Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 12 am 21 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.2°C
1.5° 

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 (21 Sep):

  • Morning surf: Morning surf (21 Sep, local time) - 3.5ft (1.1m), 12s period with NW swell.
  • Afternoon surf: Afternoon surf (21 Sep, local time) - 3ft (0.9m), 11s period with NW swell.
  • Evening surf: Evening surf (21 Sep, local time) - 2.5ft (0.7m), 11s period with NW swell.

The current surf forecast for Castlerock at 6AM is: 1.1m 12s primary swell from a Northwest direction and 0.4m 7s secondary swell from a North-northwest direction (forecast issued at 12:00am September 21). The wind direction is predicted to be offshore and the swell rating is 2.

Time (BST) & DateWave HeightWave Period
Morning (21 Sep)3.5ft (1.1m)12s
Afternoon (21 Sep)3ft (0.9m)11s
Evening (21 Sep)2.5ft (0.7m)11s

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


Short Range Forecast

Moderate rain (total 11mm), heaviest on Tue night. Warm (max 22°C on Mon afternoon, min 10°C on Tue night). Wind will be generally light.

Monday
21
Tuesday
22
Wednesday
23
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)
3
2
2
2
2
1
1
1
1
1
1
1
0
0
0
0
2
1
0
0
0
0
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
NW
13
1.3
NW
12
1
NW
12
1.1
NW
12
0.9
NW
12
0.9
NW
11
0.8
NW
11
0.7
NW
11
0.7
NW
11
0.7
NW
10
0.7
WNW
10
0.8
WNW
10
0.7
WNW
10
0.5
WNW
10
0.8
WNW
15
1
NW
15
1.2
NW
14
1.2
NW
14
1.2
NW
14
1.3
NW
13
1.3
NW
13
1.1
NW
12
1.2
NW
12
1.1
NW
12
Wave Graph
Metric surfscale
Energy kJ
653
481
282
309
220
179
140
117
115
106
92
123
90
58
279
418
589
556
556
552
543
373
403
338
Wind (km/h)
20
SSE
20
S
15
S
15
SSW
15
SW
10
SW
10
SSW
15
S
15
S
15
S
15
S
15
S
15
NW
10
NW
15
N
15
NNW
5
N
10
NW
15
NW
20
NW
25
NW
20
NW
10
N
5
SSE
Wind State
off
off
off
cross-off
cross-off
cross-off
cross-off
off
off
off
off
off
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
on
glassy
High Tide
3:56AM1.03m
4:25PM1.30m
4:33AM1.16m
4:57PM1.46m
5:01AM1.30m
5:23PM1.62m
Low Tide
9:43AM0.65m
10:51PM0.62m
10:35AM0.50m
11:24PM0.49m
11:11AM0.36m
cloud
cloud
cloud
cloud
clear
clear
part cloud
clear
clear
clear
clear
part cloud
light rain
light rain
light rain
light rain
light rain
part cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:09
7:11
7:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:30
7:27
7:23
 mm
1
2
2
2
4
Temp °C
14
14
15
16
20
22
21
18
18
17
16
16
14
12
12
11
10
12
12
12
13
13
12
11
Feels °C
10
10
13
15
19
21
21
17
16
15
14
14
12
11
10
9
8
10
8
8
8
9
10
10
  • 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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