Castlerock Surf Break

Lat Long: 55.17° N 6.78° W

Castlerock Surf Forecast and Surf Report

Issued: 12 am 19 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 19 Oct 2026:

  • Best quality surf: Saturday 24 Oct, 7AM (local time) - 7.5ft (2.3m), 14s period, NW swell with offshore winds.
  • Most powerful swell: Monday 26 Oct, 12AM (local time) - 11ft (3.5m), 16s period, NW swell with 6,715 kJ wave energy.
  • Next surfable swell (1★+): Monday 19 Oct, 7AM (local time) - 2ft (0.6m), 16s 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 Monday (Oct 19) at 7AM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.4m and 12s. 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 16s and forecast to arrive on Monday (Oct 26) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Sunday (Oct 25) at 6PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Mon 19th Oct)2ft (0.6m) 16s
Best Surf 7AM (Sat 24th Oct)7.5ft (2.3m) 14s
Most Powerful12AM (Mon 26th Oct)11ft (3.5m) 16s

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


Short Range Forecast

Moderate rain (total 14mm), heaviest on Tue night. Very mild (max 12°C on Tue morning, min 7°C on Sun night). Winds increasing (light winds from the SSE on Mon morning, near gales from the WNW by Wed morning).

Days 4-6 Weather Summary

Heavy rain (total 45mm), heaviest during Thu night. Very mild (max 13°C on Sat afternoon, min 7°C on Wed night). Mainly gales.

Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Saturday
24
Sunday
25
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
2
2
1
1
1
0
0
3
1
2
0
0
0
1
4
0
1
0
1
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
NW
16
1.3
NW
15
1.4
NW
14
1.2
NW
13
1.1
NW
13
1
NW
13
1.5
NW
12
3
WNW
12
2.2
NW
13
1.1
NW
12
1.1
NW
12
1.1
NW
11
1.3
NW
12
1
NW
12
1.6
NW
13
2.2
NW
14
1.8
NW
13
1.1
NW
12
1.3
WNW
11
2.1
WNW
11
3.5
NW
16
Wave Graph
Metric surfscale
Energy kJ
352
705
791
503
380
325
625
2502
1594
367
355
308
433
292
854
1822
1053
349
359
1068
6715
Wind (km/h)
10
SSE
20
ESE
15
SE
25
SE
20
SE
20
SE
55
WNW
45
WNW
15
SSW
20
SSW
15
S
40
N
50
WNW
45
WSW
30
W
20
SSE
45
SSE
30
S
40
WSW
40
WSW
35
SW
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-off
cross-off
off
on
cross
cross-off
cross
off
cross-off
off
cross-off
cross-off
cross-off
High Tide
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
5:59AM1.67m
6:14PM1.93m
Low Tide
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
12:07PM0.13m
00:40AM0.06m
part cloud
part cloud
clear
part cloud
cloud
rain showers
mod rain
part cloud
part cloud
part cloud
cloud
heavy rain
rain showers
light rain
part cloud
light rain
mod rain
rain showers
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
8:03
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8:04
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8:07
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8:08
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8:11
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8:12
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7:15
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<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
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6:19
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—
6:16
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6:14
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6:12
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6:09
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6:07
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5:05
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 mm
—
—
—
—
—
7
7
—
—
—
—
32
2
2
—
2
7
4
—
—
1
Temp °C
10
11
10
12
11
10
9
10
8
11
11
9
9
9
9
9
13
14
10
10
8
Feels °C
7
7
7
6
6
5
-1
0
3
5
7
-2
-2
-3
-1
1
9
9
0
1
0
  • 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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