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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Wednesday 13 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
10.8° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 12AM is: 2.5m 11s primary swell from a North-northwest direction (forecast issued at 06:00pm May 13). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 May) | 8ft (2.4m) | 10s |
| Afternoon (14 May) | 7.5ft (2.3m) | 9s |
| Evening (14 May) | 6.5ft (2.0m) | 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 4mm), mostly falling on Wed night. Mild temperatures (max 9°C on Wed afternoon, min 6°C on Fri night). Winds decreasing (strong winds from the NNW on Wed afternoon, light winds from the WNW by Fri night). | ||||||||||||||||||||||||
Wed 13 | Thursday 14 | Friday 15 | Sat 16 | |||||||||||||||||||||
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 | 10 AM | 1 PM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
NW 12 | NW 12 | NW 11 | NNW 11 | NNW 10 | NNW 10 | NNW 10 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NW 7 | NNW 7 | NW 7 | NW 7 | NW 7 | NW 8 | |
2055 | 1788 | 1713 | 1527 | 1319 | 1231 | 1037 | 866 | 749 | 612 | 502 | 422 | 302 | 231 | 154 | 105 | 60 | 27 | 26 | 25 | 14 | 14 | 14 | 19 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | cross-on | on | on | cross-on | cross-on | cross | cross-off | off | off | off | |
High Tide | 4:30PM1.39m | 4:45AM1.75m | 5:13PM1.54m | 5:28AM1.85m | 5:54PM1.68m | 6:11AM1.90m | ||||||||||||||||||
Low Tide | 10:29PM0.35m | 11:20AM0.20m | 11:15PM0.24m | 11:58AM0.12m | 00:02AM0.14m | 12:36PM0.08m | ||||||||||||||||||
 |  |  |  |  |  |  | | | | | | | | | | |  | | | | | | | |
 | — | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:18 | — | — | — | — | — | — | — | 5:16 | — | — | — |
 | — | 9:23 | — | — | — | — | — | — | — | 9:25 | — | — | — | — | — | — | — | 9:28 | — | — | — | — | — | 9:30 |
— | — | — | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | |
Temp °C | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 8 | 8 | 7 | 8 | 9 | 9 | 9 | 9 | 8 | 7 | 6 | 7 | 8 | 7 |
1 | 0 | 0 | 0 | 0 | 0 | -1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 2 | 2 | 3 | 4 | 4 | 4 | 2 | 3 | 4 | 3 | |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 8 | NW 8 | NW 8 | NW 7 | NNW 5 | NNW 7 | NNW 6 | NW 7 | NW 7 | NW 8 |
 kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 18 | 17 | 29 | 27 | 13 | 25 | 13 | 14 | 14 | 16 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 7 | NW 8 | NW 7 | NNW 6 | NNW 6 | NNW 5 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 26 | 14 | 14 | 7 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 10 | N 10 | NW 16 | NW 15 | WNW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 10 | 8 | 19 |
Wind waves Height (m) Direction Period (s) | NW 12 | NW 12 | NW 11 | NNW 11 | NNW 10 | NNW 10 | NNW 10 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | — | — | — | — | — | — |
| kJ | 2055 | 1788 | 1713 | 1527 | 1319 | 1231 | 1037 | 866 | 749 | 612 | 502 | 422 | 302 | 231 | 154 | 105 | 60 | 25 | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 1263 | 460 | 442 | 443 | 885 | 504 | 632 | 614 | 1081 | 342 | 286 | 336 | 303 | 72 | 300 | 342 | 303 | 266 | 27 | 27 | 42 | 16 | 40 | 40 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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