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Coldest sea in Ireland in May

169 coastal locations in Ireland ranked by typical May sea temperature, coldest first. Region-wide average in May: 12.2°C.

Coldest in May

Moville

10.5°C May mean in Ireland

Regional May average

12.2°C

across all 169 coastal locations in Ireland

Vs annual mean

-0.1°C

below the year-round regional average

What the Ireland sea feels like in May

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 May fits in the year

May 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 May 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 May

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

# Location May mean
1 Moville 10.5°C
2 Inishtrahull County Donegal 10.6°C
3 Buncrana 10.9°C
4 Bulbinbeg County Donegal 11.1°C
5 Malin Head County Donegal 11.1°C
6 Trawbreaga Bay County Donegal 11.1°C
7 Arklow 11.2°C
8 Wicklow 11.2°C
9 Cranford Bay County Donegal 11.5°C
10 Fanad Head County Donegal 11.5°C
11 Rathmullan County Donegal 11.5°C
12 Bray 11.5°C
13 Dublin 11.5°C
14 Greystones 11.5°C
15 Rosslare Strand 11.6°C
16 Wexford 11.6°C
17 Kish Bank County Dublin 11.6°C
18 Courtown County Wexford 11.6°C
19 Blackrock 11.6°C
20 Clogherhead 11.6°C
21 Dalkey 11.6°C
22 Donabate 11.6°C
23 Dun Laoghaire 11.6°C
24 Forty Foot 11.6°C
25 Howth 11.6°C
Show 25 more ▸
26 Killiney 11.6°C
27 Malahide 11.6°C
28 Monkstown 11.6°C
29 Portmarnock 11.6°C
30 Portraine 11.6°C
31 Sandycove 11.6°C
32 Seapoint 11.6°C
33 Dunfanaghy County Donegal 11.7°C
34 Mulroy Bay (Bar) County Donegal 11.7°C
35 Sheep Haven County Donegal 11.7°C
36 Loch Garman County Wexford 11.7°C
37 Rosslare Europort County Wexford 11.7°C
38 Wexford Harbour County Wexford 11.7°C
39 Balbriggan 11.8°C
40 Bettystown 11.8°C
41 Carlingford 11.8°C
42 Dundalk 11.8°C
43 Laytown 11.8°C
44 Rush 11.8°C
45 Skerries 11.8°C
46 Carnsore Point County Wexford 11.8°C
47 Gweedore County Donegal 11.8°C
48 Inishbofin County Donegal 11.8°C
49 Tory Island County Donegal 11.8°C
50 Belmullet 11.9°C

Warmest 10 in Ireland in May

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

# Location May mean
1 Crookhaven County Cork 12.8°C
2 Dunmanus County Cork 12.8°C
3 Baltimore County Cork 12.8°C
4 Castletownshend County Cork 12.8°C
5 Carrigaholt County Clare 12.8°C
6 Tarbert Island County Kerry 12.8°C
7 Coney Island County Clare 12.8°C
8 Foynes Island County Limerick 12.8°C
9 Gaillimh County Galway 12.8°C
10 Galway City County Galway 12.8°C

More on this region