Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle12 Day Weather and Surf, issued 5 pm Thursday 08 Jan 2026 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
9.4° C
(Which is normal for this time of year)


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 Friday (Jan 09) at 12AM. The primary swell is predicted to be 1.1m and 12s period with a secondary swell of 0.6m and 14s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Castlerock in the next 12 days are 2.2m 18s and forecast to arrive on Thursday (Jan 15) at 3PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Jan 11) at 9AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 9th Jan)3.5ft (1.1m) 12s
Best Surf12PM (Thu 15th Jan)7ft (2.1m) 19s
Most Powerful 3PM (Thu 15th Jan)7ft (2.2m) 18s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Moderate rain (total 15mm), heaviest on Sat night. Mild temperatures (max 9°C on Sun morning, min 3°C on Sat morning). Winds increasing (calm on Thu afternoon, strong winds from the S by Sat night).

Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Sun afternoon. Very mild (max 11°C on Sun afternoon, min 3°C on Wed morning). Winds decreasing (near gales from the W on Mon night, light winds from the SW by Wed morning).

Thu
08
Friday
09
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
2
2
1
0
2
3
2
0
0
0
0
1
0
0
3
0
2
3
1
1
4
Swell
Height Map
Wave Height (m) & direction (?)
1.4
NW
1.1
NW
1.2
NW
1.1
NW
1.3
WNW
1.4
NW
1.2
WNW
0.9
NW
0.5
WNW
0.5
WNW
0.5
WNW
0.9
WNW
1
WNW
2
NW
2
NW
1.9
NW
2.1
NW
1.8
NW
1.4
NW
0.9
NW
1.6
NW
Period(s) (?)111213121413121010121213131412121111111020
Wave
Graph
(?)Metric surfscale
Energy kJ (?)48829847331961759435914557838525332614291169100710837574671421819
Wind
(km/h)
0
SW
5
NNE
10
W
15
WNW
10
NW
15
S
20
S
40
SSE
40
S
30
SSE
35
SSW
35
S
50
SSW
45
W
25
WSW
25
NNW
15
WNW
15
SW
20
SW
25
S
20
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glassglasscrosscrosscross-
on
offoffoffoffoffoffoffoffcrosscross-
off
cross-
on
crosscross-
off
cross-
off
offoff
High Tide
/ height (m)
9:18PM
1.30
10:01AM
1.62
10:00PM
1.21
10:47AM
1.46
10:54PM
1.14
11:45AM
1.30
12:19AM
1.09
1:09PM
1.20
2:08AM
1.13
2:36PM
1.19
3:21AM
1.22
3:37PM
1.23
4:09AM
1.34
Low Tide
/ height (m)
4:00PM
0.42
3:36AM
0.27
4:43PM
0.52
4:21AM
0.41
5:31PM
0.60
5:16AM
0.55
6:28PM
0.66
6:31AM
0.66
7:39PM
0.67
8:08AM
0.69
8:57PM
0.63
9:37AM
0.64
9:58PM
0.55
10:36AM
0.55
Thu
08
Friday
09
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Sunrise--8:48--8:48--8:47--8:47--8:45--8:45--8:44
Sunset4:16--4:17--4:20--4:22--4:22--4:24--4:27--
cloud
light rain
light rain
rain showers
rain showers
part cloud
cloud
mod rain
light rain
light rain
light rain
cloud
light rain
part cloud
rain showers
light rain
rain showers
cloud
cloud
part cloud
part cloud
Rain (mm)
-1122--6321-1-111----
Temp. °C555544479111110975554635
Feels °C (?)3210-1-1-1-31311-2-5-1-2-1-11-30
  • 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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