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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 am Monday 27 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
9.8° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 9AM is: 0.1m 12s primary swell from a North direction and 0.1m 6s secondary swell from a North direction, 0.1m 4s secondary swell from a Northwest direction (forecast issued at 12:00am April 27). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (27 Apr) | 0.5ft (0.1m) | 12s |
| Afternoon (27 Apr) | 0.5ft (0.1m) | 11s |
| Evening (27 Apr) | 0.5ft (0.1m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Very mild (max 14°C on Tue afternoon, min 8°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | ||||||||||||||||||||||
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 | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
N 8 | N 9 | N 8 | N 12 | N 11 | N 11 | N 11 | N 10 | NNW 4 | W 16 | NW 15 | WNW 15 | WNW 14 | WNW 13 | NW 13 | WNW 13 | WNW 13 | WNW 13 | WNW 12 | NW 19 | NW 18 | NW 16 | NW 16 | NW 15 | |
5 | 6 | 6 | 3 | 2 | 2 | 2 | 2 | 1 | 5 | 9 | 21 | 20 | 35 | 44 | 66 | 67 | 95 | 60 | 91 | 249 | 390 | 553 | 666 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross | cross-on | on | on | cross-on | on | on | glassy | cross-off | cross-off | cross | cross | cross | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 4:18AM1.65m | 4:42PM1.31m | 5:00AM1.73m | 5:19PM1.43m | 5:34AM1.76m | 5:52PM1.54m | ||||||||||||||||||
Low Tide | 11:02AM0.36m | 10:42PM0.34m | 11:37AM0.28m | 11:24PM0.26m | 12:06PM0.22m | |||||||||||||||||||
 |  |  | | |  |  | | | | | | | | | | | | | | | | |  | |
 | — | 5:56 | — | — | — | — | — | — | — | 5:54 | — | — | — | — | — | — | — | 5:52 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 8:53 | — | — | — | — | — | — | — | 8:55 | — | — | — | — | — | — | — | 8:58 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 10 | 10 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 12 | 14 | 14 | 12 | 11 | 9 | 8 | 9 | 12 | 13 | 13 | 11 |
8 | 8 | 7 | 7 | 7 | 6 | 6 | 7 | 8 | 9 | 6 | 6 | 9 | 11 | 11 | 10 | 9 | 6 | 5 | 5 | 6 | 7 | 8 | 6 | |
Swell 1 Height (m) Direction Period (s) | N 8 | N 9 | N 8 | N 6 | N 6 | N 11 | — | NW 5 | NNW 4 | N 4 | N 4 | NNW 4 | WNW 14 | WNW 13 | NW 13 | WNW 13 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | NW 18 | NW 16 | NW 16 | NW 15 |
 kJ | 5 | 6 | 6 | 1 | 1 | 2 | — | 1 | 1 | 2 | 2 | 1 | 20 | 35 | 44 | 66 | 67 | 95 | 60 | 58 | 249 | 390 | 553 | 666 |
Swell 2 Height (m) Direction Period (s) | N 9 | — | — | N 12 | W 5 | — | N 6 | N 6 | NNE 3 | NW 5 | NW 4 | WNW 15 | NNW 4 | NW 4 | NW 5 | N 5 | N 9 | — | NW 20 | NW 19 | WNW 12 | WNW 12 | WNW 12 | — |
| kJ | 2 | — | — | 3 | 1 | — | 1 | 1 | 1 | 1 | 1 | 21 | 1 | 1 | 1 | 2 | 2 | — | 16 | 91 | 29 | 27 | 46 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | N 8 | N 11 | — | N 11 | N 10 | NW 5 | W 16 | NW 15 | N 10 | W 9 | N 10 | N 10 | N 10 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 1 | 2 | — | 2 | 2 | 1 | 5 | 9 | 2 | 2 | 2 | 2 | 2 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NW 4 | — | NW 2 | NNW 3 | NNW 3 | — | — | — | — | E 3 | E 3 | E 3 | — | — | — | — | — | E 3 | E 3 | ESE 3 | E 3 |
| kJ | — | — | — | 1 | — | 1 | 1 | 2 | — | — | — | — | 1 | 1 | 1 | — | — | — | — | — | 2 | 3 | 3 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 83 | 187 | 109 | 254 | 342 | 97 | 97 | 97 | 91 | 40 | 40 | 40 | 40 | 16 | 16 | 0 | 0 | 0 | 0 | 2 | 16 | 40 | 2 | 40 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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