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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 pm Saturday 18 Apr 2026 BSTForecast 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
8.8° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 3PM is: 1.5m 10s primary swell from a Northwest direction (forecast issued at 12:00pm April 18). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Apr) | 4.5ft (1.4m) | 9s |
| Afternoon (18 Apr) | 5ft (1.5m) | 10s |
| Evening (18 Apr) | 5ft (1.5m) | 9s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||||||||
| 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 15 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 15 | 14 | 14 | 13 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 338 | 357 | 446 | 479 | 335 | 300 | 260 | 231 | 166 | 138 | 120 | 144 | 134 | 146 | 200 | 228 | 174 | 94 | 71 | 217 | 160 | 147 | 140 | 299 |
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 | cross- off | on | on | on | cross- on | glass | glass | cross- off | cross- off | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 7:14AM 2.02 | 7:33PM 1.84 | 7:53AM 1.94 | 8:12PM 1.84 | 8:34AM 1.79 | 8:54PM 1.79 | ||||||||||||||||||
Low Tide / height (m) | 1:37PM 0.02 | 1:45AM 0.01 | 2:11PM 0.07 | 2:29AM 0.07 | 2:47PM 0.17 | 3:18AM 0.19 | ||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:09 |
| Sunset | - | - | - | 8:36 | - | - | - | - | - | - | - | 8:37 | - | - | - | - | - | - | - | 8:39 | - | - | - | - |
 |  | | |  | |  |  | | | | | | | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 9 | 9 | 9 | 8 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 8 | 7 | 7 | 7 | 8 | 11 | 11 | 10 | 8 | 7 | 6 | 6 |
| Feels °C (?) | 2 | 2 | 3 | 4 | 4 | 3 | 3 | 4 | 5 | 6 | 5 | 6 | 6 | 5 | 5 | 4 | 5 | 6 | 5 | 5 | 4 | 2 | 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)
FREE! Surf-Forecast.com widget for your website
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