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Coldest sea in Ireland in April

169 coastal locations in Ireland ranked by typical April sea temperature, coldest first. Region-wide average in April: 10.1°C.

Coldest in April

Moville

9.0°C April mean in Ireland

Regional April average

10.1°C

across all 169 coastal locations in Ireland

Vs annual mean

-2.2°C

below the year-round regional average

What the Ireland sea feels like in April

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 April fits in the year

April 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 April 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 April

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

# Location April mean
1 Moville 9.0°C
2 Inishtrahull County Donegal 9.2°C
3 Buncrana 9.3°C
4 Bray 9.3°C
5 Dublin 9.3°C
6 Greystones 9.3°C
7 Blackrock 9.4°C
8 Clogherhead 9.4°C
9 Dalkey 9.4°C
10 Donabate 9.4°C
11 Dun Laoghaire 9.4°C
12 Forty Foot 9.4°C
13 Howth 9.4°C
14 Killiney 9.4°C
15 Malahide 9.4°C
16 Monkstown 9.4°C
17 Portmarnock 9.4°C
18 Portraine 9.4°C
19 Sandycove 9.4°C
20 Seapoint 9.4°C
21 Balbriggan 9.4°C
22 Bettystown 9.4°C
23 Carlingford 9.4°C
24 Dundalk 9.4°C
25 Laytown 9.4°C
Show 25 more ▸
26 Rush 9.4°C
27 Skerries 9.4°C
28 Bulbinbeg County Donegal 9.4°C
29 Malin Head County Donegal 9.4°C
30 Trawbreaga Bay County Donegal 9.4°C
31 Drogheda 9.5°C
32 Kish Bank County Dublin 9.5°C
33 Arklow 9.6°C
34 Wicklow 9.6°C
35 Howth Harbour County Dublin 9.6°C
36 North Wall (Dublin) County Dublin 9.6°C
37 An Ros County Dublin 9.6°C
38 River Boyne Entrance County Meath 9.6°C
39 Cranford Bay County Donegal 9.6°C
40 Dunany Point County Louth 9.6°C
41 Fanad Head County Donegal 9.6°C
42 Greenore County Louth 9.6°C
43 Rathmullan County Donegal 9.6°C
44 Donegal 9.7°C
45 Killybegs 9.7°C
46 Blackrock County Louth 9.7°C
47 Soldiers Point County Louth 9.7°C
48 Dunfanaghy County Donegal 9.8°C
49 Mulroy Bay (Bar) County Donegal 9.8°C
50 Sheep Haven County Donegal 9.8°C

Warmest 10 in Ireland in April

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

# Location April mean
1 Baltimore County Cork 10.7°C
2 Castletownshend County Cork 10.7°C
3 Crookhaven County Cork 10.7°C
4 Dunmanus County Cork 10.7°C
5 Knights Town County Kerry 10.6°C
6 Knightstown Contae Chiarraí 10.6°C
7 Portmagee County Kerry 10.6°C
8 Ballinskelligs Bay County Kerry 10.6°C
9 Ballyheige County Kerry 10.6°C
10 Cahersiveen County Kerry 10.6°C

More on this region