Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 12 pm 18 Oct 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
13.9°C
1.4° 

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


Castlerock surf forecast from 18 Oct 2026:

  • Best quality surf: Sunday 25 Oct, 3AM (local time) - 10ft (3.0m), 14s period, NW swell with offshore winds.
  • Most powerful swell: Sunday 25 Oct, 9AM (local time) - 11ft (3.5m), 15s period, NW swell with 4,823 kJ wave energy.
  • Next surfable swell (1★+): Sunday 18 Oct, 7PM (local time) - 2.5ft (0.7m), 14s period with WNW 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 (Oct 18) at 7PM. The primary swell is predicted to be 0.7m and 14s period with a secondary swell of 0.4m and 10s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 16 days are 3.5m 15s and forecast to arrive on Sunday (Oct 25) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Saturday (Oct 24) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Sun 18th Oct)2.5ft (0.7m) 14s
Best Surf 3AM (Sun 25th Oct)10ft (3.0m) 14s
Most Powerful 9AM (Sun 25th Oct)11ft (3.5m) 15s

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


Short Range Forecast

Some drizzle, heaviest during Tue night. Very mild (max 12°C on Tue morning, min 7°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Wed morning. Very mild (max 11°C on Thu morning, min 7°C on Wed morning). Mainly strong winds.

Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Saturday
24
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
2
2
2
1
1
1
2
0
3
1
1
0
0
0
1
3
3
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
NW
10
0.5
NW
15
0.5
WNW
13
0.8
NW
16
1.3
NW
15
1.3
NW
14
1.1
NW
13
1.1
NW
13
1
NW
13
1.5
NW
12
3
NW
10
1.9
NW
13
1.1
NW
12
1.2
WNW
12
1.1
WNW
11
1.7
NW
6
1.9
NW
12
1.9
NW
12
1.6
NW
12
1.7
WNW
12
2.5
NW
14
Wave Graph
Metric surfscale
Energy kJ
85
115
96
352
788
706
451
374
320
624
2011
1247
386
371
297
224
1007
1048
678
795
2448
Wind (km/h)
10
SSE
10
SE
15
SSE
10
S
20
ESE
15
SE
20
SE
20
SE
25
SE
25
WSW
40
W
15
SW
20
SW
20
SW
25
WNW
35
WNW
40
WNW
30
WNW
15
SW
20
S
25
SSE
Wind State
off
cross-off
off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-on
cross
cross-on
cross
cross-off
off
off
High Tide
11:22AM1.20m
11:25PM0.98m
2:03PM1.18m
2:35AM0.98m
3:28PM1.30m
3:42AM1.11m
4:06PM1.45m
4:20AM1.25m
4:37PM1.60m
4:53AM1.40m
5:08PM1.74m
5:26AM1.54m
5:40PM1.85m
Low Tide
7:02PM0.81m
6:52AM0.71m
8:58PM0.76m
8:34AM0.65m
10:01PM0.64m
9:38AM0.54m
10:40PM0.49m
10:22AM0.42m
11:11PM0.35m
10:59AM0.31m
11:41PM0.22m
11:33AM0.21m
00:10AM0.12m
clear
clear
clear
clear
part cloud
part cloud
cloud
cloud
rain showers
light rain
rain showers
cloud
clear
light rain
part cloud
rain showers
rain showers
part cloud
part cloud
light rain
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
8:00
—
—
8:03
—
—
8:04
—
—
8:07
—
—
8:08
—
—
8:11
—
—
8:12
—
—
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
—
6:22
—
—
6:19
—
—
6:16
—
—
6:14
—
—
6:12
—
—
6:09
—
—
6:07
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 mm
—
—
—
—
—
—
—
—
1
3
1
—
—
1
—
2
1
—
—
1
4
Temp °C
8
10
8
10
11
10
12
12
10
8
10
7
11
11
9
9
10
9
11
11
15
Feels °C
4
7
4
7
7
7
7
7
5
3
1
2
6
6
5
1
0
1
7
6
12
  • 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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