Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 12 am 17 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.6°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 (17 Sep):

  • Morning surf: Morning surf (17 Sep, local time) - 6ft (1.9m), 11s period with NW swell.
  • Afternoon surf: Afternoon surf (17 Sep, local time) - 10ft (3.0m), 13s period with NW swell.
  • Evening surf: Evening surf (17 Sep, local time) - 11ft (3.5m), 15s period with NW swell.

The current surf forecast for Castlerock at 4AM is: 1.4m 9s primary swell from a West-northwest direction and 0.1m 8s secondary swell from a North direction (forecast issued at 12:00am September 17). The wind direction is predicted to be cross-offshore.

Time (BST) & DateWave HeightWave Period
Morning (17 Sep)6ft (1.9m)11s
Afternoon (17 Sep)10ft (3.0m)13s
Evening (17 Sep)11ft (3.5m)15s

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


Short Range Forecast

Light rain (total 9mm), mostly falling on Fri morning. Very mild (max 16°C on Fri afternoon, min 12°C on Wed night). Mainly strong winds.

Thursday
17
Friday
18
Saturday
19
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
1
0
0
0
2
0
3
3
2
3
3
2
1
1
1
1
1
0
0
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)
1.2
WNW
9
1.4
WNW
9
1.6
NW
10
2.1
NW
11
2.5
NW
13
3.5
NW
13
3.5
NW
15
3.5
NW
15
3
NW
14
3
NW
14
3
NW
13
2.4
NW
13
2.2
NW
13
1.9
NW
12
2
NW
12
1.8
NW
11
1.6
NW
11
1.6
NW
11
1.6
NW
11
1.6
NW
11
2.1
WNW
11
2.2
NW
11
2.4
NW
12
2.4
NW
12
Wave Graph
Metric surfscale
Energy kJ
237
327
480
1027
2204
3732
5512
4823
4078
3301
2693
1952
1569
1048
1076
766
638
615
538
593
1018
1193
1547
1655
Wind (km/h)
30
W
30
WSW
35
WSW
35
WSW
40
W
40
W
40
W
35
W
35
W
30
WSW
25
SW
25
SSW
30
S
25
SSW
25
WSW
25
WSW
30
SW
30
WSW
30
WSW
35
WSW
40
W
35
W
35
W
30
W
Wind State
cross
cross-off
cross-off
cross-off
cross
cross
cross
cross
cross
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross
cross
High Tide
9:56AM1.41m
10:10PM1.24m
10:35AM1.27m
10:47PM1.08m
11:48AM1.13m
Low Tide
3:55AM0.49m
4:27PM0.56m
4:27AM0.61m
5:28PM0.72m
5:29AM0.73m
7:38PM0.82m
rain showers
clear
clear
light rain
rain showers
part cloud
clear
clear
part cloud
part cloud
cloud
cloud
light rain
light rain
light rain
rain showers
clear
part cloud
clear
clear
clear
cloud
cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:03
7:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:39
7:37
7:35
 mm
1
1
1
2
1
1
1
Temp °C
13
12
12
12
13
14
13
12
13
13
13
12
12
14
16
16
15
14
13
13
14
14
13
12
Feels °C
7
6
5
4
5
6
5
5
6
7
8
7
7
10
12
12
10
9
7
6
6
7
6
5
  • 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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