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Cape Mordvinof, Unimak Island, Alaska Sea Temperature in September

Alaska, United States

August Cape Mordvinof, Unimak Island, Alaska year-round → October

Average sea temperature for Cape Mordvinof, Unimak Island, Alaska, United States across September, based on 10 years of daily readings.

Average

9.2° C

High

12.49° C

Low

7.9° C

This water is very cold and can cause pain. We don't recommend you swim in this temperature for anything other than very short swims of 5 to 10 minutes unless you are a very experienced cold water swimmer.

September is the 2nd warmest of 12 months at Cape Mordvinof, Unimak Island, Alaska. On average the water sits 3.0° than the year-round mean of 6.21° C.

Compared to August, September is 1.1° cooler than (10.31° C in August). By October the water is usually 8.06° C.

Cape Mordvinof, Unimak Island, Alaska Day-by-Day Water Temperature in September

10-year low, average and high

7.0° C
8.6° C
10.3° C
11.9° C
13.5° 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 Cape Mordvinof, Unimak Island, Alaska.

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 Cape Mordvinof, Unimak Island, Alaska

10-year daily averages

Day Average Low High
September 1 9.9° C 8.23° C 12.49° C
September 2 9.81° C 8.31° C 11.75° C
September 3 9.77° C 8.39° C 11.72° C
September 4 9.59° C 8.38° C 11.22° C
September 5 9.52° C 8.4° C 10.7° C
September 6 9.51° C 8.52° C 10.74° C
September 7 9.47° C 8.37° C 10.77° C
September 8 9.43° C 8.23° C 10.66° C
September 9 9.37° C 8.34° C 10.43° C
September 10 9.38° C 8.39° C 10.42° C
September 11 9.4° C 8.57° C 10.48° C
September 12 9.31° C 8.59° C 10.07° C
September 13 9.17° C 8.33° C 10.01° C
September 14 9.18° C 8.54° C 10.15° C
September 15 9.19° C 8.55° C 10.29° C
September 16 9.16° C 8.57° C 10.43° C
September 17 9.2° C 8.58° C 10.64° C
September 18 9.19° C 8.44° C 10.66° C
September 19 9.07° C 8.38° C 10.09° C
September 20 9.05° C 8.4° C 9.69° C
September 21 9.09° C 8.54° C 9.7° C
September 22 8.99° C 8.32° C 9.69° C
September 23 8.93° C 8.3° C 9.67° C
September 24 8.85° C 8.27° C 9.41° C
September 25 8.81° C 8.18° C 9.41° C
September 26 8.81° C 8.07° C 9.32° C
September 27 8.77° C 7.99° C 9.32° C
September 28 8.76° C 7.96° C 9.48° C
September 29 8.64° C 7.9° C 9.45° C
September 30 8.55° C 7.95° C 9.37° C

Where September Sits in the Year

September highlighted

-3.0° C
1.9° C
6.8° C
11.6° C
16.5° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
4.23° C
3.61° C
3.04° C
3.17° C
4.74° C
6.93° C
9.16° C
10.31° C
9.2° C
8.06° C
6.76° C
5.35° C
10-year monthly history for Cape Mordvinof, Unimak Island, Alaska. 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

Cape Mordvinof, Unimak Island, Alaska Location

54.9283, -164.4670

54.92830, -164.46699 View on OpenStreetMap →

Cape Mordvinof, Unimak Island, Alaska sits at 54.9283°N, 164.4670°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 Cape Mordvinof, Unimak Island, Alaska