Thunder Bay Sea Temperature in September

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

Average water temperature in Thunder Bay for September

The average, high, and low temperatures below should help you if you can swim in the water in Thunder Bay in September.

13.86° C

(56.95° F)

highest: 19.32° C (66.78° F)
lowest: 8.92° C (48.06° F)

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a very big risk.

Water temperature range by day in September in Thunder Bay

The chart below shows the range of low and high temperatures by day for the month of September in Thunder Bay.

Water temperatures for September in Thunder Bay in recent years

Day	2024	2023	2022	2021
1	0° C	15.37° C	14.65° C	16.6° C
2	0° C	14.88° C	14.88° C	16.6° C
3	0° C	15.41° C	13.95° C	16.59° C
4	0° C	16.29° C	13.72° C	16.65° C
5	0° C	16.9° C	13.89° C	16.56° C
6	0° C	17.87° C	14.34° C	16.48° C
7	0° C	16.84° C	14.87° C	16.02° C
8	0° C	16.85° C	15.02° C	14.94° C
9	0° C	16.51° C	15.21° C	14.78° C
10	0° C	16.29° C	14.79° C	14.68° C
11	0° C	16.21° C	14.66° C	14.75° C
12	0° C	15.93° C	14.84° C	15.15° C
13	0° C	15.67° C	14.94° C	15.25° C
14	0° C	15.54° C	14.91° C	15.05° C
15	0° C	15.58° C	14.88° C	14.98° C
16	0° C	15.48° C	14.86° C	15.58° C
17	0° C	15.48° C	14.66° C	15.22° C
18	0° C	15.44° C	14.5° C	15.1° C
19	0° C	15.46° C	14.43° C	15.43° C
20	0° C	15.68° C	14.64° C	15.79° C
21	0° C	16.01° C	14.55° C	14.98° C
22	0° C	16.04° C	14.34° C	14.8° C
23	0° C	16.05° C	14.09° C	14.87° C
24	0° C	16.06° C	13.73° C	14.87° C
25	0° C	15.95° C	13.37° C	14.79° C
26	0° C	15.86° C	13.13° C	14° C
27	0° C	15.9° C	12.84° C	13.63° C
28	0° C	15.98° C	12.78° C	13.7° C
29	0° C	15.98° C	12.66° C	13.7° C
30	0° C	16.11° C	12.57° C	14.05° C

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Thunder Bay 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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