Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 12 am 12 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.5°C
1.5° 

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


Castlerock surf forecast from 12 Sep 2026:

  • Best quality surf: Sunday 13 Sep, 7AM (local time) - 3.5ft (1.1m), 11s period, NW swell with cross-offshore winds.
  • Most powerful swell: Friday 18 Sep, 1AM (local time) - 8ft (2.4m), 13s period, NW swell with 2,042 kJ wave energy.
  • Next surfable swell (1★+): Sunday 13 Sep, 7AM (local time) - 3.5ft (1.1m), 11s 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 13) at 7AM. The primary swell is predicted to be 1.1m and 11s 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 2.4m 13s and forecast to arrive on Friday (Sep 18) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Saturday (Sep 19) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Sun 13th Sep)3.5ft (1.1m) 11s
Best Surf 7AM (Sun 13th Sep)3.5ft (1.1m) 11s
Most Powerful 1AM (Fri 18th Sep)8ft (2.4m) 13s

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


Short Range Forecast

Moderate rain (total 15mm), heaviest on Fri night. Warm (max 20°C on Mon afternoon, min 11°C on Sat night). Winds decreasing (fresh winds from the SSW on Fri night, light winds from the SSW by Sat night).

Days 4-6 Weather Summary

Moderate rain (total 10mm), heaviest on Wed night. Very mild (max 17°C on Mon night, min 12°C on Tue night). Mainly fresh winds.

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
1
2
1
1
0
0
0
0
0
0
0
1
0
0
1
2
3
3
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
NW
12
1.6
NW
13
1.3
NW
12
1.1
NW
11
0.9
NW
10
0.7
NW
9
0.5
NW
9
0.4
NW
8
0.4
WNW
9
0.5
WNW
10
0.4
WNW
10
1.3
NW
6
1.3
NNW
8
1.3
NW
10
0.9
WNW
9
1.6
NW
10
2.3
NW
13
2.4
NW
13
2.2
NW
13
1.9
NW
12
1.4
NW
11
Wave Graph
Metric surfscale
Energy kJ
666
865
442
258
167
87
38
18
26
59
39
145
213
293
135
570
1703
2042
1619
1083
501
Wind (km/h)
25
WSW
20
NW
10
W
10
SSW
5
SSE
15
S
15
S
20
SSW
25
W
25
W
30
W
35
NW
15
NW
20
WSW
25
WSW
30
W
30
W
25
WSW
25
WSW
20
WSW
20
SW
Wind State
cross-off
cross-on
cross
off
off
off
off
off
cross
cross
cross
cross-on
cross-on
cross-off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-off
High Tide
7:21AM1.71m
7:44PM2.04m
7:53AM1.72m
8:15PM1.93m
8:23AM1.69m
8:45PM1.78m
8:53AM1.63m
9:13PM1.60m
9:24AM1.54m
9:41PM1.41m
9:56AM1.41m
10:10PM1.24m
10:35AM1.27m
10:47PM1.08m
Low Tide
1:33PM-0.05m
2:11AM0.08m
2:06PM-0.01m
2:38AM0.15m
2:39PM0.09m
3:04AM0.25m
3:12PM0.22m
3:29AM0.36m
3:47PM0.38m
3:55AM0.49m
4:27PM0.56m
4:27AM0.61m
5:28PM0.72m
rain showers
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rain showers
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cloud
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:52
6:54
6:56
6:58
7:00
7:01
7:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:52
7:50
7:47
7:45
7:43
7:39
7:37
 mm
2
5
2
1
1
2
4
Temp °C
17
15
13
15
18
16
19
20
17
15
15
13
13
15
14
13
14
13
15
15
13
Feels °C
14
12
12
14
17
14
16
18
13
10
9
7
9
11
10
7
8
8
10
10
9
  • 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
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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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