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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 am Saturday 25 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
9.3° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 3PM is: 0.1m 8s primary swell from a Northwest direction and 0.1m 6s secondary swell from a Northwest direction (forecast issued at 06:00am April 25). The wind direction is predicted to be glassy.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (25 Apr) | 0.5ft (0.1m) | 9s |
| Afternoon (25 Apr) | 0.5ft (0.1m) | 8s |
| Evening (25 Apr) | 0.5ft (0.1m) | 8s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Very mild (max 17°C on Sat afternoon, min 9°C on Sun night). Wind will be generally light. | ||||||||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tue 28 | |||||||||||||||||||||
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 | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
NW 6 | N 9 | N 8 | NW 8 | NW 8 | NW 8 | NW 7 | NW 7 | NW 7 | NW 7 | NW 7 | N 9 | N 8 | NNW 8 | N 9 | N 9 | N 9 | WNW 5 | N 12 | N 11 | NW 5 | NW 5 | NW 5 | NNW 5 | |
2 | 2 | 1 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 5 | 6 | 2 | 2 | 6 | 2 | 3 | 2 | 3 | 4 | 4 | 2 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | off | cross-off | glassy | glassy | glassy | cross-off | glassy | off | glassy | on | on | on | glassy | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross | |
High Tide | 1:59AM1.44m | 2:50PM1.07m | 3:24AM1.54m | 3:57PM1.18m | 4:18AM1.65m | 4:42PM1.31m | ||||||||||||||||||
Low Tide | 9:05AM0.55m | 8:37PM0.54m | 10:16AM0.45m | 9:49PM0.44m | 11:02AM0.36m | 10:42PM0.34m | ||||||||||||||||||
 |  | |  | |  | |  | | | |  | | | |  | | | | | | | | | |
 | 6:01 | — | — | — | — | — | — | — | 5:58 | — | — | — | — | — | — | — | 5:56 | — | — | — | — | — | — | 5:54 |
 | — | — | — | — | — | 8:50 | — | — | — | — | — | — | — | 8:52 | — | — | — | — | — | — | — | 8:53 | — | 8:55 |
— | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 11 | 10 | 12 | 15 | 16 | 17 | 14 | 12 | 11 | 11 | 12 | 12 | 12 | 12 | 11 | 10 | 9 | 9 | 11 | 13 | 12 | 11 | 10 | 10 |
8 | 6 | 8 | 12 | 14 | 16 | 13 | 10 | 9 | 9 | 11 | 10 | 10 | 10 | 10 | 8 | 6 | 6 | 9 | 9 | 8 | 8 | 8 | 8 | |
Swell 1 Height (m) Direction Period (s) | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | NW 8 | NW 7 | — | NW 7 | NW 7 | E 3 | E 3 | N 8 | NNW 8 | N 7 | N 8 | N 9 | N 8 | N 8 | N 6 | N 11 | N 11 | NW 5 | NNW 5 |
 kJ | 2 | 2 | 1 | 1 | 1 | 2 | 2 | — | 2 | 2 | 1 | 1 | 5 | 6 | 1 | 1 | 6 | 1 | 1 | 1 | 2 | 2 | 4 | 2 |
Swell 2 Height (m) Direction Period (s) | — | N 9 | N 8 | NW 8 | NW 8 | NW 6 | — | NW 7 | — | — | NW 7 | NW 7 | E 3 | — | N 9 | — | NW 4 | — | N 12 | N 11 | N 6 | N 8 | N 11 | W 5 |
| kJ | — | 2 | 1 | 3 | 3 | 1 | — | 2 | — | — | 2 | 2 | 1 | — | 2 | — | 1 | — | 3 | 2 | 1 | 1 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NW 6 | NW 6 | N 6 | — | — | N 9 | NW 6 | — | — | N 9 | — | — | — | N 9 | — | — | W 11 | N 10 |
| kJ | — | — | — | — | — | — | 1 | 1 | 1 | — | — | 1 | 2 | — | — | 2 | — | — | — | 1 | — | — | 2 | 2 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WNW 5 | WNW 5 | NW 2 | NW 5 | NW 5 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 1 | 3 | 4 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 91 | 91 | 145 | 145 | 145 | 150 | 150 | 150 | 266 | 266 | 266 | 266 | 266 | 270 | 87 | 56 | 56 | 56 | 83 | 87 | 144 | 144 | 87 | 109 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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