Castletown Sea Temperature

Looking to find out what the sea water temperature in Castletown is for today and the next few days? Below are data and charts that will give you information about sea temperatures in Castletown and nearby locations.

Water temperature in Castletown right now

Below is the current sea temperature for Castletown, Isle of Man on 29th March 2024.

8.97° C

(48.14° F)

  • yesterday: 9.05° C (48.29° F)
  • a week ago: 9.04° C (48.27° F)

This water is very cold and can cause pain. We don't recommend you swim in this temperature for anything other than very short swims of 5 to 10 minutes unless you are a very experienced cold water swimmer.

The average sea temperature for Castletown on March 29th over the last 10 years is 8.08° C (46.55° F), with a low temperature of 6.31° C (43.36° F) and a high of 9.18° C (48.52° F).

Analysis and forecast for Castletown water temperatures

The water temperature in Castletown today is higher than the average temperature of 8.08° C (46.55° F) and the temperature on this day last year, 29th March 2023, was 8.93° C (48.07° F).

The chart and table below shows the change in water temperature in Castletown over the last 30 days:

Date Temperature (Celsius) Temperature (Fahrenheit)
March 29 8.97° C 48.14° F
March 28 9.05° C 48.29° F
March 27 9.15° C 48.47° F
March 26 8.87° C 47.97° F
March 25 8.94° C 48.09° F
March 24 9.03° C 48.25° F
March 23 8.97° C 48.15° F
March 22 9.04° C 48.27° F
March 21 8.99° C 48.18° F
March 20 9.11° C 48.4° F
March 19 8.92° C 48.06° F
March 18 8.86° C 47.95° F
March 17 8.91° C 48.04° F
March 16 8.88° C 47.98° F
March 15 8.69° C 47.64° F
March 14 8.82° C 47.88° F
March 13 8.3° C 46.94° F
March 12 8.38° C 47.08° F
March 11 8.42° C 47.16° F
March 10 8.56° C 47.41° F
March 9 8.65° C 47.57° F
March 8 8.67° C 47.61° F
March 7 8.84° C 47.91° F
March 6 8.67° C 47.61° F
March 5 8.63° C 47.53° F
March 4 8.54° C 47.37° F
March 3 8.51° C 47.32° F
March 2 8.6° C 47.48° F
March 1 8.71° C 47.68° F
February 29 8.72° C 47.7° F
February 28 8.58° C 47.44° F

The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.

Water temperature in Castletown by month

The chart below shows the monthly average water temperature in Castletown.

For more detailed information on how the sea temperature in Castletown changes for each month of the year, choose from the months below.

Castletown map and nearby water temperatures

Locations near Castletown

The highest temperature in Isle of Man today is 9.01° C (48.21° F) in Port Erin. The lowest is in Maughold, where the temperature of the water is 8.22° C (46.79° F).

Why measure sea surface temperatures (SST) in Castletown?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Castletown because they want to understand and learn how the ocean communicates with the atomosphere of Earth.

SST is one measure that provides information on the global climate, and it can be used to predict the weather in Castletown as well as atmospheric model simulations and to study marine ecosystems in the area.

Data source and citation

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

  • "Castletown Sea Temperature". SeaTemperatures.net. Accessed on March 29, 2024. http://seatemperatures.net/europe/isle-of-man/castletown/.

  • "Castletown Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/europe/isle-of-man/castletown/. Accessed 29 March, 2024

  • Castletown Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/europe/isle-of-man/castletown/.