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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 5 am Friday 27 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 11AM is: 3.5m 20s primary swell from a Northwest direction and 0.4m 23s secondary swell from a Northwest direction (forecast issued at 05:00am March 27). The wind direction is predicted to be cross-shore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (27 Mar) | 6ft (1.9m) | 14s |
| Afternoon (27 Mar) | 13ft (4.0m) | 19s |
| Evening (27 Mar) | 15ft (4.5m) | 17s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 27 | Saturday 28 | Sunday 29 | Mon 30 | |||||||||||||||||||||
| 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 | 9 PM | 0 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 11 | 14 | 20 | 19 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 12 | 11 | 12 | 14 | 15 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 355 | 453 | 1304 | 8439 | 11410 | 10345 | 10733 | 11450 | 13680 | 11389 | 9787 | 7762 | 6583 | 5230 | 3638 | 2695 | 1676 | 1111 | 981 | 1193 | 3020 | 6518 | 9014 | 9402 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross | cross- off | cross | cross | cross | cross | cross | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross | cross |
High Tide / height (m) | 1:09AM 1.31 | 2:17PM 1.09 | 2:51AM 1.46 | 3:27PM 1.21 | 3:47AM 1.64 | 4:10PM 1.35 | ||||||||||||||||||
Low Tide / height (m) | 8:24AM 0.61 | 8:17PM 0.61 | 9:46AM 0.46 | 9:29PM 0.45 | 10:33AM 0.32 | 10:16PM 0.29 | ||||||||||||||||||
Friday 27 | Saturday 28 | Sunday 29 | Mon 30 | |||||||||||||||||||||
| Sunrise | - | - | 6:11 | - | - | - | - | - | - | - | 6:09 | - | - | - | - | - | - | - | 6:07 | - | - | - | - | - |
| Sunset | - | - | - | - | - | 6:52 | - | - | - | - | - | - | - | 6:54 | - | - | - | - | - | - | - | 6:57 | - | - |
 |  |  |  | | | |  | | | | | | |  | | | |  | | | | | | |
Rain (mm) | 1 | - | - | 1 | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 1 | - | - | - | - | - | 3 | 3 | - | - | - | - |
| Temp. °C | 8 | 7 | 8 | 7 | 7 | 6 | 5 | 5 | 5 | 5 | 6 | 6 | 7 | 7 | 6 | 6 | 6 | 7 | 8 | 10 | 9 | 8 | 7 | 7 |
| Feels °C (?) | 3 | 2 | 2 | -1 | -3 | -4 | -5 | -5 | -5 | -5 | -4 | -5 | -3 | 0 | 1 | 1 | -1 | -1 | -1 | 2 | 0 | -2 | -3 | -2 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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