Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle12 Day Weather and Surf, issued 11 am Wednesday 17 Dec 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Castlerock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castlerock sea temperature is
10.8° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Castlerock this week:

The surf forecast for Castlerock over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 17) at 9PM. The primary swell is predicted to be 1.7m and 14s period with a secondary swell of 0.1m and 10s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 12 days are 3.5m 20s and forecast to arrive on Thursday (Dec 18) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Saturday (Dec 20) at 9PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Wed 17th Dec)5.5ft (1.7m) 14s
Best Surf 9AM (Thu 18th Dec)11ft (3.5m) 20s
Most Powerful 6AM (Thu 18th Dec)11ft (3.5m) 20s

Table - best surf conditions forecast for Castlerock over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 5mm), mostly falling on Wed afternoon. Very mild (max 12°C on Wed morning, min 6°C on Thu morning). Winds increasing (moderate winds from the SSW on Wed night, strong winds from the SSW by Thu night).

Days 3-6 Weather Summary Moderate rain (total 12mm), heaviest on Sat night. Very mild (max 10°C on Sat morning, min 6°C on Sun morning). Winds decreasing (strong winds from the SE on Sat afternoon, light winds from the E by Mon night).

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
0
5
9
5
0
2
3
3
0
0
1
2
1
0
1
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.1
WNW
0.9
WNW
2.5
NW
3.5
NW
3
NW
2.5
NW
2.5
NW
2.5
NW
2.1
NW
1.1
NW
0.9
NW
0.8
WNW
1.6
NW
1.6
NW
1.2
NW
0.8
NW
0.6
NW
0.9
ENE
0.4
NW
0.3
NW
0.4
NW
Period(s) (?)13132020191816161412121316161413125101413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)41426152508613705543843137357317873982162091436122558119911442253343
Wind
(km/h)
30
S
30
SW
25
SSW
25
SSE
40
SSW
45
SSW
40
WSW
30
SW
30
SSE
40
SSE
40
SE
20
SE
30
ESE
25
E
25
E
20
ESE
25
ENE
35
E
20
E
15
ENE
20
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off
offoffcross-
off
cross-
off
cross-
off
cross-
off
offcross-
off
cross-
off
cross-
off
cross-
off
crosscrosscross-
off
crosscrosscrosscrosscross-
off
High Tide
/ height (m)
4:32PM
1.45
4:56AM
1.53
5:06PM
1.48
5:29AM
1.61
5:39PM
1.50
6:02AM
1.66
6:11PM
1.52
6:36AM
1.70
6:42PM
1.51
7:12AM
1.71
7:14PM
1.50
7:48AM
1.71
7:48PM
1.46
Low Tide
/ height (m)
10:39AM
0.44
10:53PM
0.36
11:20AM
0.38
11:27PM
0.31
11:58AM
0.35
12:01AM
0.27
12:34PM
0.33
12:34AM
0.23
1:10PM
0.35
1:06AM
0.21
1:45PM
0.38
1:37AM
0.21
2:21PM
0.42
2:07AM
0.23
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise8:48--8:48--8:48--8:49--8:49--8:51--8:51--
Sunset-3:56--3:56--3:57--3:57--3:57--3:59--4:00-
cloud
light rain
part cloud
cloud
rain showers
rain showers
rain showers
part cloud
cloud
cloud
light rain
mod rain
part cloud
cloud
light rain
cloud
cloud
light rain
cloud
light rain
light rain
Rain (mm)
-1--121---37--1--1-13
Temp. °C121188888891099789999888
Feels °C (?)653-1-1-2-111210014532444
  • 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 12 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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