° C
September 23 12.39° C 11.66° C 13.34° C
September 24 12.18° C 11.28° C 13.28° C
September 25 12.11° C 11.22° C 13.19° C
September 26 12.03° C 11.2° C 13.12° C
September 27 11.98° C 11.17° C 13.01° C
September 28 11.85° C 11.07° C 12.85° C
September 29 11.79° C 11.04° C 12.8° C
September 30 11.7° C 10.96° C 12.68° C

Where September Sits in the Year

September highlighted

3.0° C
7.0° C
11.0° C
15.0° C
19.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
6.44° C
5.87° C
5.51° C
6.03° C
7.35° C
10.31° C
13.25° C
14.34° C
12.97° C
10.51° C
8.55° C
7.23° C
10-year monthly history for Middleton Island. 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 September

Compare other United States water for the same month

Middleton Island Location

59.4667, -146.3170

59.46670, -146.31700 View on OpenStreetMap →

Middleton Island sits at 59.4667°N, 146.3170°W, on the coast of Alaska, 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 Middleton Island