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South San Diego Bay Sea Temperature in September

California, United States

August South San Diego Bay year-round → October

Average sea temperature for South San Diego Bay, United States across September, based on 10 years of daily readings.

Average

20.76° C

High

23.74° C

Low

17.51° 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 2nd warmest of 12 months at South San Diego Bay. On average the water sits 3.0° than the year-round mean of 17.76° C.

Compared to August, September is 0.2° about the same as (21° C in August). By October the water is usually 19.12° C.

South San Diego Bay Day-by-Day Water Temperature in September

10-year low, average and high

16.5° C
18.6° C
20.8° C
22.9° C
25.0° 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 South San Diego Bay.

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 South San Diego Bay

10-year daily averages

Day Average Low High
September 1 21.19° C 19.41° C 22.59° C
September 2 21.41° C 19.81° C 23.05° C
September 3 21.37° C 19.61° C 23.64° C
September 4 21.39° C 19.47° C 23.74° C
September 5 21.46° C 19.55° C 23.73° C
September 6 21.6° C 20° C 23.64° C
September 7 21.85° C 20.18° C 23.65° C
September 8 21.86° C 20.5° C 23.54° C
September 9 21.68° C 20.33° C 23.22° C
September 10 21.38° C 19.94° C 22.72° C
September 11 21.17° C 19.84° C 22.13° C
September 12 20.98° C 19.67° C 22.14° C
September 13 20.77° C 19.52° C 21.8° C
September 14 20.79° C 19.46° C 21.78° C
September 15 20.91° C 19.72° C 21.94° C
September 16 20.92° C 19.67° C 21.73° C
September 17 20.85° C 19.63° C 21.57° C
September 18 20.73° C 19.65° C 21.59° C
September 19 20.51° C 19.16° C 21.52° C
September 20 20.37° C 19.42° C 21.34° C
September 21 20.34° C 19.71° C 21.08° C
September 22 20.3° C 19.51° C 21.45° C
September 23 20.14° C 19.32° C 21.73° C
September 24 19.98° C 18.81° C 21.47° C
September 25 19.78° C 18.58° C 21.27° C
September 26 19.74° C 18.53° C 21.14° C
September 27 19.72° C 18.31° C 21.2° C
September 28 19.74° C 18.23° C 21.11° C
September 29 19.89° C 17.85° C 21.07° C
September 30 19.9° C 17.51° C 21.03° C

Where September Sits in the Year

September highlighted

11.5° C
15.0° C
18.5° C
22.0° C
25.5° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
15.31° C
15.13° C
15.59° C
16.31° C
17.52° C
18.82° C
20.4° C
21° C
20.76° C
19.12° C
17.18° C
15.94° C
10-year monthly history for South San Diego Bay. 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

South San Diego Bay Location

32.6291, -117.1080

32.62910, -117.10800 View on OpenStreetMap →

South San Diego Bay sits at 32.6291°N, 117.1080°W, on the coast of California, 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 South San Diego Bay