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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 pm Friday 20 Feb 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
7.9° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 2AM is: 1.3m 12s primary swell from a West-northwest direction and 0.8m 18s secondary swell from a Northwest direction (forecast issued at 11:00pm February 20). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Feb) | 4ft (1.2m) | 17s |
| Afternoon (21 Feb) | 4.5ft (1.4m) | 17s |
| Evening (21 Feb) | 3ft (0.9m) | 16s |
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 | ||||||||||||||||||||||
| 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 | 3 PM | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 12 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 15 | 14 | 14 | 14 | 14 | 14 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 320 | 332 | 496 | 614 | 885 | 789 | 1048 | 545 | 441 | 604 | 449 | 437 | 557 | 586 | 721 | 961 | 1305 | 1765 | 2503 | 3808 | 4645 | 3427 | 2450 | 1542 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- off | off |
High Tide / height (m) | 7:49PM 1.68 | 8:14AM 1.94 | 8:25PM 1.62 | 8:51AM 1.80 | 9:04PM 1.53 | 9:32AM 1.61 | ||||||||||||||||||
Low Tide / height (m) | 1:56AM 0.04 | 2:36PM 0.20 | 2:30AM 0.14 | 3:10PM 0.30 | 3:09AM 0.27 | 3:49PM 0.43 | ||||||||||||||||||
Saturday 21 | Sunday 22 | Monday 23 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 7:37 | - | - | - | - | - | - | - | 7:35 | - | - | - | - | - | - | - | 7:31 | - | - | - |
| Sunset | - | - | - | - | - | - | 5:44 | - | - | - | - | - | - | - | 5:45 | - | - | - | - | - | - | - | 5:47 | - |
 | | |  |  | |  | |  |  | | |  | | | | | | | | | | | | |
Rain (mm) | - | - | - | 1 | - | - | 2 | - | 1 | - | - | 1 | - | - | 1 | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 12 | 11 | 9 | 9 | 9 | 8 | 9 | 9 | 8 | 8 | 8 | 8 | 9 | 9 | 10 | 10 | 8 |
| Feels °C (?) | 1 | 3 | 5 | 5 | 5 | 6 | 6 | 8 | 7 | 5 | 4 | 3 | 2 | 2 | 3 | 0 | -1 | -2 | -2 | -1 | 0 | 3 | 6 | 4 |
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Live Wave Height (m)
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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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