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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 am Saturday 23 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
11.3° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 6AM is: 0.2m 6s primary swell from a West-northwest direction and 0.1m 10s secondary swell from a West direction (forecast issued at 12:00am May 23). The wind direction is predicted to be offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (23 May) | 0.5ft (0.2m) | 6s |
| Afternoon (23 May) | 0.5ft (0.2m) | 7s |
| Evening (23 May) | 1ft (0.3m) | 10s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastSome drizzle, heaviest during Fri night. Warm (max 21°C on Sun afternoon, min 10°C on Fri night). Wind will be generally light. | ||||||||||||||||||||||||
Saturday 23 | Sunday 24 | Monday 25 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
W 12 | W 12 | WNW 6 | WNW 6 | WNW 6 | WNW 8 | WNW 9 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 16 | NW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | |
10 | 3 | 4 | 4 | 4 | 6 | 17 | 19 | 20 | 36 | 35 | 33 | 19 | 19 | 18 | 162 | 214 | 250 | 225 | 219 | 212 | 190 | 187 | 187 | |
Wind (km/h) | ||||||||||||||||||||||||
off | off | off | off | cross-off | cross-off | glassy | off | off | off | off | off | off | cross-off | on | cross-off | off | off | off | cross-off | cross-on | cross-on | cross-on | on | |
High Tide | 11:57PM1.59m | 12:22PM1.09m | 1:22AM1.55m | 1:56PM1.08m | 2:39AM1.54m | 3:12PM1.16m | ||||||||||||||||||
Low Tide | 7:00AM0.52m | 6:30PM0.46m | 8:18AM0.53m | 7:46PM0.49m | 9:24AM0.50m | 8:58PM0.48m | ||||||||||||||||||
 |  |  |  | | | | | | | | |  | | |  | | | | | | | | | |
 | — | 5:05 | — | — | — | — | — | — | — | 5:05 | — | — | — | — | — | — | — | 5:03 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:42 | — | — | — | — | — | — | — | 9:43 | — | — | — | — | — | — | — | 9:45 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 13 | 11 | 10 | 13 | 16 | 18 | 17 | 15 | 14 | 13 | 12 | 14 | 19 | 21 | 18 | 17 | 16 | 15 | 15 | 16 | 18 | 17 | 15 | 13 |
11 | 8 | 7 | 10 | 12 | 15 | 16 | 12 | 11 | 10 | 9 | 11 | 17 | 18 | 17 | 16 | 14 | 13 | 13 | 14 | 16 | 15 | 12 | 11 | |
Swell 1 Height (m) Direction Period (s) | W 12 | W 12 | WNW 6 | WNW 6 | WNW 6 | WNW 8 | WNW 9 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 16 | NW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 |
 kJ | 10 | 3 | 4 | 4 | 4 | 6 | 17 | 19 | 20 | 36 | 35 | 33 | 19 | 19 | 18 | 162 | 214 | 250 | 225 | 219 | 212 | 190 | 187 | 187 |
Swell 2 Height (m) Direction Period (s) | N 6 | W 5 | W 10 | W 12 | W 11 | W 11 | — | — | — | — | — | — | — | W 18 | NW 16 | NW 16 | — | — | — | — | — | — | — | — |
| kJ | 1 | 1 | 2 | 3 | 2 | 2 | — | — | — | — | — | — | — | 6 | 10 | 63 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | N 6 | — | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | SE 4 | — | — | — | — | — | — | — | — |
| kJ | 1 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSE 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 42 | 42 | 56 | 84 | 42 | 42 | 42 | 40 | 40 | 14 | 14 | 14 | 42 | 42 | 27 | 0 | 0 | 0 | 0 | 0 | 71 | 71 | 42 | 25 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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