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French Frigate Shoals Sea Temperature in September

Hawaii, United States

August French Frigate Shoals year-round → October

Average sea temperature for French Frigate Shoals, United States across September, based on 10 years of daily readings.

Average

27.67° C

High

28.44° C

Low

26.57° 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.

September is the 1st warmest of 12 months at French Frigate Shoals. On average the water sits 1.9° than the year-round mean of 25.74° C.

Compared to August, September is 0.3° warmer than (27.36° C in August). By October the water is usually 27.25° C.

French Frigate Shoals Day-by-Day Water Temperature in September

10-year low, average and high

26.0° C
26.8° C
27.5° C
28.3° C
29.0° 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 French Frigate Shoals.

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 French Frigate Shoals

10-year daily averages

Day Average Low High
September 1 27.55° C 27.04° C 28.33° C
September 2 27.59° C 27.08° C 28.3° C
September 3 27.68° C 27.11° C 28.29° C
September 4 27.66° C 27.16° C 28.2° C
September 5 27.71° C 27.26° C 28.28° C
September 6 27.77° C 27.25° C 28.37° C
September 7 27.78° C 27.25° C 28.34° C
September 8 27.77° C 27.25° C 28.31° C
September 9 27.72° C 27.2° C 28.31° C
September 10 27.7° C 27.16° C 28.28° C
September 11 27.69° C 27.15° C 28.25° C
September 12 27.62° C 26.98° C 28.05° C
September 13 27.64° C 26.95° C 28.09° C
September 14 27.66° C 27.05° C 28.17° C
September 15 27.7° C 27.16° C 28.34° C
September 16 27.78° C 27.41° C 28.26° C
September 17 27.85° C 27.42° C 28.31° C
September 18 27.83° C 27.44° C 28.32° C
September 19 27.69° C 27.44° C 28.11° C
September 20 27.68° C 27.46° C 28.04° C
September 21 27.67° C 27.42° C 27.97° C
September 22 27.66° C 27.39° C 28.03° C
September 23 27.65° C 27.34° C 28.09° C
September 24 27.65° C 27.31° C 28.34° C
September 25 27.61° C 27.09° C 28.44° C
September 26 27.48° C 26.57° C 28.13° C
September 27 27.52° C 26.64° C 28.14° C
September 28 27.54° C 26.82° C 28.06° C
September 29 27.57° C 26.8° C 28.05° C
September 30 27.6° C 26.71° C 28.11° C

Where September Sits in the Year

September highlighted

21.5° C
23.6° C
25.8° C
27.9° C
30.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
24.67° C
24.04° C
23.86° C
24.12° C
25.11° C
26.43° C
26.83° C
27.36° C
27.67° C
27.25° C
26.22° C
25.28° C
10-year monthly history for French Frigate Shoals. 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

French Frigate Shoals Location

23.8667, -166.2830

23.86670, -166.28301 View on OpenStreetMap →

French Frigate Shoals sits at 23.8667°N, 166.2830°W, on the coast of Hawaii, 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 French Frigate Shoals