Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle12 Day Weather and Surf, issued 5 pm Saturday 06 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
10.9° 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 Sunday (Dec 07) at 3AM. The primary swell is predicted to be 1.0m and 15s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 12 days are 2.3m 16s and forecast to arrive on Friday (Dec 12) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Tuesday (Dec 09) at 6AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sun 7th Dec)3.5ft (1.0m) 15s
Best Surf12AM (Fri 12th Dec)7ft (2.1m) 17s
Most Powerful 3AM (Fri 12th Dec)7.5ft (2.3m) 16s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 34mm), heaviest during Sun morning. Very mild (max 15°C on Tue morning, min 8°C on Sat night). Winds increasing (light winds from the S on Sat afternoon, strong winds from the ESE by Mon night).

Days 3-6 Weather Summary Moderate rain (total 18mm), heaviest on Thu night. Very mild (max 12°C on Thu afternoon, min 8°C on Thu night). Winds decreasing (strong winds from the WSW on Tue afternoon, light winds from the SW by Thu night).

Sat
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
3
1
0
0
0
0
4
2
1
0
1
0
0
2
0
1
5
3
4
4
4
Swell
Height Map
Wave Height (m) & direction (?)
1.3
WNW
1
WNW
0.8
WNW
0.6
WNW
0.4
WNW
0.6
NW
1.2
NW
1.3
WNW
1
WNW
0.9
WNW
1.9
NW
1.5
WNW
1.6
NW
1.3
NW
1
WNW
1
WNW
2.1
NW
2.1
NW
1.4
NW
2.1
NW
1.6
NW
Period(s) (?)181514141321181616161310101013131716161715
Wave
Graph
(?)Metric surfscale
Energy kJ (?)94343422615666361968838545377130843949032234134126262061100123681088
Wind
(km/h)
15
S
20
SW
25
SE
25
W
25
SSW
30
SW
25
SSW
20
SSE
35
SSE
50
WSW
35
SW
40
SW
35
WSW
30
SSW
35
S
35
S
10
SSW
20
SW
15
S
15
S
25
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off
cross-
off
crossoffcross-
off
offcross-
off
offcross-
off
cross-
off
cross-
off
cross-
off
offoffoffoffcross-
off
offoffoff
High Tide
/ height (m)
6:50PM
1.69
7:14AM
1.93
7:34PM
1.56
8:02AM
1.88
8:18PM
1.42
8:54AM
1.79
9:05PM
1.28
9:51AM
1.68
9:57PM
1.15
10:56AM
1.56
11:07PM
1.07
12:11PM
1.47
12:40AM
1.06
Low Tide
/ height (m)
1:04AM
0.12
1:53PM
0.15
1:47AM
0.16
2:48PM
0.26
2:32AM
0.22
3:45PM
0.38
3:21AM
0.30
4:47PM
0.50
4:16AM
0.39
5:52PM
0.57
5:19AM
0.48
7:00PM
0.60
6:30AM
0.55
Sat
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Sunrise--8:37--8:37--8:38--8:41--8:41--8:42--8:44
Sunset3:59--3:59--3:57--3:57--3:57--3:56--3:56--
part cloud
part cloud
heavy rain
mod rain
part cloud
clear
part cloud
mod rain
light rain
clear
part cloud
clear
part cloud
part cloud
cloud
light rain
heavy rain
light rain
cloud
part cloud
clear
Rain (mm)
--139---93------1134---
Temp. °C101110109910111510101010111112108877
Feels °C (?)776442468-111253574430
  • Map Icons:
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  • 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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