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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
16 Day Weather and Surf, issued 6 am Friday 17 Apr 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
8.8° 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 Sunday (Apr 19) at 1AM. The primary swell is predicted to be 1.4m and 9s period. 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 1.8m 10s and forecast to arrive on Saturday (Apr 18) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (Apr 23) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 19th Apr) | 4.5ft (1.4m) 9s |
| Best Surf | 1AM (Sun 19th Apr) | 4.5ft (1.4m) 9s |
| Most Powerful | 4PM (Sat 18th Apr) | 6ft (1.8m) 10s |
Table - best surf conditions forecast for Castlerock over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Light rain (total 4mm), mostly falling on Fri morning. Very mild (max 12°C on Fri afternoon, min 7°C on Sat night). Winds decreasing (fresh winds from the SSW on Fri morning, calm by Sun night). | Days 3-6 Weather Summary Mostly dry. Very mild (max 12°C on Tue afternoon, min 6°C on Mon night). Winds increasing (light winds from the E on Mon morning, fresh winds from the E by Tue morning). | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 12 | 12 | 9 | 9 | 10 | 9 | 8 | 8 | 12 | 11 | 11 | 13 | 15 | 14 | 13 | 12 | 11 | 4 | 4 | 3 | 8 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 27 | 46 | 47 | 338 | 573 | 294 | 135 | 132 | 146 | 177 | 72 | 144 | 134 | 218 | 134 | 66 | 30 | 12 | 5 | 3 | 1 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | cross- off | cross- on | cross- on | cross- off | cross- off | on | glass | cross | cross | cross | cross | cross- off | cross | cross | cross | cross- off | cross- off | cross | glass |
High Tide / height (m) | 6:56PM 1.79 | 7:14AM 2.02 | 7:33PM 1.84 | 7:53AM 1.94 | 8:12PM 1.84 | 8:34AM 1.79 | 8:54PM 1.79 | 9:18AM 1.60 | 9:41PM 1.68 | 10:06AM 1.38 | 10:40PM 1.55 | 11:09AM 1.17 | 12:04AM 1.44 | ||||||||
Low Tide / height (m) | 1:05PM 0.01 | 1:05AM 0.01 | 1:37PM 0.02 | 1:45AM 0.01 | 2:11PM 0.07 | 2:29AM 0.07 | 2:47PM 0.17 | 3:18AM 0.19 | 3:28PM 0.30 | 4:17AM 0.35 | 4:17PM 0.43 | 5:36AM 0.50 | 5:26PM 0.54 | ||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
| Sunrise | 6:20 | - | - | 6:16 | - | - | 6:15 | - | - | 6:11 | - | - | 6:09 | - | - | 6:07 | - | - | 6:05 | - | - |
| Sunset | - | 8:34 | - | - | 8:36 | - | - | 8:37 | - | - | 8:39 | - | - | 8:42 | - | - | 8:44 | - | - | 8:45 | - |
 | |  | |  | |  | |  | | | | | | | | | | | | | |
Rain (mm) | 1 | 2 | - | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 11 | 12 | 9 | 9 | 9 | 8 | 9 | 9 | 8 | 10 | 9 | 8 | 10 | 12 | 9 | 9 | 11 | 8 | 11 | 12 | 11 |
| Feels °C (?) | 5 | 5 | 4 | 2 | 2 | 4 | 6 | 5 | 6 | 5 | 4 | 4 | 2 | 6 | 5 | 3 | 6 | 3 | 7 | 7 | 8 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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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