Best time to swim in Northern Ireland Sea temperature by month

Do you want to go to the seaside in Northern Ireland? But when should you go to be sure to enjoy good sea water temperature and be able to swim for a long time? Now or another month during the year? On this page, find the sea temperature by month in Northern Ireland.

Swimming in Northern Ireland by month

Discover swimming conditions in detail in Northern Ireland by month below. Click on the links for each month to see details about the sea temperature in the cities of: Belfast, Ballycastle (Causeway Coast), Derry (Londonderry), Donwpatrick and Larne.

Month sea temperature Details
48°F to 50°F Sea temperature
in Northern Ireland in january
47°F to 48°F Sea temperature
in Northern Ireland in february
47°F to 48°F Sea temperature
in Northern Ireland in march
48°F to 49°F Sea temperature
in Northern Ireland in april
50°F to 52°F Sea temperature
in Northern Ireland in may
53°F to 54°F Sea temperature
in Northern Ireland in june
56°F to 57°F Sea temperature
in Northern Ireland in july
58°F to 59°F Sea temperature
in Northern Ireland in august
58°F to 59°F Sea temperature
in Northern Ireland in september
56°F to 58°F Sea temperature
in Northern Ireland in october
54°F to 56°F Sea temperature
in Northern Ireland in november
51°F to 52°F Sea temperature
in Northern Ireland in december

Where and when should you swim in Northern Ireland?

Belfast

Best time to swim in Belfast

No month is favorable as far as sea temperature for swimming in Belfast.

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Ballycastle (Causeway Coast)

Best time to swim in Ballycastle (Causeway Coast)

No month is favorable as far as sea temperature for swimming in Ballycastle (Causeway Coast).

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Derry (Londonderry)

Best time to swim in Derry (Londonderry)

No month is favorable as far as sea temperature for swimming in Derry (Londonderry).

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Donwpatrick

Best time to swim in Donwpatrick

No month is favorable as far as sea temperature for swimming in Donwpatrick.

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Larne

Best time to swim in Larne

No month is favorable as far as sea temperature for swimming in Larne.

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Other cities and places in Northern Ireland:

Water temperatures in Northern Ireland over the entire year

On this chart, we show you the variation of the average sea water temperature in Northern Ireland for the cities of: Belfast, Ballycastle (Causeway Coast), Derry (Londonderry), Donwpatrick and Larne.

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