Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 12 am 12 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.5°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 (12 Sep):

  • Morning surf: Morning surf (12 Sep, local time) - 4.5ft (1.4m), 12s period with NW swell.
  • Afternoon surf: Afternoon surf (12 Sep, local time) - 5ft (1.6m), 13s period with NW swell.
  • Evening surf: Evening surf (12 Sep, local time) - 4.5ft (1.4m), 12s period with NW swell.

The current surf forecast for Castlerock at 3AM is: 1.3m 13s primary swell from a Northwest direction and 0.8m 13s secondary swell from a Northwest direction (forecast issued at 12:00am September 12). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (BST) & DateWave HeightWave Period
Morning (12 Sep)4.5ft (1.4m)12s
Afternoon (12 Sep)5ft (1.6m)13s
Evening (12 Sep)4.5ft (1.4m)12s

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


Short Range Forecast

Moderate rain (total 15mm), heaviest on Fri night. Warm (max 20°C on Mon afternoon, min 11°C on Sat night). Winds decreasing (fresh winds from the SSW on Fri night, light winds from the SSW by Sat night).

Saturday
12
Sunday
13
Monday
14
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
1
2
2
0
1
2
1
1
2
2
2
1
1
1
1
1
1
0
0
0
0
0
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)
1.3
NW
13
1.3
NW
13
1.3
NW
13
1.5
NW
12
1.5
NW
13
1.6
NW
13
1.6
NW
12
1.4
NW
12
1.3
NW
12
1.3
NW
12
1.1
NW
11
1.1
NW
11
1
NW
11
0.9
NW
10
0.8
NW
10
0.8
NW
10
0.7
NW
9
0.6
NW
9
0.6
NW
9
0.5
NW
9
0.5
NW
9
0.4
NW
8
0.3
WNW
11
0.4
WNW
9
Wave Graph
Metric surfscale
Energy kJ
553
545
581
666
699
865
741
565
442
427
298
258
220
167
136
113
87
65
50
38
36
18
23
26
Wind (km/h)
25
S
30
SSW
25
SSW
25
WSW
20
WSW
20
NW
15
NW
10
W
10
W
5
W
5
SSW
10
SSW
5
S
5
SSE
15
SSE
15
S
15
S
15
S
15
SSE
15
S
20
SSW
20
SSW
20
S
25
SW
Wind State
off
off
cross-off
cross-off
cross-off
cross-on
cross-on
cross
cross
cross
cross-off
off
off
off
cross-off
off
off
off
off
off
cross-off
off
off
cross-off
High Tide
7:21AM1.71m
7:44PM2.04m
7:53AM1.72m
8:15PM1.93m
8:23AM1.69m
8:45PM1.78m
Low Tide
1:42AM0.04m
1:33PM-0.05m
2:11AM0.08m
2:06PM-0.01m
2:38AM0.15m
2:39PM0.09m
light rain
light rain
light rain
rain showers
cloud
cloud
clear
part cloud
cloud
part cloud
clear
part cloud
part cloud
part cloud
cloud
cloud
clear
cloud
cloud
cloud
cloud
part cloud
light rain
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:52
6:54
6:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:52
7:50
7:47
 mm
1
5
2
2
5
Temp °C
13
14
16
17
17
15
14
13
12
12
11
12
15
18
18
16
15
15
16
16
19
20
17
17
Feels °C
8
9
12
14
14
12
12
12
10
11
10
11
14
17
16
14
13
13
14
14
16
18
15
13
  • 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.


Nearest locationNearest