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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
16 Day Weather and Surf, issued 6 pm Wednesday 27 May 2026 BSTForecast 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
11.8° C
(Which is slightly warmer than usual)Castlerock surf forecast from 27 May 2026:
- Best quality surf: Friday 29 May, 10PM (local time) - 2.5ft (0.7m), 8s period, NW swell with cross-offshore winds.
- Most powerful swell: Friday 29 May, 4PM (local time) - 2.5ft (0.8m), 8s period, WNW swell with 90 kJ wave energy.
- Next surfable swell (1★+): Friday 29 May, 10PM (local time) - 2.5ft (0.7m), 8s period with NW swell.
Best Forecast Surf Conditions for Castlerock this week:
The surf forecast for Castlerock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (May 29) at 10PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.1m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castlerock in the next 16 days are 0.8m 8s and forecast to arrive on Friday (May 29) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Thursday (May 28) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Fri 29th May) | 2.5ft (0.7m) 8s |
| Best Surf | 10PM (Fri 29th May) | 2.5ft (0.7m) 8s |
| Most Powerful | 4PM (Fri 29th May) | 2.5ft (0.8m) 8s |
Table - best surf conditions forecast for Castlerock over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastSome drizzle, heaviest during Thu night. Warm (max 21°C on Thu afternoon, min 12°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Mon afternoon. Very mild (max 17°C on Sat afternoon, min 11°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wed 27 | Thursday 28 | Friday 29 | Saturday 30 | Sunday 31 | Monday 1 | Tuesday 2 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
NNW 7 | NW 7 | NNW 6 | NW 9 | NW 11 | NW 9 | WNW 8 | NW 8 | NW 7 | NW 7 | WNW 12 | WNW 12 | WNW 13 | WNW 12 | W 11 | W 11 | W 10 | NW 4 | NNW 4 | WNW 14 | WNW 13 | |
19 | 11 | 4 | 3 | 5 | 14 | 90 | 65 | 27 | 18 | 27 | 15 | 17 | 14 | 10 | 2 | 8 | 10 | 11 | 36 | 33 | |
Wind (km/h) | |||||||||||||||||||||
cross-off | cross-off | cross-off | off | off | cross-off | cross-off | off | off | cross-off | off | cross-off | cross | off | off | cross-on | cross-on | cross | cross | cross-off | off | |
High Tide | 4:49PM1.38m | 5:02AM1.56m | 5:25PM1.48m | 5:37AM1.56m | 5:59PM1.56m | 6:11AM1.55m | 6:31PM1.62m | 6:43AM1.54m | 7:04PM1.66m | 7:15AM1.51m | 7:37PM1.67m | 7:47AM1.48m | 8:12PM1.65m | 8:19AM1.43m | |||||||
Low Tide | 10:53PM0.41m | 11:28AM0.34m | 11:38PM0.37m | 12:00PM0.30m | 00:18AM0.33m | 12:30PM0.28m | 00:56AM0.31m | 1:02PM0.27m | 1:33AM0.32m | 1:34PM0.28m | 2:10AM0.35m | 2:07PM0.29m | 2:47AM0.40m | ||||||||
 |  | | |  |  | | | |  | | |  | | | | | |  |  | | |
 | — | — | 4:58 | — | — | 4:58 | — | — | 4:56 | — | — | 4:56 | — | — | 4:54 | — | — | 4:54 | — | — | 4:52 |
 | — | 9:47 | — | — | 9:49 | — | — | 9:51 | — | — | 9:52 | — | — | 9:53 | — | — | 9:54 | — | — | 9:55 | 9:57 |
— | — | — | — | 1 | — | — | — | — | 2 | 2 | — | 1 | 2 | 2 | 5 | 1 | — | — | 7 | 5 | |
Temp °C | 19 | 17 | 18 | 21 | 16 | 16 | 16 | 14 | 17 | 17 | 14 | 14 | 15 | 12 | 13 | 13 | 12 | 15 | 15 | 13 | 14 |
16 | 15 | 14 | 18 | 14 | 13 | 13 | 12 | 14 | 14 | 13 | 11 | 11 | 10 | 12 | 12 | 10 | 13 | 13 | 10 | 11 | |
Swell 1 Height (m) Direction Period (s) | NNW 7 | NW 7 | NNW 6 | NW 6 | ESE 5 | NW 9 | W 12 | NW 8 | NW 7 | NW 7 | WNW 12 | WNW 6 | WNW 6 | WNW 5 | W 11 | W 11 | W 10 | W 10 | W 11 | WNW 14 | WNW 13 |
 kJ | 19 | 11 | 4 | 1 | 4 | 14 | 3 | 65 | 27 | 18 | 27 | 3 | 3 | 3 | 10 | 2 | 8 | 2 | 2 | 36 | 33 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | WNW 10 | NW 9 | NW 9 | NW 8 | WNW 7 | — | — | W 16 | WNW 13 | NW 7 | WNW 12 | WNW 13 | WNW 12 | NW 6 | — | N 9 | — | W 16 | NNW 4 | ESE 4 |
| kJ | 10 | 9 | 3 | 3 | 3 | 5 | — | — | 5 | 17 | 2 | 15 | 17 | 14 | 2 | — | 1 | — | 5 | 2 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | NW 11 | W 15 | — | — | — | W 10 | N 9 | N 10 | N 9 | N 9 | — | W 5 | — | — | W 14 | — | N 5 |
| kJ | — | — | — | — | 5 | 5 | — | — | — | 2 | 2 | 2 | 2 | 2 | — | 1 | — | — | 4 | — | 1 |
Wind waves Height (m) Direction Period (s) | E 3 | ESE 2 | ESE 4 | ESE 4 | — | SW 2 | WNW 8 | — | — | — | — | W 2 | — | — | — | — | — | NW 4 | NNW 4 | SE 2 | — |
| kJ | 3 | 1 | 16 | 20 | — | 2 | 90 | — | — | — | — | 1 | — | — | — | — | — | 10 | 11 | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 40 | 40 | 290 | 559 | 266 | 187 | 187 | 0 | 14 | 42 | 14 | 300 | 384 | 40 | 40 | 40 | 42 | 144 | 150 | 56 | 14 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 16 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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