Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 6 pm 17 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.5°C
1.7° 

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


Castlerock surf forecast from 17 Sep 2026:

  • Best quality surf: Sunday 20 Sep, 7PM (local time) - 6ft (1.8m), 12s period, NW swell with cross-offshore winds.
  • Most powerful swell: Friday 18 Sep, 1AM (local time) - 10ft (3.0m), 14s period, NW swell with 3,889 kJ wave energy.
  • Next surfable swell (1★+): Sunday 20 Sep, 7PM (local time) - 6ft (1.8m), 12s 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 Sunday (Sep 20) at 7PM. The primary swell is predicted to be 1.8m and 12s 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 3.0m 14s and forecast to arrive on Friday (Sep 18) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Saturday (Sep 19) at 1PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Sun 20th Sep)6ft (1.8m) 12s
Best Surf 7PM (Sun 20th Sep)6ft (1.8m) 12s
Most Powerful 1AM (Fri 18th Sep)10ft (3.0m) 14s

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


Short Range Forecast

Light rain (total 8mm), mostly falling on Fri morning. Very mild (max 16°C on Fri afternoon, min 11°C on Sat night). Mainly strong winds.

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Sun night. Warm (max 21°C on Mon afternoon, min 12°C on Sun night). Wind will be generally light.

Thu
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wednesday
23
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
3
2
1
0
2
0
1
1
3
2
2
1
1
0
2
2
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3.5
NW
13
3
NW
14
2.4
NW
13
1.9
NW
12
1.6
NW
11
1.8
WNW
11
2.1
NW
11
2.5
NW
12
2.3
NW
12
1.9
NW
12
1.6
NW
13
1.2
NW
12
1.1
NW
11
0.7
NW
10
0.6
WNW
10
0.6
WNW
10
0.9
NW
15
1.1
NW
13
1.1
NW
13
0.9
NW
12
Wave Graph
Metric surfscale
Energy kJ
3905
3889
1952
1031
629
742
1064
1765
1513
997
765
396
278
112
65
82
355
412
388
232
Wind (km/h)
40
W
35
W
25
SSW
30
WSW
30
WSW
35
WSW
35
WSW
35
W
25
W
15
WNW
20
SSE
15
SW
15
WSW
10
SSW
10
S
5
NNE
5
SSW
10
SSW
25
NW
10
NNE
Wind State
cross
cross
off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross
off
cross-off
cross-off
off
off
cross-on
glassy
cross-off
cross-on
cross-on
High Tide
10:10PM1.24m
10:35AM1.27m
10:47PM1.08m
11:48AM1.13m
00:31AM0.95m
3:29PM1.15m
3:56AM1.03m
4:25PM1.30m
4:33AM1.16m
4:57PM1.46m
5:01AM1.30m
5:23PM1.62m
Low Tide
4:27PM0.56m
4:27AM0.61m
5:28PM0.72m
5:29AM0.73m
7:38PM0.82m
7:54AM0.76m
9:57PM0.75m
9:43AM0.65m
10:51PM0.62m
10:35AM0.50m
11:24PM0.49m
11:11AM0.36m
11:53PM0.35m
part cloud
part cloud
light rain
light rain
rain showers
part cloud
cloud
clear
part cloud
part cloud
light rain
part cloud
clear
clear
part cloud
cloud
cloud
cloud
rain showers
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:03
7:05
7:07
7:09
7:11
7:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:39
7:37
7:35
7:31
7:30
7:27
7:23
 mm
4
2
2
4
1
Temp °C
14
13
13
16
16
14
14
12
14
14
14
19
21
19
19
19
16
17
12
11
Feels °C
6
6
7
12
12
6
7
4
8
10
12
19
21
18
20
19
17
16
8
7
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

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