Swimming in Northern Ireland in january 2025 Sea temperature by city in january
Do you want to go to the beach in Northern Ireland in january 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 january in Northern Ireland by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Northern Ireland in january 2025
Here, find the average sea temperature in Northern Ireland in january in several coastal cities.
County Antrim
48°F
min: 46°F / max: 51°F
Ballycastle (Causeway Coast)
49°F
min: 47°F / max: 50°F
Larne
48°F
min: 46°F / max: 50°F
Carrickfergus
49°F
min: 46°F / max: 51°F
Glenariff
49°F
min: 46°F / max: 51°F
Newtownabbey
48°F
min: 46°F / max: 50°F
County Londonderry
50°F
min: 48°F / max: 52°F
Castlerock
49°F
min: 47°F / max: 51°F
Limavady
49°F
min: 48°F / max: 51°F
49°F
min: 47°F / max: 51°F
County Down
Donwpatrick
49°F
min: 47°F / max: 51°F
Annalong
49°F
min: 46°F / max: 51°F
Ballywalter
48°F
min: 46°F / max: 51°F
Bangor
49°F
min: 46°F / max: 51°F
Donaghadee
49°F
min: 46°F / max: 51°F
Dundrum
49°F
min: 47°F / max: 52°F
Where should you go swimming in Northern Ireland in the month of january?
Swimming in Northern Ireland in january is freezing
In january 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 january! The water temperature is freezing, reaching as low as 46°F (and only 51°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 january: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in january
Belfast
| January | |||
| Average sea temperature | 48°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 51°F | ||
| Average outside temperature | 43°F | ||
| Maximum outside temperature | 45°F | ||
| Minimum outside temperature | 40°F | ||
| Precipitation | 4.3in | ||
| Number of days of precipitation | 7 jour(s) (24%) | ||
| Cloud cover | 63% | ||
| Our opinion | freezing swimming |
More information on swimming in Belfast in january
Ballycastle (Causeway Coast)
| January | |||
| Average sea temperature | 49°F | ||
| Minimum sea temperature | 47°F | ||
| Maximum sea temperature | 50°F | ||
| Average outside temperature | 43°F | ||
| Maximum outside temperature | 47°F | ||
| Minimum outside temperature | 41°F | ||
| Precipitation | 5.5in | ||
| Number of days of precipitation | 10 jour(s) (31%) | ||
| Cloud cover | 64% | ||
| Our opinion | freezing swimming |
Derry (Londonderry)
| January | |||
| Average sea temperature | 50°F | ||
| Minimum sea temperature | 48°F | ||
| Maximum sea temperature | 52°F | ||
| Average outside temperature | 41°F | ||
| Maximum outside temperature | 45°F | ||
| Minimum outside temperature | 38°F | ||
| Precipitation | 2.4in | ||
| Number of days of precipitation | 3 jour(s) (10%) | ||
| Cloud cover | 68% | ||
| Our opinion | freezing swimming |
More information on swimming in Derry (Londonderry) in january
Donwpatrick
| January | |||
| Average sea temperature | 49°F | ||
| Minimum sea temperature | 47°F | ||
| Maximum sea temperature | 51°F | ||
| Average outside temperature | 45°F | ||
| Maximum outside temperature | 47°F | ||
| Minimum outside temperature | 43°F | ||
| Precipitation | 3.3in | ||
| Number of days of precipitation | 5 jour(s) (18%) | ||
| Cloud cover | 59% | ||
| Our opinion | freezing swimming |
Larne
| January | |||
| Average sea temperature | 48°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 50°F | ||
| Average outside temperature | 45°F | ||
| Maximum outside temperature | 47°F | ||
| Minimum outside temperature | 41°F | ||
| Precipitation | 4.4in | ||
| Number of days of precipitation | 7 jour(s) (24%) | ||
| Cloud cover | 62% | ||
| Our opinion | freezing swimming |
List of coastal cities in Northern Ireland
| Belfast in january | freezing swimming |
| Ballycastle (Causeway Coast) in january | freezing swimming |
| Derry (Londonderry) in january | freezing swimming |
| Donwpatrick in january | freezing swimming |
| Larne in january | freezing swimming |
| Annalong in january | freezing swimming |
| Ballywalter in january | freezing swimming |
| Bangor in january | freezing swimming |
| Carrickfergus in january | freezing swimming |
| Castlerock in january | freezing swimming |
| Donaghadee in january | freezing swimming |
| Dundrum in january | freezing swimming |
| Glenariff in january | freezing swimming |
| Holywood in january | freezing swimming |
| Kilkeel in january | freezing swimming |
| Limavady in january | freezing swimming |
| Millisle in january | freezing swimming |
| Newcastle in january | freezing swimming |
| Newtownabbey in january | freezing swimming |
| Newtownards in january | freezing swimming |
| Portrush in january | freezing swimming |
| Portstewart in january | freezing swimming |
| Warrenpoint in january | freezing swimming |