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Herendeen Island, Shumagin Islands Sea Temperature in September

Alaska, United States

August Herendeen Island, Shumagin Islands year-round → October

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

Average

11.27° C

High

13.41° C

Low

9.8° 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 2nd warmest of 12 months at Herendeen Island, Shumagin Islands. On average the water sits 4.0° than the year-round mean of 7.29° C.

Compared to August, September is 1.1° cooler than (12.4° C in August). By October the water is usually 9.49° C.

Herendeen Island, Shumagin Islands Day-by-Day Water Temperature in September

10-year low, average and high

9.0° C
10.3° C
11.5° C
12.8° C
14.0° 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 Herendeen Island, Shumagin Islands.

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 Herendeen Island, Shumagin Islands

10-year daily averages

Day Average Low High
September 1 12.07° C 10.73° C 13.41° C
September 2 11.8° C 10.73° C 12.76° C
September 3 11.86° C 10.74° C 12.75° C
September 4 11.88° C 10.76° C 12.69° C
September 5 11.85° C 10.82° C 12.65° C
September 6 11.78° C 10.83° C 12.56° C
September 7 11.67° C 10.78° C 12.54° C
September 8 11.67° C 10.84° C 12.54° C
September 9 11.62° C 10.77° C 12.51° C
September 10 11.65° C 10.77° C 12.58° C
September 11 11.6° C 10.76° C 12.63° C
September 12 11.57° C 10.69° C 12.66° C
September 13 11.45° C 10.62° C 12.31° C
September 14 11.45° C 10.61° C 12.38° C
September 15 11.43° C 10.52° C 12.4° C
September 16 11.33° C 10.54° C 12.37° C
September 17 11.22° C 10.44° C 12.34° C
September 18 11.06° C 10.38° C 11.81° C
September 19 11.02° C 10.38° C 11.84° C
September 20 10.97° C 10.34° C 11.84° C
September 21 10.95° C 10.3° C 11.77° C
September 22 10.9° C 10.12° C 11.72° C
September 23 10.84° C 10.11° C 11.72° C
September 24 10.81° C 10.07° C 11.57° C
September 25 10.77° C 9.99° C 11.39° C
September 26 10.72° C 10.03° C 11.5° C
September 27 10.65° C 9.92° C 11.51° C
September 28 10.6° C 9.89° C 11.69° C
September 29 10.52° C 9.86° C 11.67° C
September 30 10.41° C 9.8° C 11.41° C

Where September Sits in the Year

September highlighted

0.5° C
4.5° C
8.5° C
12.5° C
16.5° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
4.68° C
4.16° C
3.67° C
3.95° C
5.47° C
8.16° C
11.01° C
12.4° C
11.27° C
9.49° C
7.47° C
5.78° C
10-year monthly history for Herendeen Island, Shumagin Islands. 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

Herendeen Island, Shumagin Islands Location

55.0656, -159.4187

55.06560, -159.41870 View on OpenStreetMap →

Herendeen Island, Shumagin Islands sits at 55.0656°N, 159.4187°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 Herendeen Island, Shumagin Islands