Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 12 am 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.6°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 (11 Sep):

  • Morning surf: Morning surf (11 Sep, local time) - 2.5ft (0.8m), 7s period with NW swell.
  • Afternoon surf: Afternoon surf (11 Sep, local time) - 3ft (0.9m), 8s period with NW swell.
  • Evening surf: Evening surf (11 Sep, local time) - 2.5ft (0.7m), 12s period with NW swell.

The current surf forecast for Castlerock at 3AM is: 0.8m 6s primary swell from a West-northwest direction and 0.3m 11s secondary swell from a West-northwest direction, 0.3m 12s secondary swell from a West-northwest direction (forecast issued at 12:00am September 11). The wind direction is predicted to be cross-shore.

Time (BST) & DateWave HeightWave Period
Morning (11 Sep)2.5ft (0.8m)7s
Afternoon (11 Sep)3ft (0.9m)8s
Evening (11 Sep)2.5ft (0.7m)12s

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


Short Range Forecast

Light rain (total 9mm), mostly falling on Fri night. Very mild (max 19°C on Sat morning, min 12°C on Thu night). Winds decreasing (fresh winds from the S on Fri night, calm by Sat night).

Friday
11
Saturday
12
Sunday
13
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)
0
0
0
0
0
1
2
2
2
2
3
2
1
1
1
2
1
1
2
2
2
1
1
1
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)
0.3
WNW
12
0.8
WNW
6
0.9
NW
6
0.8
NW
7
0.9
NW
8
0.9
NW
8
0.9
NW
9
0.8
NW
12
1.3
NW
13
1.3
NW
13
1.3
NW
13
1.5
NW
13
1.6
NW
13
1.6
NW
13
1.5
NW
12
1.4
NW
12
1.3
NW
12
1.2
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
Wave Graph
Metric surfscale
Energy kJ
27
44
52
55
115
118
132
193
618
609
581
688
777
851
656
565
442
383
298
258
216
167
136
115
Wind (km/h)
25
W
25
W
20
W
15
W
15
W
10
WSW
15
S
20
SSE
30
S
30
SSW
20
SSW
20
SW
20
W
15
NW
10
NNW
5
NNW
10
WNW
5
NW
0
WNW
5
S
5
SE
5
ESE
15
S
15
SSE
Wind State
cross
cross
cross
cross
cross
cross-off
off
off
off
off
off
cross-off
cross
cross-on
on
cross-on
cross
cross-on
glassy
glassy
glassy
glassy
off
off
High Tide
6:48AM1.67m
7:11PM2.08m
7:21AM1.71m
7:44PM2.04m
7:53AM1.72m
8:15PM1.93m
Low Tide
1:11AM0.05m
12:59PM-0.04m
1:42AM0.04m
1:33PM-0.05m
2:11AM0.08m
2:06PM-0.01m
part cloud
clear
part cloud
part cloud
part cloud
cloud
clear
cloud
light rain
light rain
light rain
light rain
part cloud
part cloud
cloud
cloud
cloud
clear
clear
clear
part cloud
part cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:50
6:52
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:54
7:52
7:50
 mm
3
4
1
1
Temp °C
14
13
12
14
15
16
16
13
12
14
15
18
19
16
14
14
14
13
12
13
16
17
18
17
Feels °C
10
9
8
11
11
13
13
9
6
9
12
16
17
14
13
13
13
12
12
12
16
17
17
16
  • 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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