Swimming in Northern Ireland in march 2025 Sea temperature by city in march
Do you want to go to the beach in Northern Ireland in march 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 march in Northern Ireland by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Northern Ireland in march 2025
Here, find the average sea temperature in Northern Ireland in march in several coastal cities.
County Antrim in march
47°F
min: 45°F / max: 49°F
Ballycastle (Causeway Coast)
47°F
min: 46°F / max: 49°F
Larne
47°F
min: 45°F / max: 49°F
Carrickfergus
47°F
min: 45°F / max: 49°F
Glenariff
47°F
min: 46°F / max: 49°F
Newtownabbey
47°F
min: 45°F / max: 49°F
County Londonderry in march
48°F
min: 46°F / max: 50°F
Castlerock
48°F
min: 46°F / max: 49°F
Limavady
48°F
min: 46°F / max: 50°F
48°F
min: 46°F / max: 49°F
County Down in march
Donwpatrick
47°F
min: 45°F / max: 49°F
Annalong
47°F
min: 45°F / max: 49°F
Ballywalter
47°F
min: 44°F / max: 49°F
Bangor
47°F
min: 45°F / max: 49°F
Donaghadee
47°F
min: 45°F / max: 49°F
Dundrum
47°F
min: 45°F / max: 49°F
Where should you go swimming in Northern Ireland in the month of march?
Swimming in Northern Ireland in march is freezing
In march 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 march! The water temperature is freezing, reaching as low as 45°F (and only 49°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 march: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in march
Belfast
| March | |||
| Average sea temperature | 47°F | ||
| Minimum sea temperature | 45°F | ||
| Maximum sea temperature | 49°F | ||
| Average outside temperature | 45°F | ||
| Maximum outside temperature | 49°F | ||
| Minimum outside temperature | 40°F | ||
| Precipitation | 3.9in | ||
| Number of days of precipitation | 6 jour(s) (21%) | ||
| Cloud cover | 61% | ||
| Our opinion | freezing swimming |
More information on swimming in Belfast in march
Ballycastle (Causeway Coast)
| March | |||
| Average sea temperature | 47°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 49°F | ||
| Average outside temperature | 45°F | ||
| Maximum outside temperature | 49°F | ||
| Minimum outside temperature | 43°F | ||
| Precipitation | 4.4in | ||
| Number of days of precipitation | 7 jour(s) (24%) | ||
| Cloud cover | 61% | ||
| Our opinion | freezing swimming |
Derry (Londonderry)
| March | |||
| Average sea temperature | 48°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 50°F | ||
| Average outside temperature | 45°F | ||
| Maximum outside temperature | 49°F | ||
| Minimum outside temperature | 40°F | ||
| Precipitation | 1.9in | ||
| Number of days of precipitation | 2 jour(s) (8%) | ||
| Cloud cover | 66% | ||
| Our opinion | freezing swimming |
More information on swimming in Derry (Londonderry) in march
Donwpatrick
| March | |||
| Average sea temperature | 47°F | ||
| Minimum sea temperature | 45°F | ||
| Maximum sea temperature | 49°F | ||
| Average outside temperature | 47°F | ||
| Maximum outside temperature | 49°F | ||
| Minimum outside temperature | 43°F | ||
| Precipitation | 2.5in | ||
| Number of days of precipitation | 4 jour(s) (13%) | ||
| Cloud cover | 55% | ||
| Our opinion | freezing swimming |
Larne
| March | |||
| Average sea temperature | 47°F | ||
| Minimum sea temperature | 45°F | ||
| Maximum sea temperature | 49°F | ||
| Average outside temperature | 45°F | ||
| Maximum outside temperature | 49°F | ||
| Minimum outside temperature | 41°F | ||
| Precipitation | 3.9in | ||
| Number of days of precipitation | 7 jour(s) (22%) | ||
| Cloud cover | 59% | ||
| Our opinion | freezing swimming |
List of coastal cities in Northern Ireland
| Belfast in march | freezing swimming |
| Ballycastle (Causeway Coast) in march | freezing swimming |
| Derry (Londonderry) in march | freezing swimming |
| Donwpatrick in march | freezing swimming |
| Larne in march | freezing swimming |
| Annalong in march | freezing swimming |
| Ballywalter in march | freezing swimming |
| Bangor in march | freezing swimming |
| Carrickfergus in march | freezing swimming |
| Castlerock in march | freezing swimming |
| Donaghadee in march | freezing swimming |
| Dundrum in march | freezing swimming |
| Glenariff in march | freezing swimming |
| Holywood in march | freezing swimming |
| Kilkeel in march | freezing swimming |
| Limavady in march | freezing swimming |
| Millisle in march | freezing swimming |
| Newcastle in march | freezing swimming |
| Newtownabbey in march | freezing swimming |
| Newtownards in march | freezing swimming |
| Portrush in march | freezing swimming |
| Portstewart in march | freezing swimming |
| Warrenpoint in march | freezing swimming |