Swimming in Northern Ireland in july 2025 Sea temperature by city in july
Do you want to go to the beach in Northern Ireland in july 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 july in Northern Ireland by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Northern Ireland in july 2025
Here, find the average sea temperature in Northern Ireland in july in several coastal cities.
County Antrim in july
57°F
min: 54°F / max: 60°F
Ballycastle (Causeway Coast)
56°F
min: 54°F / max: 59°F
Larne
57°F
min: 54°F / max: 60°F
Carrickfergus
57°F
min: 54°F / max: 60°F
Glenariff
56°F
min: 54°F / max: 59°F
Newtownabbey
57°F
min: 54°F / max: 60°F
County Londonderry in july
57°F
min: 55°F / max: 60°F
Castlerock
57°F
min: 54°F / max: 59°F
Limavady
57°F
min: 54°F / max: 59°F
56°F
min: 54°F / max: 59°F
County Down in july
Donwpatrick
57°F
min: 55°F / max: 60°F
Annalong
58°F
min: 55°F / max: 60°F
Ballywalter
57°F
min: 54°F / max: 60°F
Bangor
57°F
min: 54°F / max: 60°F
Donaghadee
57°F
min: 54°F / max: 60°F
Dundrum
58°F
min: 55°F / max: 60°F
Where should you go swimming in Northern Ireland in the month of july?
Swimming in Northern Ireland in july is freezing
In july 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 july! The water temperature is freezing, reaching as low as 54°F (and only 60°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 july: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in july
Belfast
| July | |||
| Average sea temperature | 57°F | ||
| Minimum sea temperature | 54°F | ||
| Maximum sea temperature | 60°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 65°F | ||
| Minimum outside temperature | 56°F | ||
| Precipitation | 5.1in | ||
| Number of days of precipitation | 9 jour(s) (30%) | ||
| Cloud cover | 58% | ||
| Our opinion | freezing swimming |
More information on swimming in Belfast in july
Ballycastle (Causeway Coast)
| July | |||
| Average sea temperature | 56°F | ||
| Minimum sea temperature | 54°F | ||
| Maximum sea temperature | 59°F | ||
| Average outside temperature | 59°F | ||
| Maximum outside temperature | 61°F | ||
| Minimum outside temperature | 56°F | ||
| Precipitation | 6.7in | ||
| Number of days of precipitation | 12 jour(s) (40%) | ||
| Cloud cover | 57% | ||
| Our opinion | freezing swimming |
Derry (Londonderry)
| July | |||
| Average sea temperature | 57°F | ||
| Minimum sea temperature | 55°F | ||
| Maximum sea temperature | 60°F | ||
| Average outside temperature | 59°F | ||
| Maximum outside temperature | 65°F | ||
| Minimum outside temperature | 56°F | ||
| Precipitation | 3.1in | ||
| Number of days of precipitation | 6 jour(s) (18%) | ||
| Cloud cover | 69% | ||
| Our opinion | freezing swimming |
More information on swimming in Derry (Londonderry) in july
Donwpatrick
| July | |||
| Average sea temperature | 57°F | ||
| Minimum sea temperature | 55°F | ||
| Maximum sea temperature | 60°F | ||
| Average outside temperature | 59°F | ||
| Maximum outside temperature | 63°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 3.3in | ||
| Number of days of precipitation | 5 jour(s) (17%) | ||
| Cloud cover | 51% | ||
| Our opinion | freezing swimming |
Larne
| July | |||
| Average sea temperature | 57°F | ||
| Minimum sea temperature | 54°F | ||
| Maximum sea temperature | 60°F | ||
| Average outside temperature | 59°F | ||
| Maximum outside temperature | 63°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 5.6in | ||
| Number of days of precipitation | 10 jour(s) (33%) | ||
| Cloud cover | 56% | ||
| Our opinion | freezing swimming |
List of coastal cities in Northern Ireland
| Belfast in july | freezing swimming |
| Ballycastle (Causeway Coast) in july | freezing swimming |
| Derry (Londonderry) in july | freezing swimming |
| Donwpatrick in july | freezing swimming |
| Larne in july | freezing swimming |
| Annalong in july | freezing swimming |
| Ballywalter in july | freezing swimming |
| Bangor in july | freezing swimming |
| Carrickfergus in july | freezing swimming |
| Castlerock in july | freezing swimming |
| Donaghadee in july | freezing swimming |
| Dundrum in july | freezing swimming |
| Glenariff in july | freezing swimming |
| Holywood in july | freezing swimming |
| Kilkeel in july | freezing swimming |
| Limavady in july | freezing swimming |
| Millisle in july | freezing swimming |
| Newcastle in july | freezing swimming |
| Newtownabbey in july | freezing swimming |
| Newtownards in july | freezing swimming |
| Portrush in july | freezing swimming |
| Portstewart in july | freezing swimming |
| Warrenpoint in july | freezing swimming |