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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
16 Day Weather and Surf, issued 12 am Monday 18 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
10.7° 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 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (May 18) at 7AM. The primary swell is predicted to be 0.9m and 12s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Castlerock in the next 16 days are 0.9m 12s and forecast to arrive on Monday (May 18) at 7AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Tuesday (May 19) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 18th May) | 3ft (0.9m) 12s |
| Best Surf | 7AM (Mon 18th May) | 3ft (0.9m) 12s |
| Most Powerful | 7AM (Mon 18th May) | 3ft (0.9m) 12s |
Table - best surf conditions forecast for Castlerock over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 18mm), heaviest on Mon night. Very mild (max 15°C on Wed afternoon, min 7°C on Sun night). Winds increasing (calm on Sun night, fresh winds from the SE by Mon night). | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Fri night. Warm (max 20°C on Fri afternoon, min 12°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
NW 11 | WNW 11 | WNW 10 | NW 10 | WNW 9 | NW 16 | WNW 14 | WNW 13 | WNW 12 | NW 8 | WNW 11 | W 11 | WNW 13 | WNW 13 | W 10 | WNW 9 | W 11 | WNW 10 | W 9 | W 9 | W 9 | |
176 | 149 | 67 | 23 | 8 | 64 | 160 | 99 | 81 | 17 | 39 | 9 | 33 | 16 | 7 | 8 | 2 | 9 | 2 | 2 | 2 | |
Wind (km/h) | |||||||||||||||||||||
glassy | cross-off | cross-off | off | off | cross-off | off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | on | glassy | glassy | cross-on | off | |
High Tide | 7:39AM1.80m | 8:01PM1.88m | 8:25AM1.67m | 8:49PM1.85m | 9:12AM1.51m | 9:42PM1.78m | 10:02AM1.34m | 10:43PM1.68m | 11:02AM1.19m | 11:57PM1.59m | 12:22PM1.09m | 1:22AM1.55m | 1:56PM1.08m | 2:39AM1.54m | |||||||
Low Tide | 1:55PM0.12m | 2:31AM0.11m | 2:38PM0.18m | 3:28AM0.21m | 3:25PM0.25m | 4:31AM0.33m | 4:18PM0.33m | 5:43AM0.45m | 5:20PM0.41m | 7:00AM0.52m | 6:30PM0.46m | 8:18AM0.53m | 7:46PM0.49m | ||||||||
 | |  |  | |  |  |  |  | | |  | | | | |  |  | | | | |
 | 5:13 | — | — | 5:11 | — | — | 5:11 | — | — | 5:09 | — | — | 5:07 | — | — | 5:05 | — | — | 5:05 | — | — |
 | — | — | 9:32 | — | — | 9:35 | — | — | 9:37 | — | — | 9:37 | — | — | 9:39 | — | — | 9:42 | — | — | 9:43 |
— | — | 9 | 4 | 2 | 1 | — | 1 | 1 | — | — | — | — | 1 | 9 | — | — | — | — | — | — | |
Temp °C | 11 | 12 | 10 | 12 | 13 | 11 | 14 | 15 | 15 | 17 | 19 | 16 | 19 | 20 | 13 | 16 | 15 | 13 | 17 | 18 | 17 |
8 | 8 | 2 | 9 | 10 | 7 | 10 | 11 | 12 | 14 | 17 | 12 | 17 | 18 | 12 | 14 | 13 | 12 | 16 | 17 | 17 | |
Swell 1 Height (m) Direction Period (s) | NW 11 | WNW 11 | WNW 10 | NW 10 | ESE 4 | NW 16 | WNW 14 | WNW 13 | WNW 12 | NW 8 | WNW 11 | W 11 | WNW 13 | WNW 13 | W 10 | WNW 9 | W 7 | WNW 10 | NW 6 | NW 5 | N 3 |
 kJ | 176 | 149 | 67 | 23 | 3 | 64 | 160 | 99 | 81 | 17 | 39 | 9 | 33 | 16 | 7 | 8 | 1 | 9 | 1 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | W 15 | WNW 9 | W 10 | — | WNW 7 | — | WNW 11 | — | WNW 6 | ESE 4 | — | — | W 12 | W 11 | — | W 9 | W 9 | W 5 |
| kJ | — | — | — | 4 | 8 | 8 | — | 10 | — | 12 | — | 3 | 1 | — | — | 3 | 2 | — | 2 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SE 6 | NW 9 | — | — | — | — | — | E 5 | E 5 | — | — | — | — | — | — | — | W 9 |
| kJ | — | — | — | — | 1 | 3 | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | — | — | ESE 4 | ESE 6 | S 3 | SSE 2 | SW 3 | — | — | SSE 3 | SSE 3 | SE 3 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 32 | 34 | 1 | 1 | 2 | — | — | 1 | 1 | 2 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 2 | 121 | 56 | 56 | 9 | 366 | 187 | 2 | 14 | 14 | 56 | 14 | 40 | 40 | 42 | 42 | 40 | 40 | 150 | 91 |
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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