Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle48hr Weather and Surf, issued 12 pm 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
11.3° C
(Which is normal for this time of year)

How big are the waves at Castlerock today?

The current surf forecast for Castlerock at 7PM is: 0.8m 12s primary swell from a West-northwest direction (forecast issued at 12:00pm May 25). The wind direction is predicted to be onshore.

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

Light rain (total 2mm), mostly falling on Wed night. Very mild (max 18°C on Wed afternoon, min 10°C on Tue night). Wind will be generally light.

Mon
25
Tuesday
26
Wednesday
27
Thu
28
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
1 AM
4 AM
7 AM
Rating
(10 max)
2
1
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
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
0.9
NW
12
0.8
WNW
11
0.7
WNW
11
0.7
WNW
11
0.6
WNW
10
0.6
WNW
9
0.6
WNW
11
0.5
NW
11
0.3
WNW
10
0.3
WNW
10
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.3
NW
7
0.2
WNW
9
Wave Graph
Metric surfscale
Energy kJ
222
219
209
190
184
187
190
209
199
157
103
99
71
59
75
55
20
20
12
12
12
11
9
8
Wind (km/h)
5
WSW
10
N
10
N
15
N
10
N
5
N
10
N
10
N
10
N
15
N
15
N
15
N
15
NNW
10
NNW
5
NNW
0
ESE
10
E
20
ESE
20
ESE
20
ESE
20
ESE
25
ESE
25
SE
20
SE
glassy
on
on
on
on
on
on
on
on
on
on
on
on
on
on
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
3:12PM1.16m
3:37AM1.56m
4:06PM1.27m
4:23AM1.56m
4:49PM1.38m
5:02AM1.56m
Low Tide
9:24AM0.50m
8:58PM0.48m
10:15AM0.44m
10:01PM0.45m
10:55AM0.39m
10:53PM0.41m
part cloud
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
part cloud
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:01
5:01
4:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:45
9:45
9:47
9:49
1
1
Temp °C
16
16
17
13
12
12
12
12
12
13
13
12
11
10
10
11
14
17
18
17
16
15
12
11
15
14
15
11
11
11
10
10
8
9
8
8
8
7
8
10
12
15
15
14
13
11
7
7
Swell 1
Height (m)
Direction
Period (s)
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
0.9
NW
12
0.8
WNW
11
0.7
WNW
11
0.7
WNW
11
0.6
WNW
10
0.6
WNW
9
0.6
WNW
11
0.5
NW
11
0.4
NW
7
0.4
NNW
7
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.3
NW
7
0.3
NW
6
Energy kJ
222
219
209
190
184
187
190
209
199
157
103
99
71
59
75
55
16
20
12
12
12
11
7
6
Swell 2
Height (m)
Direction
Period (s)
0.4
N
4
0.5
N
4
0.5
N
4
0.4
N
4
0.3
N
4
0.3
WNW
10
0.2
WNW
10
0.2
WNW
10
0.2
WNW
10
0.2
WNW
10
0.2
WNW
10
0.2
WNW
9
Energy kJ
4
8
9
6
3
20
10
10
9
9
9
8
Swell 3
Height (m)
Direction
Period (s)
0.3
WNW
10
Energy kJ
20
Wind waves
Height (m)
Direction
Period (s)
0.2
N
3
0.3
N
3
0.3
E
2
0.4
ESE
3
0.5
E
3
0.3
ESE
3
0.4
ESE
3
0.7
ESE
4
0.7
ESE
4
Energy kJ
1
2
1
3
5
2
3
11
15
Nearest Offshore or Glassy
Rating
(10 max)
2
3
1
1
1
3
3
4
3
1
1
2
1
2
1
1
1
1
1
1
1
1
1
1
Distance (km)
0
42
71
71
71
27
40
40
40
71
71
41
114
40
8
0
14
40
40
40
40
40
40
40
Best forecast wave conditions in Londonderry
Rating
(10 max)
2
1
Best forecast wave conditions in Ireland
Rating
(10 max)
4
4
3
3
3
3
3
4
3
2
2
2
1
2
1
1
1
1
1
1
1
1
1
1
Header Global
Rating
(10 max)
5
4
4
4
4
4
5
5
9
9
9
5
6
7
7
7
8
9
9
7
6
9
7
9
  • 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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