Swimming in Northern Ireland in november 2025 Sea temperature by city in november
Do you want to go to the beach in Northern Ireland in november 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 november in Northern Ireland by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Northern Ireland in november 2025
Here, find the average sea temperature in Northern Ireland in november in several coastal cities.
County Antrim in november
54°F
min: 53°F / max: 56°F
Ballycastle (Causeway Coast)
54°F
min: 52°F / max: 57°F
Larne
55°F
min: 52°F / max: 56°F
Carrickfergus
55°F
min: 52°F / max: 57°F
Glenariff
54°F
min: 52°F / max: 57°F
Newtownabbey
55°F
min: 52°F / max: 56°F
County Londonderry in november
54°F
min: 53°F / max: 56°F
Castlerock
55°F
min: 52°F / max: 57°F
Limavady
55°F
min: 53°F / max: 56°F
55°F
min: 52°F / max: 56°F
County Down in november
Donwpatrick
55°F
min: 54°F / max: 58°F
Annalong
55°F
min: 54°F / max: 58°F
Ballywalter
55°F
min: 53°F / max: 57°F
Bangor
54°F
min: 53°F / max: 57°F
Donaghadee
55°F
min: 53°F / max: 57°F
Dundrum
55°F
min: 54°F / max: 57°F
Where should you go swimming in Northern Ireland in the month of november?
Swimming in Northern Ireland in november is freezing
In november 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 november! The water temperature is freezing, reaching as low as 53°F (and only 56°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 november: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in november
Belfast
| November | |||
| Average sea temperature | 54°F | ||
| Minimum sea temperature | 53°F | ||
| Maximum sea temperature | 56°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 50°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 4.8in | ||
| Number of days of precipitation | 7 jour(s) (25%) | ||
| Cloud cover | 61% | ||
| Our opinion | freezing swimming |
More information on swimming in Belfast in november
Ballycastle (Causeway Coast)
| November | |||
| Average sea temperature | 54°F | ||
| Minimum sea temperature | 52°F | ||
| Maximum sea temperature | 57°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 50°F | ||
| Minimum outside temperature | 47°F | ||
| Precipitation | 6.5in | ||
| Number of days of precipitation | 11 jour(s) (37%) | ||
| Cloud cover | 63% | ||
| Our opinion | freezing swimming |
Derry (Londonderry)
| November | |||
| Average sea temperature | 54°F | ||
| Minimum sea temperature | 53°F | ||
| Maximum sea temperature | 56°F | ||
| Average outside temperature | 47°F | ||
| Maximum outside temperature | 49°F | ||
| Minimum outside temperature | 43°F | ||
| Precipitation | 2.5in | ||
| Number of days of precipitation | 3 jour(s) (12%) | ||
| Cloud cover | 68% | ||
| Our opinion | freezing swimming |
More information on swimming in Derry (Londonderry) in november
Donwpatrick
| November | |||
| Average sea temperature | 55°F | ||
| Minimum sea temperature | 54°F | ||
| Maximum sea temperature | 58°F | ||
| Average outside temperature | 50°F | ||
| Maximum outside temperature | 52°F | ||
| Minimum outside temperature | 49°F | ||
| Precipitation | 3.9in | ||
| Number of days of precipitation | 6 jour(s) (21%) | ||
| Cloud cover | 57% | ||
| Our opinion | freezing swimming |
Larne
| November | |||
| Average sea temperature | 55°F | ||
| Minimum sea temperature | 52°F | ||
| Maximum sea temperature | 56°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 50°F | ||
| Minimum outside temperature | 47°F | ||
| Precipitation | 4.8in | ||
| Number of days of precipitation | 7 jour(s) (24%) | ||
| Cloud cover | 61% | ||
| Our opinion | freezing swimming |
List of coastal cities in Northern Ireland
| Belfast in november | freezing swimming |
| Ballycastle (Causeway Coast) in november | freezing swimming |
| Derry (Londonderry) in november | freezing swimming |
| Donwpatrick in november | freezing swimming |
| Larne in november | freezing swimming |
| Annalong in november | freezing swimming |
| Ballywalter in november | freezing swimming |
| Bangor in november | freezing swimming |
| Carrickfergus in november | freezing swimming |
| Castlerock in november | freezing swimming |
| Donaghadee in november | freezing swimming |
| Dundrum in november | freezing swimming |
| Glenariff in november | freezing swimming |
| Holywood in november | freezing swimming |
| Kilkeel in november | freezing swimming |
| Limavady in november | freezing swimming |
| Millisle in november | freezing swimming |
| Newcastle in november | freezing swimming |
| Newtownabbey in november | freezing swimming |
| Newtownards in november | freezing swimming |
| Portrush in november | freezing swimming |
| Portstewart in november | freezing swimming |
| Warrenpoint in november | freezing swimming |