Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle48hr Weather and Surf, issued 12 am Monday 25 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
11.5° C
(Which is slightly warmer than usual)

How big are the waves at Castlerock today?

The current surf forecast for Castlerock at 5AM is: 0.8m 14s primary swell from a West-northwest direction (forecast issued at 12:00am May 25). The wind direction is predicted to be cross-offshore and the swell rating is 2.

Time (BST) & DateWave HeightWave Period
Morning (25 May)2.5ft (0.8m)13s
Afternoon (25 May)2.5ft (0.8m)13s
Evening (25 May)2.5ft (0.8m)12s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Very mild (max 18°C on Wed morning, min 10°C on Tue night). Wind will be generally light.

Monday
25
Tuesday
26
Wednesday
27
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)
2
2
2
2
1
0
0
0
0
0
1
0
0
0
0
0
0
1
1
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)
0.7
NW
14
0.8
WNW
14
0.8
WNW
13
0.8
WNW
13
0.8
WNW
13
0.8
WNW
13
0.8
WNW
12
0.8
WNW
12
0.8
WNW
12
0.8
WNW
12
0.9
NW
12
0.8
WNW
12
0.8
WNW
11
0.7
NW
11
0.7
WNW
11
0.6
WNW
10
0.6
WNW
11
0.5
NW
11
0.5
NW
10
0.3
WNW
10
0.3
WNW
10
0.4
NW
7
0.4
NW
7
0.4
NW
7
Wave Graph
Metric surfscale
Energy kJ
211
250
225
222
219
209
190
184
187
190
209
174
157
119
101
71
75
55
54
20
20
13
12
12
Wind (km/h)
10
S
10
SSW
10
SSW
5
SW
10
N
10
N
15
N
10
N
5
NNE
5
N
10
N
10
N
15
N
15
N
15
N
10
NNW
10
NNW
5
NNW
5
SE
15
ESE
20
ESE
20
ESE
20
ESE
20
ESE
off
cross-off
off
cross-off
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
2:39AM1.54m
3:12PM1.16m
3:37AM1.56m
4:06PM1.27m
4:23AM1.56m
4:49PM1.38m
Low Tide
9:24AM0.50m
8:58PM0.48m
10:15AM0.44m
10:01PM0.45m
10:55AM0.39m
clear
part cloud
part cloud
cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:01
5:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:45
9:45
9:47
Temp °C
17
16
15
16
16
16
13
13
12
12
12
12
14
14
13
11
10
10
12
14
18
18
17
16
16
13
13
15
14
14
11
12
11
10
10
9
10
9
9
8
7
8
10
12
16
15
14
14
Swell 1
Height (m)
Direction
Period (s)
0.7
NW
14
0.8
WNW
14
0.8
WNW
13
0.8
WNW
13
0.8
WNW
13
0.8
WNW
13
0.8
WNW
12
0.8
WNW
12
0.8
WNW
12
0.8
WNW
12
0.9
NW
12
0.8
WNW
12
0.8
WNW
11
0.7
NW
11
0.7
WNW
11
0.6
WNW
10
0.6
WNW
11
0.5
NW
11
0.5
NW
10
0.4
NNW
7
0.4
NNW
7
0.4
NW
7
0.4
NW
7
0.4
NW
7
Energy kJ
211
250
225
222
219
209
190
184
187
190
209
174
157
119
101
71
75
55
54
18
18
13
12
12
Swell 2
Height (m)
Direction
Period (s)
0.1
SE
4
0.4
N
4
0.5
N
4
0.3
NNE
4
0.3
WNW
10
0.3
WNW
10
0.2
WNW
10
0.2
WNW
10
0.2
WNW
10
Energy kJ
1
5
9
4
20
20
10
10
9
Swell 3
Height (m)
Direction
Period (s)
0.3
NNW
4
Energy kJ
4
Wind waves
Height (m)
Direction
Period (s)
0.3
N
3
0.3
N
3
0.3
E
3
0.4
E
3
0.5
E
3
0.4
ESE
3
Energy kJ
2
2
1
3
5
4
Nearest Offshore or Glassy
Rating
(10 max)
2
2
2
2
3
1
1
3
2
3
3
3
3
1
1
2
2
1
1
1
1
1
1
1
Distance (km)
0
0
0
0
42
71
71
40
25
40
40
40
40
71
71
41
40
0
0
14
40
40
40
40
Best forecast wave conditions in Londonderry
Rating
(10 max)
2
2
2
2
1
1
Best forecast wave conditions in Ireland
Rating
(10 max)
4
4
4
4
4
3
3
3
3
3
3
3
3
2
2
2
2
2
1
2
1
1
1
1
Header Global
Rating
(10 max)
5
4
4
4
4
4
4
4
4
5
8
9
9
9
9
5
6
6
7
7
7
6
7
7
  • 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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