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Coldest sea in Ireland in January

169 coastal locations in Ireland ranked by typical January sea temperature, coldest first. Region-wide average in January: 9.4°C.

Coldest in January

Blackrock

7.9°C January mean in Ireland

Regional January average

9.4°C

across all 169 coastal locations in Ireland

Vs annual mean

-2.9°C

below the year-round regional average

What the Ireland sea feels like in January

This water is very cold and can cause pain. We don't recommend you swim in this temperature for anything other than very short swims of 5 to 10 minutes unless you are a very experienced cold water swimmer.

Ireland monthly average 9.0°C to 16.0°C
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  • 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 January fits in the year

January 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 January 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 January

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

# Location January mean
1 Blackrock County Louth 7.9°C
2 Soldiers Point County Louth 7.9°C
3 Drogheda 8.3°C
4 Dunany Point County Louth 8.5°C
5 Greenore County Louth 8.5°C
6 Balbriggan 8.8°C
7 Bettystown 8.8°C
8 Carlingford 8.8°C
9 Dundalk 8.8°C
10 Laytown 8.8°C
11 Rush 8.8°C
12 Skerries 8.8°C
13 Ballysadare Bay County Sligo 8.8°C
14 Bundoran 8.8°C
15 Mullaghmore 8.8°C
16 Sligo 8.8°C
17 An Ros County Dublin 8.9°C
18 Ballyshannon County Donegal 8.9°C
19 River Boyne Entrance County Meath 8.9°C
20 Donegal 8.9°C
21 Killybegs 8.9°C
22 Coney Island County Clare 8.9°C
23 Foynes Island County Limerick 8.9°C
24 Gaillimh County Galway 8.9°C
25 Galway City County Galway 8.9°C
Show 25 more ▸
26 Limerick Harbour County Limerick 8.9°C
27 Liscannor County Clare 8.9°C
28 Mellon Point County Limerick 8.9°C
29 Oranmore County Galway 8.9°C
30 Howth Harbour County Dublin 9.0°C
31 North Wall (Dublin) County Dublin 9.0°C
32 Courtown County Wexford 9.0°C
33 Galway 9.0°C
34 Lahinch 9.0°C
35 Limerick 9.0°C
36 Salthill 9.0°C
37 Shannon 9.0°C
38 Spanish Point 9.0°C
39 Blackrock 9.1°C
40 Clogherhead 9.1°C
41 Dalkey 9.1°C
42 Donabate 9.1°C
43 Dun Laoghaire 9.1°C
44 Forty Foot 9.1°C
45 Howth 9.1°C
46 Killiney 9.1°C
47 Malahide 9.1°C
48 Monkstown 9.1°C
49 Portmarnock 9.1°C
50 Portraine 9.1°C

Warmest 10 in Ireland in January

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

# Location January mean
1 Schull 10.1°C
2 Bantry 10.1°C
3 Baltimore County Cork 10.1°C
4 Castletownshend County Cork 10.1°C
5 Crookhaven County Cork 10.1°C
6 Dunmanus County Cork 10.1°C
7 Garretstown Beach 10.1°C
8 Kilbrittain 10.1°C
9 Kinsale 10.1°C
10 Ardmore 10.1°C

More on this region