Georgetown Sea Temperature in September

Average sea temperature for Georgetown, Ascension Island across September, based on 10 years of daily readings.

Average

24.62° C

High

25.74° C

Low

23.85° C

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

September is the 12th warmest of 12 months at Georgetown. On average the water sits 1.8° than the year-round mean of 26.4° C.

Compared to August, September is 0.5° cooler than (25.13° C in August). By October the water is usually 24.66° C.

Georgetown Day-by-Day Water Temperature in September

10-year low, average and high

23.0° C

23.9° C

24.8° C

25.6° C

26.5° 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 Georgetown.

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 Georgetown

10-year daily averages

Day	Average	Low	High
September 1	24.93° C	24° C	25.74° C
September 2	24.9° C	24.12° C	25.65° C
September 3	24.82° C	24.17° C	25.37° C
September 4	24.76° C	24.17° C	25.42° C
September 5	24.74° C	23.99° C	25.59° C
September 6	24.79° C	24.08° C	25.62° C
September 7	24.75° C	24.09° C	25.48° C
September 8	24.74° C	23.98° C	25.48° C
September 9	24.72° C	23.99° C	25.44° C
September 10	24.7° C	24.06° C	25.54° C
September 11	24.66° C	23.98° C	25.49° C
September 12	24.6° C	23.95° C	25.33° C
September 13	24.57° C	23.89° C	25.32° C
September 14	24.56° C	23.97° C	25.35° C
September 15	24.55° C	24.01° C	25.43° C
September 16	24.55° C	24.05° C	25.4° C
September 17	24.57° C	23.97° C	25.4° C
September 18	24.57° C	23.92° C	25.41° C
September 19	24.5° C	23.94° C	25.12° C
September 20	24.47° C	23.99° C	25.14° C
September 21	24.46° C	23.92° C	25.22° C
September 22	24.49° C	23.85° C	25.26° C
September 23	24.52° C	24.04° C	25.24° C
September 24	24.53° C	24.09° C	25.22° C
September 25	24.52° C	24.1° C	25.2° C
September 26	24.51° C	24.1° C	25.21° C
September 27	24.52° C	24.11° C	25.2° C
September 28	24.55° C	24.08° C	25.3° C
September 29	24.55° C	24° C	25.44° C
September 30	24.57° C	23.93° C	25.7° C

Where September Sits in the Year

September highlighted

22.5° C

24.6° C

26.8° C

28.9° C

31.0° C

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

26.44° C

27.41° C

28.17° C

28.31° C

27.99° C

27.17° C

26.12° C

25.13° C

24.62° C

24.66° C

25.04° C

25.7° C

10-year monthly history for Georgetown. 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 →

Georgetown Location

-7.9262, -14.4112

Open this location on OpenStreetMap →

-7.92622, -14.41120 View on OpenStreetMap →

Georgetown sits at -7.9262°N, 14.4112°W, on the coast of Ascension Island. 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.