Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 12 am 04 Oct 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
14.7°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 4 Oct 2026:

  • Best quality surf: Thursday 8 Oct, 7AM (local time) - 5ft (1.6m), 11s period, NW swell with cross-offshore winds.
  • Most powerful swell: Monday 5 Oct, 10PM (local time) - 6ft (1.8m), 13s period, NW swell with 1,162 kJ wave energy.
  • Next surfable swell (1★+): Sunday 4 Oct, 7AM (local time) - 3ft (0.9m), 11s 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 04) at 7AM. The primary swell is predicted to be 0.9m and 11s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 16 days are 1.8m 13s and forecast to arrive on Monday (Oct 05) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Monday (Oct 05) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Sun 4th Oct)3ft (0.9m) 11s
Best Surf 7AM (Thu 8th Oct)5ft (1.6m) 11s
Most Powerful10PM (Mon 5th Oct)6ft (1.8m) 13s

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


Short Range Forecast

Light rain (total 8mm), mostly falling on Mon afternoon. Very mild (max 18°C on Sun afternoon, min 10°C on Mon night). Winds decreasing (fresh winds from the SW on Sun night, light winds from the WNW by Mon night).

Days 4-6 Weather Summary

Light rain (total 9mm), mostly falling on Thu night. Very mild (max 15°C on Thu night, min 9°C on Tue night). Winds increasing (light winds from the WNW on Tue night, fresh winds from the WSW by Thu night).

Sunday
4
Monday
5
Tuesday
6
Wednesday
7
Thursday
8
Friday
9
Saturday
10
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
1
1
2
1
3
1
0
1
0
0
1
2
2
0
0
0
0
0
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)
1
NW
11
1.1
NW
11
1.6
NW
13
1.5
NW
12
1.5
NW
11
1.8
NW
13
1.5
NW
11
1.3
NW
10
1.3
NW
10
1.2
NW
10
1.4
NW
10
1.7
NW
11
1.4
NW
11
1.2
NW
11
1.1
NW
10
1.4
WNW
10
0.8
WNW
12
1.1
NW
7
1.2
NW
8
1.7
NW
13
1.7
NW
12
Wave Graph
Metric surfscale
Energy kJ
224
297
821
594
515
1075
505
362
344
296
388
721
475
326
211
394
164
105
173
976
827
Wind (km/h)
20
SSW
25
SSW
25
SW
25
SW
15
W
10
WNW
10
NW
15
NW
15
W
20
WNW
30
WNW
25
WNW
15
SW
20
SSE
35
WSW
35
WNW
35
W
25
W
35
W
35
WNW
40
W
Wind State
off
cross-off
cross-off
cross-off
cross
cross-on
cross-on
cross-on
cross
cross
cross-on
cross
cross-off
off
cross-off
cross
cross
cross
cross
cross
cross
High Tide
1:15PM1.32m
2:24AM1.08m
3:10PM1.45m
3:50AM1.20m
4:13PM1.64m
4:39AM1.34m
4:59PM1.80m
5:18AM1.47m
5:37PM1.91m
5:53AM1.59m
6:11PM1.96m
6:26AM1.68m
6:43PM1.95m
Low Tide
6:29AM0.65m
8:33PM0.62m
8:29AM0.60m
10:05PM0.48m
9:49AM0.46m
10:59PM0.33m
10:42AM0.31m
11:39PM0.21m
11:25AM0.18m
00:13AM0.13m
12:02PM0.08m
00:42AM0.08m
12:36PM0.04m
1:09AM0.08m
cloud
cloud
cloud
cloud
light rain
light rain
part cloud
clear
clear
clear
part cloud
part cloud
light rain
light rain
light rain
rain showers
clear
part cloud
rain showers
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:33
—
—
7:35
—
—
7:37
—
—
7:39
—
—
7:41
—
—
7:43
—
—
7:45
—
—
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
—
6:55
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—
6:53
—
—
6:51
—
—
6:49
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—
6:45
—
—
6:44
—
—
6:40
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 mm
—
—
—
—
3
5
—
—
—
—
—
—
1
2
4
2
—
—
1
—
2
Temp °C
16
18
17
15
15
11
12
12
11
12
12
11
10
10
15
13
13
11
12
12
12
Feels °C
12
15
14
11
13
9
10
8
8
5
5
5
7
6
9
7
6
5
5
4
5
  • 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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