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Surf Forecasts:

Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle12 Day Weather and Surf, issued 5 am Saturday 17 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
8.9° 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 Monday (Jan 19) at 9AM. The primary swell is predicted to be 0.7m and 19s period with a secondary swell of 0.5m and 11s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Castlerock in the next 12 days are 1.9m 16s and forecast to arrive on Tuesday (Jan 20) 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 2.3m 7s period and expected on Saturday (Jan 24) at 12AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Mon 19th Jan)2.5ft (0.7m) 19s
Best Surf12PM (Mon 19th Jan)4.5ft (1.3m) 17s
Most Powerful 6AM (Tue 20th Jan)6ft (1.9m) 16s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Mild temperatures (max 8°C on Sat morning, min 5°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 9mm), mostly falling on Tue night. Mild temperatures (max 8°C on Tue afternoon, min 5°C on Wed morning). Winds increasing (moderate winds from the SE on Wed morning, strong winds from the ESE by Thu night).

Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
0
0
0
0
0
2
4
4
4
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.8
WNW
0.7
WNW
0.6
WNW
0.6
WNW
0.4
WNW
0.3
WNW
0.7
NW
1.7
NW
1.8
NW
1.8
NW
1.4
NW
1.1
NW
0.7
NW
0.6
WNW
0.6
WNW
0.8
NW
1.1
NW
0.8
WNW
0.7
WNW
0.5
WNW
0.9
WNW
Period(s) (?)13121110109191616161514131212201715131316
Wave
Graph
(?)Metric surfscale
Energy kJ (?)21913182653816350147415711494868447178999845967127515196387
Wind
(km/h)
15
SE
20
ESE
20
SE
20
SSE
20
SSE
15
SSE
15
SSE
20
SSE
15
SE
25
SSE
35
SE
45
SE
20
SE
40
SE
35
ESE
30
SE
40
SE
30
ESE
45
ESE
30
ESE
35
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		cross-
off		offcross-
off		cross-
off		offcross-
off		offcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross
High Tide
/ height (m)
5:29PM
1.47
5:56AM
1.68
6:00PM
1.53
6:28AM
1.77
6:31PM
1.57
7:00AM
1.84
7:02PM
1.59
7:32AM
1.88
7:35PM
1.58
8:06AM
1.88
8:09PM
1.55
8:40AM
1.84
8:46PM
1.49
Low Tide
/ height (m)
11:55AM
0.38
11:55PM
0.24
12:29PM
0.32
12:26AM
0.16
1:01PM
0.29
12:55AM
0.10
1:33PM
0.27
1:22AM
0.07
2:04PM
0.27
1:50AM
0.08
2:35PM
0.29
2:19AM
0.12
3:09PM
0.33
2:51AM
0.20
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Sunrise8:41--8:40--8:38--8:37--8:36--8:34--8:33--
Sunset-4:31--4:34--4:36--4:37--4:39--4:42--4:44-
part cloud
clear
clear
clear
cloud
cloud
cloud
cloud
clear
part cloud
part cloud
light rain
clear
part cloud
rain showers
part cloud
rain showers
part cloud
light rain
mod rain
light rain
Rain (mm)
-----------5--3-1-173
Temp. °C886785676788778888765
Feels °C (?)432230123-1-1-20-221-1-2-4-2-2
  • 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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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castlerock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Castlerock at:
surf-forecast.com

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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