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Coldest sea in Ireland in October

169 coastal locations in Ireland ranked by typical October sea temperature, coldest first. Region-wide average in October: 13.8°C.

Coldest in October

Drogheda

13.3°C October mean in Ireland

Regional October average

13.8°C

across all 169 coastal locations in Ireland

Vs annual mean

+1.5°C

above the year-round regional average

What the Ireland sea feels like in October

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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  • 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 October fits in the year

October 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 October 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 October

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

# Location October mean
1 Drogheda 13.3°C
2 Blackrock County Louth 13.3°C
3 Soldiers Point County Louth 13.3°C
4 Gweedore County Donegal 13.4°C
5 Inishbofin County Donegal 13.4°C
6 Tory Island County Donegal 13.4°C
7 Buncrana 13.4°C
8 Belmullet 13.4°C
9 Balbriggan 13.4°C
10 Bettystown 13.4°C
11 Bundoran 13.4°C
12 Carlingford 13.4°C
13 Dundalk 13.4°C
14 Laytown 13.4°C
15 Mullaghmore 13.4°C
16 Rush 13.4°C
17 Skerries 13.4°C
18 Sligo 13.4°C
19 Donegal 13.4°C
20 Dunfanaghy County Donegal 13.4°C
21 Killybegs 13.4°C
22 Mulroy Bay (Bar) County Donegal 13.4°C
23 Sheep Haven County Donegal 13.4°C
24 Achill Island 13.4°C
25 Enniscrone 13.5°C
Show 25 more ▸
26 Cranford Bay County Donegal 13.5°C
27 Fanad Head County Donegal 13.5°C
28 Moville 13.5°C
29 Rathmullan County Donegal 13.5°C
30 Burtonport County Donegal 13.5°C
31 Dunany Point County Louth 13.5°C
32 Greenore County Louth 13.5°C
33 Blackrock 13.6°C
34 Bulbinbeg County Donegal 13.6°C
35 Clogherhead 13.6°C
36 Dalkey 13.6°C
37 Donabate 13.6°C
38 Dun Laoghaire 13.6°C
39 Forty Foot 13.6°C
40 Howth 13.6°C
41 Killiney 13.6°C
42 Malahide 13.6°C
43 Malin Head County Donegal 13.6°C
44 Monkstown 13.6°C
45 Portmarnock 13.6°C
46 Portraine 13.6°C
47 Sandycove 13.6°C
48 Seapoint 13.6°C
49 Trawbreaga Bay County Donegal 13.6°C
50 Ballyglass (Broadhaven) County Mayo 13.6°C

Warmest 10 in Ireland in October

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

# Location October mean
1 Courtown County Wexford 14.6°C
2 Arklow 14.5°C
3 Wicklow 14.5°C
4 Loch Garman County Wexford 14.5°C
5 Rosslare Europort County Wexford 14.5°C
6 Wexford Harbour County Wexford 14.5°C
7 Carnsore Point County Wexford 14.4°C
8 Rosslare Strand 14.4°C
9 Wexford 14.4°C
10 Kilmore Quay 14.4°C

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