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Irish Sea

Irish Sea Water Temperature: Current & Historical Data for Coastal Resorts

We find every spot where you can swim and tell you what the water temperature is there today and throughout the year

Current water temperature

45°F

minimal

47°F

average

48°F

maximum

Graph of Water Temperature Changes in the Irish Sea Over the Last 60 Days

Water temperature in the Irish Sea by month

Month	Minimum	Maximum
January	45°F	52°F
February	43°F	50°F
March	43°F	52°F
April	45°F	54°F
May	45°F	57°F
June	48°F	63°F
July	50°F	66°F
August	54°F	66°F
September	54°F	64°F
October	52°F	61°F
November	50°F	59°F
December	46°F	55°F

What is known about the Irish Sea?

The Irish Sea, situated between Ireland and Great Britain, experiences a temperate maritime climate, with relatively cooler water temperatures compared to more tropical regions. During the winter months, from December to February, water temperatures typically range from 39–42°F (4–6°C), making it too cold for comfortable swimming without wetsuits. In the summer, from June to August, the water warms up to around 55–63°F (13–17°C), which is still quite cool for many swimmers, though more tolerable for short swims or water sports.

Swimming in the Irish Sea is popular, especially along the coasts of Wales, England, and Ireland, although the cold temperatures often lead people to wear wetsuits for comfort and safety. The region is known for its surfing and windsurfing opportunities, particularly along beaches in Cornwall and Northern Ireland. In addition to these activities, the calm waters near sheltered bays and beaches can provide good conditions for swimming during the warmer months. While the cool water may limit swimming to certain times of the year or require proper gear, the Irish Sea offers a variety of coastal activities, making it a favorite for outdoor enthusiasts.

List of Countries Bordering the Irish Sea

Popular Resorts of the Irish Sea with the Warmest Water Today

48°F

Duncannon

Ireland

48°F

Carnivan

Ireland

48°F

Portballintrae

United Kingdom

48°F

Portstewart

United Kingdom

48°F

Castlerock

United Kingdom

48°F

Dunseverick

United Kingdom

Popular Resorts on the Irish Sea Coast

Nearest Seas and Oceans

Frequently Asked Questions About the Irish Sea

What is the water temperature in the Irish Sea right now?

The water temperature in the Irish Sea today ranges from 46°F (8°C) in Donaghadee (United Kingdom) to 48°F (9°C) in Portstewart (United Kingdom).

Is it possible to swim in the Irish Sea?

Yes, it is possible to swim in the Irish Sea, although the water can be quite chilly, especially in the colder months.

In which month does the Irish Sea have the highest and lowest water temperatures?

The highest water temperature in the Irish Sea occurs in July, reaching 66°F (19°C), while the lowest is in February, dropping to 43°F (6°C).

Is the Irish Sea colder than the English Channel?

Yes, the Irish Sea is slightly colder than the English Channel, as its average annual water temperature is 54°F (12°C), while the English Channel's is 55°F (13°C).

Which countries are washed by the Irish Sea?

The Irish Sea washes United Kingdom, and Ireland.

What are the most popular resorts located on the Irish Sea?

The most popular beach destinations on the Irish Sea are Dublin (Ireland), Greystones (Ireland), Dun Laoghaire (Ireland), Killiney (Ireland), Bray (Ireland), Bangor (United Kingdom), Kilmore Quay (Ireland), Portmarnock (Ireland), Wicklow (Ireland), Clogherhead (Ireland).

Do you have any extended or additional information about the Irish Sea?

The Irish Sea is a marginal sea of the Atlantic Ocean, located between the islands of Great Britain in the east and Ireland in the west. It washes from the south the coast of Scotland, from the west - the Republic of Ireland and Northern Ireland. Wales is located south of the sea, England is to the east.

Do you have a few more photos of the the Irish Sea?