Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 6 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
16.2°C
1.8° 

Castlerock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Castlerock today (31 Aug):

  • Morning surf: Morning surf (31 Aug, local time) - 2.5ft (0.8m), 4s period with NW swell.
  • Afternoon surf: Afternoon surf (31 Aug, local time) - 3.5ft (1.1m), 6s period with NW swell.
  • Evening surf: Evening surf (31 Aug, local time) - 2.5ft (0.7m), 6s period with NW swell.

The current surf forecast for Castlerock at 12AM is: 0.2m 9s primary swell from a West direction and 0.2m 6s secondary swell from a North-northwest direction (forecast issued at 06:00pm August 30). The wind direction is predicted to be cross-onshore.

Time (BST) & DateWave HeightWave Period
Morning (31 Aug)2.5ft (0.8m)4s
Afternoon (31 Aug)3.5ft (1.1m)6s
Evening (31 Aug)2.5ft (0.7m)6s

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


Short Range Forecast

Light rain (total 9mm), mostly falling on Sun afternoon. Very mild (max 17°C on Tue morning, min 12°C on Mon night). Winds increasing (calm on Sun afternoon, fresh winds from the WNW by Mon morning).

Sun
30
Monday
31
Tuesday
1
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)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.3
NNW
6
0.2
NNW
6
0.2
NNW
6
0.2
W
9
0.2
NNW
6
0.4
NW
4
1
NW
4
1.1
NW
5
1.1
NW
6
0.8
NW
7
0.7
NW
6
0.6
NW
6
0.6
NW
6
0.4
WNW
6
0.5
WNW
7
0.7
WNW
8
0.9
WNW
9
0.9
WNW
8
0.8
WNW
8
Wave Graph
Metric surfscale
Energy kJ
8
4
3
6
4
5
36
74
91
63
39
31
23
17
29
58
119
111
86
Wind (km/h)
5
ESE
5
WNW
10
NW
15
NW
15
W
25
W
30
WNW
25
WNW
20
W
20
WSW
20
SW
20
SW
20
SSW
20
SW
25
SW
25
WSW
20
WSW
20
WSW
10
SW
Wind State
glassy
glassy
cross-on
cross-on
cross
cross
cross-on
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
8:18PM1.95m
8:27AM1.68m
8:50PM1.89m
9:01AM1.64m
9:24PM1.77m
Low Tide
2:06PM0.03m
2:42AM0.17m
2:34PM0.08m
3:10AM0.21m
3:05PM0.16m
rain showers
light rain
part cloud
clear
clear
clear
cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
part cloud
cloud
cloud
light rain
light rain
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:30
6:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:25
8:22
8:21
 mm
1
3
1
2
Temp °C
16
16
15
14
14
14
13
14
15
15
14
13
12
14
15
17
16
15
15
Feels °C
16
16
14
12
12
10
7
8
10
12
11
10
8
10
10
13
13
12
14
  • 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
How to use the Wavefinder 

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castlerock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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