Castlerock surf break

Castlerock surfForecast / Londonderry / Ireland

information circle12 Day Weather and Surf, issued 12 am Sunday 07 Sep 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
15.8° C
(Which is 1.6°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 Monday (Sep 08) at 7AM. The primary swell is predicted to be 1.4m and 11s 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 2.5m 13s and forecast to arrive on Sunday (Sep 14) at 7AM. 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 6s period and expected on Sunday (Sep 07) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Mon 8th Sep)4.5ft (1.4m) 11s
Best Surf 4AM (Sun 14th Sep)8ft (2.4m) 12s
Most Powerful 7AM (Sun 14th Sep)8ft (2.5m) 13s

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 12mm), heaviest on Sun afternoon. Very mild (max 18°C on Sat night, min 10°C on Sun night). Winds decreasing (strong winds from the SE on Sat night, light winds from the S by Mon afternoon).

Days 3-6 Weather Summary Moderate rain (total 15mm), heaviest on Fri afternoon. Very mild (max 15°C on Wed afternoon, min 10°C on Wed night). Mainly fresh winds.

Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Sat
13
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
1
3
2
3
1
0
1
1
0
0
0
0
0
0
0
1
1
0
Swell
Height Map
Wave Height (m) & direction (?)
0.8
NW
0.6
NW
0.5
NW
1
WNW
1.5
NW
1.6
NW
1.7
NW
1.4
NW
1.2
NW
1
NW
0.9
NW
0.8
NW
0.7
NW
0.5
NW
0.9
WNW
1.3
WNW
1.3
WNW
1.2
WNW
1.2
WNW
1.2
NW
1.2
NW
Period(s) (?)111111111111121111111010989111212131212
Wave
Graph
(?)Metric surfscale
Energy (?)14797572305446067734973322351991469768143359449353444414389
Wind
(km/h)
40
SE
40
SE
15
S
20
SW
20
SSW
20
SSW
15
SSE
25
SE
35
SE
20
SSE
15
S
20
SW
20
SSW
30
SW
35
W
25
SW
30
SW
25
SW
30
SSW
25
WSW
20
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
offcross-
off
offcross-
off
offcross-
off
cross-
off
cross-
off
offcross-
off
cross-
off
cross-
off
crosscross-
off
cross-
off
cross-
off
offcross-
off
cross
High Tide
/ height (m)
6:28AM
1.64
6:51PM
2.02
7:02AM
1.72
7:25PM
2.11
7:37AM
1.76
8:00PM
2.12
8:13AM
1.76
8:37PM
2.04
8:50AM
1.72
9:15PM
1.87
9:30AM
1.64
9:57PM
1.65
10:14AM
1.51
Low Tide
/ height (m)
12:52AM
0.16
12:42PM
0.03
1:23AM
0.06
1:13PM
-0.04
1:55AM
0.02
1:45PM
-0.07
2:27AM
0.03
2:20PM
-0.04
3:00AM
0.11
2:59PM
0.05
3:35AM
0.23
3:42PM
0.19
4:13AM
0.38
4:36PM
0.38
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Sat
13
Sunrise-6:43--6:45--6:46--6:48--6:50--6:52--6:54-
Sunset--8:06--8:02--8:00--7:58--7:54--7:52--7:50
cloud
light rain
rain showers
part cloud
clear
rain showers
part cloud
cloud
light rain
cloud
light rain
light rain
part cloud
rain showers
thunderstorm
rain showers
rain showers
light rain
rain showers
clear
rain showers
Rain (mm)
-37--1--1-31-321234-1
Temp. °C181715131516121514141315121413111314131415
Feels °C (?)11111310101198710111287657871010
  • 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 (strong winds from the SE at Magilligan Point 11 km from Castlerock). 0.9m 11s groundswell from the NW to make surfable waves.

    Castlerock
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2 h 11 min ago

39 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.


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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