Cornwall Sea Temperature in September

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

Average water temperature in Cornwall for September

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

17.54° C

(63.57° F)

  • highest: 20.72° C (69.3° F)
  • lowest: 14.95° C (58.91° F)

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

Water temperature range by day in September in Cornwall

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

Water temperatures for September in Cornwall in recent years

Day 2024 2023 2022 2021
1 0° C 18.14° C 20.59° C 20.65° C
2 0° C 17.88° C 20.55° C 20.72° C
3 0° C 17.88° C 20.3° C 20.7° C
4 0° C 17.87° C 20.07° C 20.55° C
5 0° C 17.99° C 19.74° C 20.4° C
6 0° C 18.12° C 19.62° C 20.17° C
7 0° C 18.33° C 19.65° C 19.05° C
8 0° C 18.97° C 19.73° C 19.13° C
9 0° C 18.9° C 19.97° C 19.23° C
10 0° C 19.29° C 19.89° C 19.11° C
11 0° C 19.35° C 19.72° C 18.76° C
12 0° C 19° C 19.66° C 18.59° C
13 0° C 18.8° C 19.68° C 18.48° C
14 0° C 19.1° C 19.8° C 17.64° C
15 0° C 19.4° C 19.53° C 17.26° C
16 0° C 19.05° C 19.3° C 17.5° C
17 0° C 18.6° C 18.33° C 17.95° C
18 0° C 18.23° C 17.78° C 17.98° C
19 0° C 17.74° C 17.56° C 17.87° C
20 0° C 17.47° C 17.24° C 17.57° C
21 0° C 17.18° C 16.91° C 17.53° C
22 0° C 16.91° C 16.54° C 17.54° C
23 0° C 16.65° C 16.48° C 17.78° C
24 0° C 16.58° C 16.25° C 18.24° C
25 0° C 16.61° C 16.39° C 18.27° C
26 0° C 16.47° C 16.24° C 18.07° C
27 0° C 16.18° C 16.01° C 17.98° C
28 0° C 16.17° C 15.97° C 17.96° C
29 0° C 16.43° C 15.94° C 17.5° C
30 0° C 16.62° C 15.97° C 17.1° C

Water temperature in September for locations near Cornwall

Charlottetown

Canada, North America

4.15 miles away

Hojo

Japan, Asia

4.23 miles away

Brackley Beach

Canada, North America

12.21 miles away

North Rustico

Canada, North America

16.46 miles away

Cavendish Beach

Canada, North America

19.66 miles away

Northumberland Strait

Canada, North America

24.28 miles away

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Cornwall 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.

  • "Cornwall Sea Temperature in September". SeaTemperatures.net. Accessed on May 5, 2024. http://seatemperatures.net/north-america/canada/cornwall-september-temperature/.

  • "Cornwall Sea Temperature in September". SeaTemperatures.net, http://seatemperatures.net/north-america/canada/cornwall-september-temperature/. Accessed 5 May, 2024

  • Cornwall Sea Temperature in September. SeaTemperatures.net. Retrieved from http://seatemperatures.net/north-america/canada/cornwall-september-temperature/.