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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 5 pm Saturday 21 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
8.1° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 1AM is: 2.2m 14s primary swell from a Northwest direction (forecast issued at 05:00pm March 21). The wind direction is predicted to be offshore and the swell rating is 4.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 Mar) | 6.5ft (2.0m) | 14s |
| Afternoon (22 Mar) | 10ft (3.0m) | 14s |
| Evening (22 Mar) | 8ft (2.5m) | 14s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 21 | Sunday 22 | Monday 23 | Tuesday 24 | |||||||||||||||||||||
| 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) (?) | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 13 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2844 | 2772 | 2425 | 2061 | 1761 | 1438 | 1408 | 2063 | 3234 | 3056 | 2565 | 2345 | 2135 | 1975 | 1817 | 1750 | 1613 | 1299 | 976 | 865 | 932 | 940 | 1365 | 3487 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | off | off | cross- off | cross- off | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross |
High Tide / height (m) | 7:29PM 1.78 | 7:51AM 1.91 | 8:06PM 1.72 | 8:30AM 1.72 | 8:47PM 1.61 | 9:14AM 1.49 | ||||||||||||||||||
Low Tide / height (m) | 1:36PM 0.07 | 1:38AM 0.03 | 2:08PM 0.16 | 2:17AM 0.14 | 2:42PM 0.29 | 3:04AM 0.30 | ||||||||||||||||||
Saturday 21 | Sunday 22 | Monday 23 | Tuesday 24 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 6:24 | - | - | - | - | - | - | - | 6:22 | - | - | - | - | - | - | - | 6:20 | - |
| Sunset | - | 6:40 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - | - | 6:45 | - | - | - | - | - | - |
 | |  |  | | |  | | | | | | | | | | | | | |  |  | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 2 | - | - |
| Temp. °C | 12 | 12 | 9 | 8 | 8 | 8 | 7 | 9 | 8 | 8 | 7 | 6 | 5 | 5 | 5 | 8 | 9 | 10 | 10 | 12 | 11 | 10 | 8 | 8 |
| Feels °C (?) | 11 | 11 | 6 | 5 | 4 | 4 | 2 | 4 | 1 | 2 | 2 | 2 | 1 | 1 | 0 | 1 | 2 | 2 | 2 | 3 | 4 | 0 | -1 | -2 |
- 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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