Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 12 pm 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
16.2° C
2.2° 

Castlerock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Castlerock surf forecast from 20 Jul 2026:

  • Best quality surf: Monday 27 Jul, 1AM (local time) - 4ft (1.2m), 10s period, NW swell with cross-offshore winds.
  • Most powerful swell: Saturday 25 Jul, 7AM (local time) - 5ft (1.6m), 11s period, NW swell with 584 kJ wave energy.
  • Next surfable swell (1★+): Monday 27 Jul, 1AM (local time) - 4ft (1.2m), 10s period with NW swell.

Best Forecast Surf Conditions for Castlerock this week:

The surf forecast for Castlerock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jul 27) at 1AM. The primary swell is predicted to be 1.2m and 10s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 16 days are 1.6m 11s and forecast to arrive on Saturday (Jul 25) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Saturday (Jul 25) at 1AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Mon 27th Jul)4ft (1.2m) 10s
Best Surf 1AM (Mon 27th Jul)4ft (1.2m) 10s
Most Powerful 7AM (Sat 25th Jul)5ft (1.6m) 11s

Table - best surf conditions forecast for Castlerock over the next 16 days.


Short Range Forecast

Mostly dry. Very mild (max 15°C on Wed afternoon, min 11°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Fri night. Very mild (max 19°C on Fri morning, min 12°C on Thu night). Wind will be generally light.

Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
NNW
5
0.9
NNW
6
0.9
NNW
7
1.1
NNW
6
1.1
NNW
6
1
NNW
6
0.9
NNW
7
0.8
NNW
7
0.6
NNW
7
0.4
NNW
6
0.5
NW
6
0.7
NW
6
1.1
NW
9
1.3
NW
9
1.3
NW
9
1.6
NW
11
1.4
NW
11
1.2
NW
10
1.3
NW
10
1.3
NW
9
1.2
NW
10
Wave Graph
Metric surfscale
Energy kJ
32
60
77
77
74
64
64
54
30
16
19
41
211
255
314
543
449
296
309
300
257
Wind (km/h)
25
NNW
20
NNW
20
NNW
25
NNW
25
NNW
25
NW
20
NNW
20
NNW
15
WNW
10
WNW
20
NNW
15
SW
20
WSW
15
W
20
SW
25
WNW
25
NW
15
WNW
20
NW
25
NW
15
W
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross-off
cross-off
cross
cross-off
cross-on
cross-on
cross
cross-on
cross-on
cross-off
High Tide
10:47AM1.31m
11:27PM1.53m
11:36AM1.22m
00:19AM1.35m
12:45PM1.16m
1:32AM1.21m
2:27PM1.15m
3:07AM1.16m
3:55PM1.22m
4:19AM1.19m
4:53PM1.32m
5:09AM1.26m
5:36PM1.44m
Low Tide
5:06PM0.33m
6:05AM0.53m
5:58PM0.49m
6:55AM0.61m
7:05PM0.62m
8:00AM0.66m
8:37PM0.69m
9:20AM0.65m
10:15PM0.66m
10:33AM0.59m
11:22PM0.58m
11:26AM0.49m
00:07AM0.49m
cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
cloud
cloud
light rain
cloud
part cloud
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:15
5:16
5:18
5:20
5:20
5:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:52
9:50
9:49
9:46
9:45
9:44
9:42
 mm
3
Temp °C
13
14
13
12
12
12
14
15
14
17
17
14
19
18
14
14
15
13
15
16
14
Feels °C
9
10
10
7
7
8
11
12
12
15
13
12
15
15
12
10
11
9
12
11
11
  • 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 
submit an eyeball surf report

Quick surf report for Castlerock:

join our community of surf reporters

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.


Information about the Castlerock Surf forecast

The above surf forecast table for Castlerock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castlerock can be found by selecting the local surf guide option on the grey menu. Our Castlerock surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Castlerock) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Castlerock may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a holiday in Londonderry? If you are looking for accommodation near Castlerock, camping, hotels and holiday cottages in Londonderry, consider staying in Coleraine which is 8 km (5 miles) away. Other places in and around Londonderry where you can find information about places to rent, and car hire include Ballycastle which is 34 km (21 miles) away, Ballypatrick, Londonderry County Borough and Derry.

Nearest locationNearest