Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 6 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castlerock sea temperature is
15.7°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 Sep 2026:

  • Best quality surf: Saturday 5 Sep, 1PM (local time) - 4.5ft (1.3m), 10s period, NW swell with cross-offshore winds.
  • Most powerful swell: Tuesday 8 Sep, 1PM (local time) - 11ft (3.5m), 12s period, NW swell with 3,214 kJ wave energy.
  • Next surfable swell (1★+): Saturday 5 Sep, 1PM (local time) - 4.5ft (1.3m), 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 Saturday (Sep 05) at 1PM. The primary swell is predicted to be 1.3m 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 3.5m 12s and forecast to arrive on Tuesday (Sep 08) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Sunday (Sep 06) at 4PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Sat 5th Sep)4.5ft (1.3m) 10s
Best Surf 1PM (Sat 5th Sep)4.5ft (1.3m) 10s
Most Powerful 1PM (Tue 8th Sep)11ft (3.5m) 12s

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


Short Range Forecast

Mostly dry. Warm (max 20°C on Sun afternoon, min 12°C on Fri night). Winds decreasing (strong winds from the W on Fri morning, calm by Sat afternoon).

Days 4-6 Weather Summary

Moderate rain (total 12mm), heaviest on Wed afternoon. Very mild (max 17°C on Mon afternoon, min 12°C on Mon night). Winds decreasing (strong winds from the W on Tue morning, light winds from the SW by Wed night).

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
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)
0
0
1
2
2
0
0
0
0
0
0
0
0
0
1
2
1
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)
2.3
WNW
12
2.2
WNW
12
1.9
NW
12
1.6
NW
10
1.2
NW
10
0.8
NW
9
0.4
NW
8
0.3
WNW
9
0.4
WNW
8
0.7
NW
8
0.9
WNW
9
1.4
WNW
11
3
NW
12
3.5
NW
12
3
NW
11
1.9
NW
10
1.3
NW
9
0.8
NW
8
0.5
NW
8
0.5
NW
7
1
WNW
7
Wave Graph
Metric surfscale
Energy kJ
1614
1384
1059
523
257
109
15
15
22
62
132
433
2524
3172
1750
681
260
80
28
25
91
Wind (km/h)
40
W
40
W
30
W
20
WSW
5
SW
25
S
25
S
25
S
20
W
25
SW
30
SSW
30
WSW
40
W
40
W
30
W
20
SW
25
SSE
20
SW
30
WSW
35
W
30
W
Wind State
cross
cross
cross
cross-off
glassy
off
off
off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross
cross-off
off
cross-off
cross-off
cross
cross
High Tide
11:21AM1.31m
00:04AM1.23m
1:05PM1.23m
2:14AM1.15m
3:13PM1.33m
3:55AM1.24m
4:26PM1.54m
4:53AM1.37m
5:16PM1.76m
5:36AM1.49m
5:58PM1.94m
6:13AM1.60m
6:36PM2.05m
Low Tide
5:44PM0.59m
6:33AM0.65m
8:00PM0.66m
8:41AM0.64m
10:04PM0.55m
10:11AM0.50m
11:12PM0.38m
11:05AM0.32m
11:58PM0.22m
11:48AM0.16m
00:37AM0.11m
12:25PM0.03m
1:11AM0.05m
clear
part cloud
clear
cloud
part cloud
cloud
cloud
part cloud
part cloud
part cloud
light rain
rain showers
clear
part cloud
part cloud
cloud
light rain
rain showers
rain showers
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:37
6:39
6:41
6:43
6:45
6:46
6:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:13
8:10
8:07
8:06
8:02
8:00
7:58
 mm
3
2
5
2
1
Temp °C
16
15
13
16
17
16
18
20
18
16
17
12
14
14
14
15
13
15
15
15
13
Feels °C
9
8
7
13
16
14
14
16
15
11
11
6
6
6
9
11
8
12
10
9
6
  • 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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