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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 am Sunday 19 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)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 7AM is: 1.2m 9s primary swell from a Northwest direction (forecast issued at 12:00am April 19). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 Apr) | 3.5ft (1.1m) | 9s |
| Afternoon (19 Apr) | 3ft (0.9m) | 8s |
| Evening (19 Apr) | 2ft (0.6m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 19 | Monday 20 | Tuesday 21 | ||||||||||||||||||||||
| 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 9 | 9 | 8 | 8 | 15 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 14 | 14 | 13 | 13 | 16 | 15 | 14 | 14 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 335 | 300 | 237 | 226 | 166 | 138 | 120 | 144 | 134 | 207 | 200 | 228 | 147 | 168 | 94 | 208 | 125 | 87 | 109 | 159 | 227 | 251 | 224 | 173 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | cross- off | cross- off | cross | cross- on | on | on | on | on | on | glass | cross- on | cross- on | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- off | cross- off |
High Tide / height (m) | 7:33PM 1.84 | 7:53AM 1.94 | 8:12PM 1.84 | 8:34AM 1.79 | 8:54PM 1.79 | 9:18AM 1.60 | ||||||||||||||||||
Low Tide / height (m) | 1:45AM 0.01 | 2:11PM 0.07 | 2:29AM 0.07 | 2:47PM 0.17 | 3:18AM 0.19 | 3:28PM 0.30 | ||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:09 | - | - | - | - |
| Sunset | - | - | - | - | - | - | - | 8:37 | - | - | - | - | - | - | - | 8:39 | - | - | - | - | - | - | - | 8:42 |
 | |  |  |  |  | | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 8 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 8 | 7 | 7 | 7 | 8 | 10 | 11 | 10 | 8 | 7 | 6 | 5 | 7 | 9 | 11 | 12 |
| Feels °C (?) | 4 | 3 | 3 | 3 | 5 | 6 | 5 | 5 | 5 | 4 | 5 | 5 | 6 | 6 | 6 | 5 | 4 | 2 | 1 | 0 | 1 | 2 | 4 | 5 |
- 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.
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