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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 5 pm Wednesday 25 Mar 2026 GMTForecast 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
8.4° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 12AM is: 2.5m 13s primary swell from a Northwest direction (forecast issued at 05:00pm March 25). The wind direction is predicted to be cross-onshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (26 Mar) | 6.5ft (2.0m) | 13s |
| Afternoon (26 Mar) | 5ft (1.5m) | 12s |
| Evening (26 Mar) | 4ft (1.2m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | |||||||||||||||||||||
| 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 10 | 10 | 11 | 20 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 4368 | 3135 | 2331 | 2045 | 1876 | 1521 | 1266 | 899 | 614 | 420 | 338 | 292 | 316 | 355 | 403 | 7191 | 9627 | 8803 | 8509 | 9053 | 9496 | 11280 | 9462 | 8179 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross | cross- off | cross- off | cross- off | off | off | off | cross | cross | cross | cross | cross | cross | cross | cross- off | cross | cross | cross- on | cross- on | cross- on |
High Tide / height (m) | 10:53PM 1.33 | 11:52AM 1.07 | 1:09AM 1.31 | 2:17PM 1.09 | 2:51AM 1.46 | |||||||||||||||||||
Low Tide / height (m) | 4:23PM 0.59 | 5:59AM 0.64 | 6:13PM 0.68 | 8:24AM 0.61 | 8:17PM 0.61 | 9:46AM 0.46 | ||||||||||||||||||
Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:09 | - |
| Sunset | - | 6:49 | - | - | - | - | - | - | - | 6:51 | - | - | - | - | - | - | - | 6:52 | - | - | - | - | - | - |
 | |  |  |  | |  |  | | | | | | | | |  |  | | | |  | | | |
Rain (mm) | 1 | 1 | 1 | - | - | - | - | - | - | - | - | 1 | - | - | - | - | 1 | - | - | 1 | 1 | 2 | 1 | 1 |
| Temp. °C | 6 | 6 | 5 | 5 | 5 | 4 | 5 | 6 | 5 | 7 | 8 | 9 | 8 | 7 | 8 | 8 | 7 | 7 | 5 | 5 | 6 | 6 | 6 | 7 |
| Feels °C (?) | -6 | -3 | -1 | 0 | 1 | -1 | 0 | 1 | -1 | 2 | 4 | 4 | 4 | 3 | 3 | 0 | -2 | -1 | -2 | -4 | -4 | -4 | -4 | -3 |
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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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