Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle48hr Weather and Surf, issued 12 am Sunday 17 May 2026 BST
Forecast update in hr  min  s Forecast update imminent
Castlerock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castlerock sea temperature is
10.7° C
(Which is normal for this time of year)

How big are the waves at Castlerock today?

The current surf forecast for Castlerock at 5AM is: 1.1m 14s primary swell from a West-northwest direction (forecast issued at 12:00am May 17). The wind direction is predicted to be cross-offshore.

Time (BST) & DateWave HeightWave Period
Morning (17 May)4.5ft (1.3m)13s
Afternoon (17 May)4.5ft (1.3m)13s
Evening (17 May)3.5ft (1.1m)13s

Table - waves today at Castlerock. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 13mm), heaviest on Sun afternoon. Very mild (max 13°C on Tue afternoon, min 7°C on Sat night). Winds increasing (calm on Mon morning, fresh winds from the SE by Mon night).

Sunday
17
Monday
18
Tuesday
19
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
Rating
(10 max)
1
1
2
2
2
2
2
2
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.8
WNW
11
1.1
WNW
14
1.3
WNW
13
1.3
WNW
13
1.3
WNW
13
1.2
NW
13
1.2
WNW
13
1.1
NW
12
1.1
NW
12
0.9
WNW
12
0.9
WNW
12
0.9
NW
11
0.9
NW
11
0.8
WNW
11
0.7
NW
10
0.7
NW
10
0.6
NW
10
0.6
WNW
10
0.5
NW
10
0.4
WNW
10
0.4
NW
9
0.4
NW
9
0.2
WNW
9
0.2
WNW
13
Wave Graph
Metric surfscale
Energy kJ
138
460
536
634
581
494
437
353
325
243
231
176
172
149
112
104
80
65
47
36
22
21
8
17
Wind (km/h)
20
WSW
20
SW
20
SW
20
WSW
20
SW
10
SSW
10
WSW
5
WNW
10
NW
10
WNW
5
WNW
0
N
10
ENE
10
E
15
SE
20
SE
25
SE
35
SE
35
SE
20
SSE
15
S
20
WSW
15
SW
15
SSE
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
glassy
cross-on
cross-on
cross
glassy
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-off
off
High Tide
6:55AM1.88m
7:17PM1.85m
7:39AM1.80m
8:01PM1.88m
8:25AM1.67m
8:49PM1.85m
Low Tide
00:49AM0.08m
1:15PM0.08m
1:38AM0.07m
1:55PM0.12m
2:31AM0.11m
2:38PM0.18m
clear
part cloud
clear
part cloud
rain showers
cloud
light rain
part cloud
cloud
cloud
part cloud
clear
part cloud
cloud
cloud
cloud
cloud
light rain
light rain
cloud
cloud
light rain
light rain
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:13
5:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:31
9:32
9:35
1
5
1
3
2
1
3
Temp °C
7
7
7
10
10
10
8
7
8
8
8
9
10
11
12
9
9
9
9
10
12
13
13
11
2
2
2
5
5
7
5
5
5
5
6
8
7
8
8
4
3
2
2
6
10
10
10
8
Swell 1
Height (m)
Direction
Period (s)
0.8
WNW
11
1.1
WNW
14
1.3
WNW
13
1.3
WNW
13
1.3
WNW
13
1.2
NW
13
1.2
WNW
13
1.1
NW
12
1.1
NW
12
0.9
WNW
12
0.9
WNW
12
0.9
NW
11
0.9
NW
11
0.8
WNW
11
0.7
NW
10
0.7
NW
10
0.6
NW
10
0.6
WNW
10
0.5
NW
10
0.4
WNW
10
0.6
ESE
5
0.4
E
5
0.2
WNW
9
0.2
WNW
9
Energy kJ
138
460
536
634
581
494
437
353
325
243
231
176
172
149
112
104
80
65
47
36
20
7
8
8
Swell 2
Height (m)
Direction
Period (s)
0.5
NW
14
0.1
W
15
0.1
W
15
0.4
NW
9
0.4
NW
9
0.3
E
4
0.2
WNW
13
Energy kJ
102
4
4
22
21
3
17
Swell 3
Height (m)
Direction
Period (s)
0.4
WNW
11
0.1
W
14
0.1
NW
13
0.1
NW
13
0.2
E
3
Energy kJ
46
4
7
7
1
Wind waves
Height (m)
Direction
Period (s)
0.3
ESE
2
0.4
SE
3
0.7
ESE
4
1
ESE
5
0.9
ESE
5
0.3
SW
2
Energy kJ
1
2
11
47
48
1
Nearest Offshore or Glassy
Rating
(10 max)
2
2
3
3
3
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
2
Distance (km)
9
9
9
9
9
0
0
0
9
9
8
0
2
2
2
2
16
121
162
16
27
42
42
40
Best forecast wave conditions in Londonderry
Rating
(10 max)
2
2
2
1
1
1
1
1
Best forecast wave conditions in Ireland
Rating
(10 max)
2
2
3
3
3
2
2
2
3
4
3
3
3
2
2
2
1
1
1
1
1
1
3
2
Header Global
Rating
(10 max)
5
4
4
6
9
9
7
4
4
5
7
5
4
5
4
4
4
4
5
5
4
4
5
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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