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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 am Monday 23 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
8.3° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 4PM is: 2.0m 13s primary swell from a Northwest direction (forecast issued at 11:00am March 23). An open ocean swell of 0.5m 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 (23 Mar) | 8ft (2.4m) | 13s |
| Afternoon (23 Mar) | 7ft (2.1m) | 13s |
| Evening (23 Mar) | 6ft (1.8m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 23 | Tuesday 24 | Wednesday 25 | Thursday 26 | |||||||||||||||||||||
| 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 | 3 AM | 6 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 16 | 16 | 16 | 14 | 14 | 13 | 13 | 12 | 12 | 12 | 11 | 13 | 13 | 14 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1789 | 1634 | 1496 | 1280 | 1037 | 990 | 1266 | 2412 | 5058 | 5021 | 3769 | 2747 | 2191 | 2094 | 3159 | 2525 | 3650 | 3145 | 2742 | 2736 | 2681 | 2565 | 1380 | 2323 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on |
High Tide / height (m) | 8:30AM 1.72 | 8:47PM 1.61 | 9:14AM 1.49 | 9:37PM 1.47 | 10:10AM 1.26 | 10:53PM 1.33 | ||||||||||||||||||
Low Tide / height (m) | 2:42PM 0.29 | 3:04AM 0.30 | 3:23PM 0.44 | 4:08AM 0.49 | 4:23PM 0.59 | 5:59AM 0.64 | ||||||||||||||||||
Monday 23 | Tuesday 24 | Wednesday 25 | Thursday 26 | |||||||||||||||||||||
| Sunrise | 6:22 | - | - | - | - | - | - | - | 6:20 | - | - | - | - | - | - | - | 6:18 | - | - | - | - | - | - | - |
| Sunset | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:46 | - | - | - | - | - | - | - | 6:49 | - | - | - | - |
 | | | |  | |  | | | |  | |  | | | | |  | | |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | 2 | 2 | 3 | 1 | 3 | 1 | 2 | 1 | 1 | 1 | - | - | - | - |
| Temp. °C | 6 | 9 | 10 | 11 | 12 | 11 | 10 | 8 | 9 | 9 | 7 | 6 | 5 | 6 | 4 | 5 | 5 | 6 | 6 | 6 | 6 | 5 | 5 | 5 |
| Feels °C (?) | 1 | 3 | 2 | 4 | 5 | 3 | 2 | 2 | 4 | 3 | 1 | 0 | -2 | -1 | -6 | -6 | -6 | -5 | -5 | -3 | -2 | -1 | -1 | -1 |
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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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