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 | Average Sea temperature | Our opinion |
|---|---|---|
| January | 48°F to 50°F | freezing swimming |
| February | 47°F to 48°F | freezing swimming |
| March | 47°F to 48°F | freezing swimming |
| April | 48°F to 49°F | freezing swimming |
| May | 50°F to 52°F | freezing swimming |
| June | 53°F to 54°F | freezing swimming |
| July | 56°F to 58°F | freezing swimming |
| August | 58°F to 59°F | freezing swimming |
| September | 58°F to 59°F | freezing swimming |
| October | 56°F to 58°F | freezing swimming |
| November | 54°F to 56°F | freezing swimming |
| December | 51°F to 52°F | freezing swimming |
Where and when should you swim in Northern Ireland?
Best time to swim in Belfast
No month is favorable as far as sea temperature for swimming in Belfast.
Best time to swim in Ballycastle (Causeway Coast)
No month is favorable as far as sea temperature for swimming in Ballycastle (Causeway Coast).
Best time to swim in Derry (Londonderry)
No month is favorable as far as sea temperature for swimming in Derry (Londonderry).
Best time to swim in Donwpatrick
No month is favorable as far as sea temperature for swimming in Donwpatrick.
Best time to swim in Larne
No month is favorable as far as sea temperature for swimming in Larne.
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.