Port Saint Johns Sea Temperature in September

Looking to find out what the average sea water temperature in Port Saint Johns is for September? Find out what the lowest, highest, and average water temperatures are for Port Saint Johns over the past 10 years.

Average water temperature in Port Saint Johns for September

The average, high, and low temperatures below should help you if you can swim in the water in Port Saint Johns in September.

21.82° C

(71.27° F)

highest: 23.58° C (74.44° F)
lowest: 20.35° C (68.63° F)

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

Water temperature range by day in September in Port Saint Johns

The chart below shows the range of low and high temperatures by day for the month of September in Port Saint Johns.

Water temperatures for September in Port Saint Johns in recent years

Day	2024	2023	2022	2021
1	0° C	21.55° C	21° C	21.11° C
2	0° C	21.03° C	21.17° C	21.19° C
3	0° C	21.25° C	21.26° C	20.99° C
4	0° C	21.96° C	21.31° C	20.87° C
5	0° C	21.47° C	21.18° C	20.91° C
6	0° C	21.43° C	21.16° C	20.94° C
7	0° C	21.42° C	21.07° C	21.57° C
8	0° C	21.64° C	21.22° C	21.76° C
9	0° C	22.28° C	21.27° C	21.62° C
10	0° C	21.77° C	21.36° C	21.89° C
11	0° C	21.36° C	21.34° C	22.19° C
12	0° C	21.11° C	21.31° C	21.87° C
13	0° C	20.82° C	21.36° C	21.24° C
14	0° C	20.67° C	21.48° C	21.36° C
15	0° C	21° C	21.71° C	21.86° C
16	0° C	21.25° C	21.95° C	21.92° C
17	0° C	21.33° C	21.97° C	21.66° C
18	0° C	21.5° C	21.72° C	21.57° C
19	0° C	21.65° C	21.62° C	21.5° C
20	0° C	21.68° C	21.69° C	21.57° C
21	0° C	21.76° C	21.82° C	21.87° C
22	0° C	21.77° C	21.98° C	21.84° C
23	0° C	21.75° C	21.9° C	21.72° C
24	0° C	21.53° C	21.82° C	21.74° C
25	0° C	21.43° C	21.95° C	21.94° C
26	0° C	21.24° C	22° C	21.91° C
27	0° C	21.32° C	21.98° C	21.7° C
28	0° C	21.5° C	21.92° C	21.52° C
29	0° C	21.81° C	21.9° C	21.53° C
30	0° C	21.97° C	21.78° C	21.56° C

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Port Saint Johns comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.

The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.

If you'd like to use any of the information above in the format it is presented, please use the citation tool below.

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