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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 am Tuesday 21 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
9.1° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 4AM is: 0.6m 13s primary swell from a West-northwest direction and 0.4m 6s secondary swell from a Northwest direction, 0.6m 4s secondary swell from a East direction (forecast issued at 12:00am April 21). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Apr) | 2ft (0.6m) | 15s |
| Afternoon (21 Apr) | 2.5ft (0.8m) | 14s |
| Evening (21 Apr) | 2ft (0.6m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||||||||||
| 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) (?) | 14 | 13 | 13 | 16 | 15 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 5 | 5 | 5 | 11 | 10 | 4 | 4 | 9 | 3 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 127 | 120 | 109 | 89 | 224 | 251 | 224 | 176 | 138 | 103 | 72 | 50 | 53 | 60 | 44 | 11 | 10 | 5 | 4 | 3 | 3 | 2 | 2 | 2 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | cross- off | cross | cross- off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 8:54PM 1.79 | 9:18AM 1.60 | 9:41PM 1.68 | 10:06AM 1.38 | 10:40PM 1.55 | 11:09AM 1.17 | ||||||||||||||||||
Low Tide / height (m) | 3:18AM 0.19 | 3:28PM 0.30 | 4:17AM 0.35 | 4:17PM 0.43 | 5:36AM 0.50 | 5:26PM 0.54 | ||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:09 | - | - | - | - | - | - | - | 6:07 | - | - | - | - | - | - | - | 6:05 | - | - | - | - |
| Sunset | - | - | - | - | - | - | - | 8:42 | - | - | - | - | - | - | - | 8:44 | - | - | - | - | - | - | - | 8:45 |
 | |  |  |  | | | | | |  | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 7 | 6 | 6 | 6 | 9 | 11 | 11 | 9 | 7 | 6 | 5 | 7 | 9 | 11 | 11 | 10 | 8 | 6 | 5 | 7 | 11 | 12 | 11 |
| Feels °C (?) | 5 | 2 | 0 | 0 | 0 | 3 | 5 | 6 | 3 | 0 | -1 | -2 | 0 | 2 | 5 | 6 | 5 | 3 | 2 | 1 | 2 | 6 | 7 | 7 |
- Map Icons:
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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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