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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 am Wednesday 27 May 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
11.8° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 2PM is: 0.4m 7s primary swell from a North-northwest direction and 0.2m 10s secondary swell from a West-northwest direction, 0.4m 3s secondary swell from a East direction (forecast issued at 06:00am May 27). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (27 May) | 1.5ft (0.5m) | 7s |
| Afternoon (27 May) | 1.5ft (0.4m) | 7s |
| Evening (27 May) | 1.5ft (0.4m) | 7s |
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 19°C on Thu afternoon, min 12°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||||
Wednesday 27 | Thursday 28 | Friday 29 | Sat 30 | |||||||||||||||||||||
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 11 | WNW 11 | NNW 7 | WNW 10 | NNW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NW 6 | NNW 6 | NNW 6 | NW 9 | NW 8 | NW 8 | NW 11 | NW 10 | NW 10 | NW 9 | W 9 | WNW 8 | WNW 8 | WNW 8 | NW 8 | |
55 | 22 | 26 | 21 | 19 | 12 | 12 | 11 | 11 | 6 | 4 | 4 | 3 | 3 | 3 | 5 | 4 | 15 | 22 | 76 | 41 | 47 | 88 | 69 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | off | cross-off | cross-off | cross-off | cross | cross-off | off | |
High Tide | 4:23AM1.56m | 4:49PM1.38m | 5:02AM1.56m | 5:25PM1.48m | 5:37AM1.56m | 5:59PM1.56m | ||||||||||||||||||
Low Tide | 10:55AM0.39m | 10:53PM0.41m | 11:28AM0.34m | 11:38PM0.37m | 12:00PM0.30m | 00:18AM0.33m | ||||||||||||||||||
 |  | | |  | | | |  | | | | | |  | | |  | | | | | | | |
 | 5:01 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — | 4:56 |
 | — | — | — | — | — | 9:47 | — | — | — | — | — | — | — | 9:49 | — | — | — | — | — | — | — | 9:51 | — | 9:52 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 10 | 11 | 13 | 17 | 18 | 17 | 16 | 15 | 13 | 12 | 14 | 17 | 19 | 19 | 17 | 15 | 13 | 14 | 14 | 16 | 18 | 17 | 15 | 13 |
9 | 9 | 11 | 15 | 15 | 14 | 14 | 12 | 9 | 8 | 10 | 13 | 16 | 17 | 15 | 13 | 8 | 10 | 10 | 12 | 12 | 14 | 13 | 11 | |
Swell 1 Height (m) Direction Period (s) | NW 11 | N 5 | NNW 7 | NNW 7 | NNW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NW 6 | NNW 6 | NNW 6 | NW 6 | NW 6 | ESE 5 | ESE 5 | E 4 | NW 10 | NW 9 | — | WNW 8 | WNW 8 | WNW 8 | NW 8 |
 kJ | 55 | 11 | 26 | 21 | 19 | 12 | 12 | 11 | 11 | 6 | 4 | 4 | 1 | 1 | 9 | 4 | 1 | 15 | 22 | — | 41 | 47 | 88 | 69 |
Swell 2 Height (m) Direction Period (s) | NNW 5 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 10 | WNW 7 | — | W 13 | W 13 | — | — | — |
| kJ | 9 | 22 | 20 | 20 | 10 | 10 | 9 | 9 | 9 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 5 | — | 4 | 3 | — | — | — |
Swell 3 Height (m) Direction Period (s) | NNE 4 | NW 6 | — | — | — | — | — | — | — | — | — | — | — | — | NW 6 | NW 11 | NW 8 | W 16 | W 15 | — | — | — | — | — |
| kJ | 3 | 10 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 5 | 2 | 5 | 5 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | E 3 | E 3 | ESE 3 | ESE 3 | ESE 2 | ESE 3 | E 3 | ESE 4 | ESE 4 | ESE 4 | ESE 5 | ESE 5 | — | — | SSE 2 | S 3 | W 9 | W 4 | W 4 | — | — |
| kJ | — | — | — | 1 | 3 | 3 | 2 | 1 | 2 | 6 | 10 | 17 | 23 | 15 | 10 | — | — | 1 | 1 | 76 | 12 | 9 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 14 | 16 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 290 | 354 | 559 | 707 | 266 | 87 | 172 | 42 | 366 | 384 | 528 | 187 | 0 | 0 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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