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Surf Forecasts:

Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle12 Day Weather and Surf, issued 12 am Saturday 18 Oct 2025 BST
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
13.8° C
 (Which is 1.3°C warmer than 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 Wednesday (Oct 22) at 4AM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 0.1m 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 4.5m 10s and forecast to arrive on Saturday (Oct 25) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Sunday (Oct 19) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Wed 22nd Oct)4.5ft (1.3m) 7s
Best Surf 4AM (Wed 22nd Oct)4.5ft (1.3m) 7s
Most Powerful 7AM (Sat 25th Oct)15ft (4.5m) 10s

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 Moderate rain (total 14mm), heaviest on Sat night. Very mild (max 13°C on Sat morning, min 10°C on Fri night). Winds decreasing (strong winds from the SE on Sat night, calm by Sun night).

Days 3-6 Weather Summary Heavy rain (total 53mm), heaviest during Wed night. Very mild (max 14°C on Wed night, min 7°C on Thu morning). Winds increasing (light winds from the SW on Tue night, severe gales from the NNW by Thu morning).

Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Fri
24
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.2
NNW
0.1
N
0.1
N
0.1
W
0.1
W
0.1
W
0.2
W
0.1
W
0.1
W
0.2
NNW
1.6
NNW
1.9
NNW
1.7
NNW
0.9
NNW
0.7
NNW
0.4
NNW
0.2
NNW
0.5
NNW
1.4
NNW
2.5
NNW
3
NNW
Period(s) (?)69812111112111110887661191215149
Wave
Graph
(?)Metric surfscale
Energy kJ (?)42232211331031846429462344788778429271346
Wind
(km/h)
20
ESE
30
SE
30
SE
40
SE
35
SE
15
SE
10
SSE
5
SSE
10
NNW
15
W
35
NNW
30
NW
10
W
15
SSE
25
E
20
SE
80
NNW
65
NW
50
W
55
WSW
35
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		glassoncrosscross-
on		cross-
on		crossoffcrosscross-
off		oncross-
on		crosscross-
off		cross
High Tide
/ height (m)
5:09AM
1.38
5:25PM
1.77
5:39AM
1.49
5:54PM
1.81
6:07AM
1.59
6:21PM
1.82
6:34AM
1.66
6:48PM
1.80
7:01AM
1.71
7:14PM
1.74
7:28AM
1.72
7:41PM
1.66
7:56AM
1.70
Low Tide
/ height (m)
11:29PM
0.31
11:11AM
0.28
11:57PM
0.24
11:45AM
0.20
12:22AM
0.18
12:17PM
0.15
12:46AM
0.16
12:47PM
0.14
1:09AM
0.15
1:16PM
0.15
1:32AM
0.18
1:46PM
0.19
1:55AM
0.23
2:16PM
0.27
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Fri
24
Sunrise-8:00--8:03--8:04--8:07--8:08--8:11--8:12-
Sunset--6:22--6:19--6:16--6:14--6:12--6:09--6:07
cloud
cloud
cloud
mod rain
light rain
rain showers
clear
clear
part cloud
light rain
light rain
clear
part cloud
cloud
heavy rain
heavy rain
mod rain
light rain
light rain
rain showers
mod rain
Rain (mm)
---941---21---122783496
Temp. °C12131312131312131312121210910148771010
Feels °C (?)7774810101311105555111-8-7-613
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Londonderry

  1. weather stationWind Update The wind is still cross-off at Castlerock (fresh winds from the SE at Magilligan Number 2 11 km from Castlerock). 0.1m 6s windswell from the NNW to make surfable waves.

    1 hour 10 minutes ago Castlerock
Expand
<
>
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1 h 10 min ago

30 km/h
SE
Cross-Off
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

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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