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Coldest sea in Ireland in December

169 coastal locations in Ireland ranked by typical December sea temperature, coldest first. Region-wide average in December: 10.5°C.

Coldest in December

Blackrock

9.4°C December mean in Ireland

Regional December average

10.5°C

across all 169 coastal locations in Ireland

Vs annual mean

-1.7°C

below the year-round regional average

What the Ireland sea feels like in December

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

Ireland monthly average 9.0°C to 16.0°C
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D
  • Warmest month August 16.0°C
  • Coldest month February 9.0°C
  • Annual mean 12.3°C
  • Months above 20°C 0 of 12

Where December fits in the year

December sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve Ireland month rankings:

Ireland sea temperature map (live)

The map shows today's latest reading at every Ireland location. The list below is based on the typical December mean.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 coldest Ireland locations in December

Sorted by typical December mean from a decade of daily readings, coldest first. Click any place for the full location page.

# Location December mean
1 Blackrock County Louth 9.4°C
2 Soldiers Point County Louth 9.4°C
3 Drogheda 9.7°C
4 Dunany Point County Louth 10.0°C
5 Greenore County Louth 10.0°C
6 Bundoran 10.1°C
7 Mullaghmore 10.1°C
8 Sligo 10.1°C
9 Donegal 10.1°C
10 Killybegs 10.1°C
11 Ballysadare Bay County Sligo 10.2°C
12 Balbriggan 10.2°C
13 Bettystown 10.2°C
14 Carlingford 10.2°C
15 Dundalk 10.2°C
16 Laytown 10.2°C
17 Rush 10.2°C
18 Skerries 10.2°C
19 Galway 10.2°C
20 Lahinch 10.2°C
21 Limerick 10.2°C
22 Salthill 10.2°C
23 Shannon 10.2°C
24 Spanish Point 10.2°C
25 Ballyshannon County Donegal 10.2°C
Show 25 more ▸
26 Roundstone 10.2°C
27 Clare Island County Mayo 10.3°C
28 Coney Island County Clare 10.3°C
29 Foynes Island County Limerick 10.3°C
30 Gaillimh County Galway 10.3°C
31 Galway City County Galway 10.3°C
32 Killary Harbour County Galway 10.3°C
33 Letterfrack County Galway 10.3°C
34 Limerick Harbour County Limerick 10.3°C
35 Liscannor County Clare 10.3°C
36 Mellon Point County Limerick 10.3°C
37 Oranmore County Galway 10.3°C
38 Roonah Quay County Mayo 10.3°C
39 Westport County Mayo 10.3°C
40 Buncrana 10.3°C
41 An Ros County Dublin 10.4°C
42 Loughros More Bay County Donegal 10.4°C
43 River Boyne Entrance County Meath 10.4°C
44 Cranford Bay County Donegal 10.4°C
45 Doolin 10.4°C
46 Fanad Head County Donegal 10.4°C
47 Rathmullan County Donegal 10.4°C
48 Enniscrone 10.4°C
49 Bulbinbeg County Donegal 10.4°C
50 Clifden 10.4°C

Warmest 10 in Ireland in December

Same data the other way. The warmest spots for the same month.

# Location December mean
1 Kilmore Quay 11.3°C
2 Rosslare Strand 11.2°C
3 Wexford 11.2°C
4 Duncannon 11.2°C
5 Dunmore East 11.2°C
6 Carnsore Point County Wexford 11.1°C
7 Ardmore 11.0°C
8 Tramore 11.0°C
9 Kish Bank County Dublin 10.9°C
10 Youghal 10.9°C

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