Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle48hr Weather and Surf, issued 6 pm Tuesday 19 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
10.8° C
(Which is normal for this time of year)

How big are the waves at Castlerock today?

The current surf forecast for Castlerock at 11PM is: 0.2m 16s primary swell from a West-northwest direction and 0.2m 9s secondary swell from a West-northwest direction (forecast issued at 06:00pm May 19). The wind direction is predicted to be cross-offshore.

Time (BST) & DateWave HeightWave Period
Morning (19 May)--
Afternoon (19 May)1ft (0.3m)9s
Evening (19 May)0.5ft (0.2m)16s

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 11mm), heaviest on Tue afternoon. Very mild (max 19°C on Thu afternoon, min 9°C on Tue night). Wind will be generally light.

Tue
19
Wednesday
20
Thursday
21
Fri
22
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
10 AM
1 PM
Rating
(10 max)
0
0
0
1
1
1
0
0
0
1
1
0
1
1
1
0
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)
0.2
WNW
9
0.2
WNW
9
0.2
WNW
16
0.4
NW
16
0.6
WNW
15
0.6
WNW
15
0.6
WNW
14
0.5
WNW
14
0.4
WNW
13
0.4
WNW
13
0.4
WNW
12
0.3
WNW
12
0.3
WNW
12
0.6
NW
9
0.6
NW
8
0.6
NW
8
0.3
WNW
11
0.3
WNW
11
0.2
WNW
11
0.2
W
11
0.2
W
11
0.2
W
11
0.2
W
12
0.2
W
11
Wave Graph
Metric surfscale
Energy kJ
8
8
25
64
186
167
160
107
68
56
50
28
28
62
43
41
22
23
11
9
9
9
10
9
Wind (km/h)
15
S
15
SSW
10
S
10
SW
15
SSW
20
S
25
WSW
25
W
20
W
10
WSW
10
S
15
SSE
20
SSE
20
S
20
S
20
SSW
15
SSW
15
SSE
20
S
20
SSE
20
SSE
20
SSE
15
S
15
S
off
cross-off
off
cross-off
off
off
cross-off
cross
cross
cross-off
off
cross-off
off
off
off
cross-off
cross-off
off
off
off
off
off
off
off
High Tide
8:49PM1.85m
9:12AM1.51m
9:42PM1.78m
10:02AM1.34m
10:43PM1.68m
11:02AM1.19m
Low Tide
2:38PM0.18m
3:28AM0.21m
3:25PM0.25m
4:31AM0.33m
4:18PM0.33m
5:43AM0.45m
rain showers
light rain
light rain
rain showers
cloud
cloud
part cloud
clear
clear
part cloud
cloud
cloud
cloud
light rain
part cloud
cloud
cloud
light rain
light rain
cloud
cloud
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:11
5:09
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:35
9:37
9:37
9:39
1
3
2
1
1
2
1
Temp °C
13
12
11
11
9
10
11
14
15
15
13
12
11
13
15
16
19
15
15
14
13
13
15
16
10
9
9
9
6
6
6
8
9
13
11
9
8
10
12
14
17
14
12
11
9
9
13
13
Swell 1
Height (m)
Direction
Period (s)
0.3
ESE
4
0.2
WNW
9
0.2
WNW
9
0.4
NW
16
0.6
WNW
15
0.6
WNW
15
0.6
WNW
14
0.5
WNW
14
0.4
WNW
13
0.5
WNW
6
0.4
WNW
6
0.4
WNW
6
0.5
NW
7
0.6
NW
9
0.6
NW
8
0.6
NW
8
0.4
NW
7
0.4
NW
7
0.3
NW
7
0.3
NW
7
0.3
NW
7
0.2
WNW
7
0.3
ESE
4
0.2
E
4
Energy kJ
3
8
8
64
186
167
160
107
68
21
16
16
23
62
43
41
19
14
8
7
7
4
3
1
Swell 2
Height (m)
Direction
Period (s)
0.2
WNW
9
0.2
ESE
3
0.2
WNW
16
0.2
WNW
9
0.4
WNW
13
0.4
WNW
12
0.3
WNW
12
0.3
WNW
12
0.3
WNW
12
0.3
WNW
11
0.2
WNW
11
0.3
WNW
11
0.3
WNW
11
0.2
WNW
11
0.2
W
11
0.2
W
11
0.2
W
11
0.2
W
12
0.1
NW
6
Energy kJ
8
1
25
8
56
50
28
28
27
24
12
22
23
11
9
9
9
10
2
Swell 3
Height (m)
Direction
Period (s)
0.1
NW
13
0.1
NW
13
0.2
ESE
3
0.2
ESE
3
0.3
WNW
7
0.1
N
8
0.2
WNW
6
0.2
W
11
Energy kJ
7
7
1
1
10
1
4
9
Wind waves
Height (m)
Direction
Period (s)
0.2
SSE
4
0.3
WSW
2
0.6
W
6
0.6
WNW
6
0.2
SSE
3
0.3
SE
2
0.4
SE
3
Energy kJ
1
1
26
30
1
1
3
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
4
1
1
1
1
1
1
1
2
1
2
1
1
2
2
1
1
Distance (km)
42
40
16
0
0
0
282
187
71
0
0
25
0
0
0
60
14
40
83
56
83
56
56
56
Best forecast wave conditions in Londonderry
Rating
(10 max)
1
1
1
1
1
1
1
1
Best forecast wave conditions in Ireland
Rating
(10 max)
2
3
4
4
3
1
4
4
4
3
3
3
2
2
2
2
2
2
2
1
2
3
2
2
Header Global
Rating
(10 max)
4
4
4
5
5
5
4
4
4
5
5
4
4
5
5
4
4
4
4
5
5
5
7
8
  • 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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