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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Sunday 10 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
10.5° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 12AM is: 1.2m 7s primary swell from a Northwest direction and 0.1m 10s secondary swell from a West direction (forecast issued at 06:00pm May 10). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 May) | 5ft (1.5m) | 8s |
| Afternoon (11 May) | 4.5ft (1.3m) | 8s |
| Evening (11 May) | 3.5ft (1.1m) | 9s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 5mm), mostly falling on Tue night. Very mild (max 11°C on Tue morning, min 6°C on Sun night). Winds increasing (light winds from the WSW on Mon night, strong winds from the WNW by Tue night). | ||||||||||||||||||||||||
Sun 10 | Monday 11 | Tuesday 12 | Wed 13 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
NNW 8 | NW 8 | NW 7 | NW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NW 9 | NW 9 | NW 9 | NW 9 | NW 7 | NW 8 | NW 9 | NW 9 | NW 10 | NW 10 | NW 10 | NW 11 | NW 11 | NW 12 | NW 12 | |
72 | 96 | 136 | 188 | 234 | 270 | 277 | 237 | 235 | 226 | 206 | 183 | 188 | 206 | 335 | 554 | 632 | 784 | 859 | 1112 | 1853 | 2728 | 3517 | 3342 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-off | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | |
High Tide | 1:04PM1.05m | 2:15AM1.36m | 2:42PM1.12m | 3:14AM1.48m | 3:43PM1.25m | 4:01AM1.62m | ||||||||||||||||||
Low Tide | 7:33PM0.60m | 9:07AM0.61m | 8:42PM0.54m | 9:58AM0.47m | 9:39PM0.46m | 10:41AM0.32m | ||||||||||||||||||
 |  |  | |  | | | | |  | | | | | | | | |  |  | |  | | | |
 | — | — | — | — | 5:26 | — | — | — | — | — | — | — | 5:24 | — | — | — | — | — | — | — | 5:22 | — | — | — |
 | — | 9:19 | — | — | — | — | — | — | — | 9:21 | — | — | — | — | — | — | — | 9:22 | — | — | — | — | — | 9:23 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 1 | 1 | |
Temp °C | 10 | 10 | 9 | 9 | 7 | 6 | 7 | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 10 | 11 | 11 | 10 | 9 | 8 | 7 | 8 | 9 | 9 |
4 | 4 | 3 | 3 | -1 | -2 | 0 | 1 | 2 | 3 | 4 | 4 | 3 | 2 | 2 | 3 | 3 | 2 | 1 | -1 | -3 | -1 | 1 | 2 | |
Swell 1 Height (m) Direction Period (s) | W 10 | W 10 | W 10 | W 10 | — | — | — | N 15 | — | NW 9 | NW 9 | NW 9 | NW 9 | — | — | — | — | NW 10 | NW 10 | — | — | — | — | — |
 kJ | 2 | 2 | 2 | 2 | — | — | — | 4 | — | 226 | 206 | 183 | 188 | — | — | — | — | 784 | 859 | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 8 | NW 8 | NW 7 | NW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | — | — | — | — | NW 7 | NW 8 | NW 9 | NW 9 | — | — | NW 10 | NW 11 | NW 11 | NW 12 | NW 12 |
| kJ | 72 | 96 | 136 | 188 | 234 | 270 | 277 | 237 | 235 | — | — | — | — | 206 | 335 | 554 | 632 | — | — | 1112 | 1853 | 2728 | 3517 | 3342 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 377 | 389 | 469 | 334 | 349 | 303 | 144 | 144 | 266 | 266 | 0 | 283 | 309 | 309 | 409 | 571 | 328 | 339 | 339 | 341 | 341 | 432 | 1263 | 1263 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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