Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 12 pm 21 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.2°C
1.6° 

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 (0.8m), 11s period with NW swell.

The current surf forecast for Castlerock at 6PM is: 0.9m 11s primary swell from a Northwest direction (forecast issued at 12:00pm September 21). The wind direction is predicted to be cross-offshore.

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 (0.8m)11s

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


Short Range Forecast

Light rain (total 9mm), mostly falling on Tue afternoon. Warm (max 22°C on Mon afternoon, min 10°C on Wed night). Wind will be generally light.

Mon
21
Tuesday
22
Wednesday
23
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
1
1
1
1
1
1
1
1
0
0
1
0
0
0
1
1
0
0
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
NW
12
0.9
NW
12
0.9
NW
11
0.9
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
0.6
WNW
10
0.8
WNW
15
1
NW
15
1.3
NW
14
1.3
NW
14
1.3
NW
14
1.3
NW
13
1.3
NW
13
1.2
NW
12
1.1
NW
12
1.1
NW
11
Wave Graph
Metric surfscale
Energy kJ
309
220
176
169
117
115
106
94
123
92
80
279
418
658
630
612
552
543
416
361
283
Wind (km/h)
15
SSW
15
SW
10
WSW
10
SSW
15
SSW
15
SSE
15
S
15
SSE
15
S
15
NW
10
NNW
10
NNW
15
NNW
15
NW
15
NW
15
WNW
15
WNW
20
NW
15
NNW
5
N
10
SE
Wind State
cross-off
cross-off
cross-off
cross-off
off
off
off
off
off
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
glassy
cross-off
High Tide
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
part cloud
clear
clear
part cloud
clear
clear
clear
clear
cloud
cloud
light rain
light rain
light rain
light rain
cloud
clear
clear
part cloud
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
2
3
3
1
Temp °C
16
20
22
21
19
18
17
16
16
15
12
12
12
12
12
12
12
13
13
12
11
Feels °C
15
18
21
21
17
15
16
14
14
13
10
11
10
9
9
9
9
8
10
11
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
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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