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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 25 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
11.5° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 5AM is: 0.8m 14s primary swell from a West-northwest direction (forecast issued at 12:00am May 25). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (25 May) | 2.5ft (0.8m) | 13s |
| Afternoon (25 May) | 2.5ft (0.8m) | 13s |
| Evening (25 May) | 2.5ft (0.8m) | 12s |
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 18°C on Wed morning, min 10°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Monday 25 | Tuesday 26 | Wednesday 27 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
NW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | NW 12 | WNW 12 | WNW 11 | NW 11 | WNW 11 | WNW 10 | WNW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | NW 7 | NW 7 | NW 7 | |
211 | 250 | 225 | 222 | 219 | 209 | 190 | 184 | 187 | 190 | 209 | 174 | 157 | 119 | 101 | 71 | 75 | 55 | 54 | 20 | 20 | 13 | 12 | 12 | |
Wind (km/h) | ||||||||||||||||||||||||
off | cross-off | off | cross-off | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 2:39AM1.54m | 3:12PM1.16m | 3:37AM1.56m | 4:06PM1.27m | 4:23AM1.56m | 4:49PM1.38m | ||||||||||||||||||
Low Tide | 9:24AM0.50m | 8:58PM0.48m | 10:15AM0.44m | 10:01PM0.45m | 10:55AM0.39m | |||||||||||||||||||
 |  |  |  |  | | | | | | | | | | | | | | | | | | | | |
 | — | 5:03 | — | — | — | — | — | — | — | 5:01 | — | — | — | — | — | — | — | 5:01 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:45 | — | — | — | — | — | — | — | 9:45 | — | — | — | — | — | — | — | 9:47 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 17 | 16 | 15 | 16 | 16 | 16 | 13 | 13 | 12 | 12 | 12 | 12 | 14 | 14 | 13 | 11 | 10 | 10 | 12 | 14 | 18 | 18 | 17 | 16 |
16 | 13 | 13 | 15 | 14 | 14 | 11 | 12 | 11 | 10 | 10 | 9 | 10 | 9 | 9 | 8 | 7 | 8 | 10 | 12 | 16 | 15 | 14 | 14 | |
Swell 1 Height (m) Direction Period (s) | NW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | NW 12 | WNW 12 | WNW 11 | NW 11 | WNW 11 | WNW 10 | WNW 11 | NW 11 | NW 10 | NNW 7 | NNW 7 | NW 7 | NW 7 | NW 7 |
 kJ | 211 | 250 | 225 | 222 | 219 | 209 | 190 | 184 | 187 | 190 | 209 | 174 | 157 | 119 | 101 | 71 | 75 | 55 | 54 | 18 | 18 | 13 | 12 | 12 |
Swell 2 Height (m) Direction Period (s) | SE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 4 | N 4 | NNE 4 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 |
| kJ | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 9 | 4 | 20 | 20 | 10 | 10 | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 4 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 3 | N 3 | — | — | — | — | E 3 | E 3 | E 3 | ESE 3 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | — | — | — | 1 | 3 | 5 | 4 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 42 | 71 | 71 | 40 | 25 | 40 | 40 | 40 | 40 | 71 | 71 | 41 | 40 | 0 | 0 | 14 | 40 | 40 | 40 | 40 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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