Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock 48 hour detailed Surf Forecast

Issued: 12 am 20 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.3°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 (20 Sep):

  • Morning surf: Morning surf (20 Sep, local time) - 8ft (2.4m), 12s period with NW swell.
  • Afternoon surf: Afternoon surf (20 Sep, local time) - 6ft (1.8m), 11s period with NW swell.
  • Evening surf: Evening surf (20 Sep, local time) - 5ft (1.6m), 11s period with NW swell.

The current surf forecast for Castlerock at 8AM is: 2.2m 12s primary swell from a Northwest direction (forecast issued at 12:00am September 20). The wind direction is predicted to be cross-shore.

Time (BST) & DateWave HeightWave Period
Morning (20 Sep)8ft (2.4m)12s
Afternoon (20 Sep)6ft (1.8m)11s
Evening (20 Sep)5ft (1.6m)11s

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


Short Range Forecast

Light rain (total 6mm), mostly falling on Sun night. Warm (max 22°C on Mon afternoon, min 12°C on Sat night). Winds decreasing (fresh winds from the W on Sat night, light winds from the NW by Tue afternoon).

Sunday
20
Monday
21
Tuesday
22
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
1
1
1
1
2
3
3
2
2
1
1
1
1
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)
2.4
NW
12
2.4
NW
12
2.2
NW
12
2.4
NW
12
1.9
NW
11
1.8
NW
11
1.6
NW
11
1.5
NW
12
1.4
NW
13
1.3
NW
12
1.1
NW
12
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
0.6
WNW
10
0.8
WNW
11
0.7
WNW
10
0.3
NW
18
0.7
NW
15
0.9
NW
14
Wave Graph
Metric surfscale
Energy kJ
1547
1521
1280
1470
882
729
617
593
653
481
361
268
220
176
140
115
115
108
65
135
92
58
223
297
Wind (km/h)
35
W
35
W
30
W
30
W
25
W
20
W
10
W
10
SSE
20
SSE
20
S
15
S
15
SSW
20
SW
15
SW
15
SSW
15
S
15
S
15
S
15
S
15
SSW
15
NNW
10
NNW
5
NW
10
N
Wind State
cross
cross
cross
cross
cross
cross
cross
cross-off
off
off
off
cross-off
cross-off
cross-off
cross-off
off
off
off
off
off
cross-on
on
cross-on
on
High Tide
00:31AM0.95m
3:29PM1.15m
3:56AM1.03m
4:25PM1.30m
4:33AM1.16m
4:57PM1.46m
Low Tide
7:54AM0.76m
9:57PM0.75m
9:43AM0.65m
10:51PM0.62m
10:35AM0.50m
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
cloud
light rain
cloud
clear
clear
clear
clear
clear
clear
clear
clear
cloud
light rain
light rain
light rain
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:07
7:09
7:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:31
7:30
7:27
 mm
2
1
2
1
1
Temp °C
12
12
12
13
14
14
13
13
12
12
14
17
20
22
21
19
18
17
15
15
13
12
12
12
Feels °C
4
4
5
7
9
10
11
10
8
8
12
16
18
21
20
18
17
15
13
13
11
10
11
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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