Swimming in Northern Ireland in april 2025 Sea temperature by city in april
Do you want to go to the beach in Northern Ireland in april 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in april in Northern Ireland by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Northern Ireland in april 2025
Here, find the average sea temperature in Northern Ireland in april in several coastal cities.
County Antrim in april
48°F
min: 47°F / max: 50°F
Ballycastle (Causeway Coast)
48°F
min: 46°F / max: 51°F
Larne
48°F
min: 46°F / max: 50°F
Carrickfergus
48°F
min: 47°F / max: 50°F
Glenariff
48°F
min: 46°F / max: 51°F
Newtownabbey
48°F
min: 46°F / max: 50°F
County Londonderry in april
49°F
min: 47°F / max: 51°F
Castlerock
48°F
min: 47°F / max: 51°F
Limavady
49°F
min: 47°F / max: 51°F
49°F
min: 47°F / max: 51°F
County Down in april
Donwpatrick
49°F
min: 46°F / max: 50°F
Annalong
48°F
min: 47°F / max: 50°F
Ballywalter
48°F
min: 46°F / max: 50°F
Bangor
49°F
min: 47°F / max: 50°F
Donaghadee
48°F
min: 47°F / max: 50°F
Dundrum
49°F
min: 46°F / max: 50°F
Where should you go swimming in Northern Ireland in the month of april?
Swimming in Northern Ireland in april is freezing
In april in Northern Ireland swimming conditions are generally the same everywhere.
Forget about swimming in Belfast, Ballycastle (Causeway Coast), Derry (Londonderry), Donwpatrick, Larne, Annalong, Ballywalter, Bangor, Carrickfergus, Castlerock, Donaghadee, Dundrum, Glenariff, Holywood, Kilkeel, Limavady, Millisle, Newcastle, Newtownabbey, Newtownards, Portrush, Portstewart and Warrenpoint in april! The water temperature is freezing, reaching as low as 47°F (and only 50°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!
Where to go swimming in Northern Ireland in april: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in april
Belfast
| April | |||
| Average sea temperature | 48°F | ||
| Minimum sea temperature | 47°F | ||
| Maximum sea temperature | 50°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 54°F | ||
| Minimum outside temperature | 43°F | ||
| Precipitation | 3.3in | ||
| Number of days of precipitation | 5 jour(s) (17%) | ||
| Cloud cover | 55% | ||
| Our opinion | freezing swimming |
More information on swimming in Belfast in april
Ballycastle (Causeway Coast)
| April | |||
| Average sea temperature | 48°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 51°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 52°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 3.7in | ||
| Number of days of precipitation | 7 jour(s) (23%) | ||
| Cloud cover | 52% | ||
| Our opinion | freezing swimming |
Derry (Londonderry)
| April | |||
| Average sea temperature | 49°F | ||
| Minimum sea temperature | 47°F | ||
| Maximum sea temperature | 51°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 54°F | ||
| Minimum outside temperature | 41°F | ||
| Precipitation | 1.6in | ||
| Number of days of precipitation | 2 jour(s) (6%) | ||
| Cloud cover | 59% | ||
| Our opinion | freezing swimming |
More information on swimming in Derry (Londonderry) in april
Donwpatrick
| April | |||
| Average sea temperature | 49°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 50°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 50°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 2.3in | ||
| Number of days of precipitation | 3 jour(s) (11%) | ||
| Cloud cover | 49% | ||
| Our opinion | freezing swimming |
Larne
| April | |||
| Average sea temperature | 48°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 50°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 52°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 3.4in | ||
| Number of days of precipitation | 6 jour(s) (19%) | ||
| Cloud cover | 52% | ||
| Our opinion | freezing swimming |
List of coastal cities in Northern Ireland
| Belfast in april | freezing swimming |
| Ballycastle (Causeway Coast) in april | freezing swimming |
| Derry (Londonderry) in april | freezing swimming |
| Donwpatrick in april | freezing swimming |
| Larne in april | freezing swimming |
| Annalong in april | freezing swimming |
| Ballywalter in april | freezing swimming |
| Bangor in april | freezing swimming |
| Carrickfergus in april | freezing swimming |
| Castlerock in april | freezing swimming |
| Donaghadee in april | freezing swimming |
| Dundrum in april | freezing swimming |
| Glenariff in april | freezing swimming |
| Holywood in april | freezing swimming |
| Kilkeel in april | freezing swimming |
| Limavady in april | freezing swimming |
| Millisle in april | freezing swimming |
| Newcastle in april | freezing swimming |
| Newtownabbey in april | freezing swimming |
| Newtownards in april | freezing swimming |
| Portrush in april | freezing swimming |
| Portstewart in april | freezing swimming |
| Warrenpoint in april | freezing swimming |