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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 22 Apr 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
9.3° 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: 0.7m 4s primary swell from a East direction and 0.1m 10s secondary swell from a Northwest direction (forecast issued at 06:00pm April 22). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (23 Apr) | 0.5ft (0.1m) | 9s |
| Afternoon (23 Apr) | 0.5ft (0.1m) | 9s |
| Evening (23 Apr) | 0.5ft (0.1m) | 9s |
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 15°C on Fri afternoon, min 5°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||||
Wed 22 | Thursday 23 | Friday 24 | Sat 25 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
E 5 | E 4 | E 4 | NW 10 | NW 10 | NW 9 | W 9 | W 9 | W 9 | W 9 | ESE 3 | W 8 | W 9 | W 9 | ESE 2 | ESE 2 | N 7 | N 7 | N 7 | NW 6 | W 14 | N 9 | N 8 | NW 8 | |
34 | 17 | 10 | 4 | 4 | 3 | 2 | 2 | 2 | 2 | 0 | 1 | 2 | 2 | 0 | 0 | 1 | 1 | 1 | 2 | 4 | 2 | 1 | 3 | |
Wind (km/h) | ||||||||||||||||||||||||
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 | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | |
High Tide | 10:40PM1.55m | 11:09AM1.17m | 00:04AM1.44m | 12:52PM1.04m | 1:59AM1.44m | |||||||||||||||||||
Low Tide | 4:17PM0.43m | 5:36AM0.50m | 5:26PM0.54m | 7:21AM0.59m | 7:01PM0.59m | 9:05AM0.55m | ||||||||||||||||||
 | |  |  | |  | | |  | |  | | | | | | | | | | | | | | |
 | — | — | — | — | 6:05 | — | — | — | — | — | — | — | 6:03 | — | — | — | — | — | — | — | 6:01 | — | — | — |
 | — | 8:44 | — | — | — | — | — | — | — | 8:45 | — | — | — | — | — | — | — | 8:47 | — | — | — | — | — | 8:50 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 12 | 11 | 10 | 7 | 6 | 5 | 7 | 11 | 12 | 11 | 11 | 11 | 11 | 9 | 10 | 14 | 15 | 14 | 12 | 11 | 10 | 10 | 11 | 14 |
6 | 4 | 3 | 1 | 0 | 0 | 1 | 6 | 7 | 7 | 8 | 8 | 8 | 6 | 6 | 10 | 11 | 11 | 8 | 7 | 6 | 6 | 8 | 12 | |
Swell 1 Height (m) Direction Period (s) | NW 11 | WNW 11 | WNW 10 | NW 10 | NW 10 | NW 9 | W 9 | W 9 | W 9 | W 9 | — | W 8 | W 9 | W 9 | — | — | N 7 | N 7 | N 7 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 |
 kJ | 18 | 11 | 10 | 4 | 4 | 3 | 2 | 2 | 2 | 2 | — | 1 | 2 | 2 | — | — | 1 | 1 | 1 | 2 | 2 | 2 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | N 6 | N 6 | — | — | NE 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 9 | N 8 | NW 8 |
| kJ | 1 | 1 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 14 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — |
Wind waves Height (m) Direction Period (s) | E 5 | E 4 | E 4 | E 4 | E 4 | E 4 | E 4 | E 4 | ESE 4 | ESE 4 | ESE 3 | ESE 3 | — | — | ESE 2 | ESE 2 | ESE 3 | ESE 3 | — | — | — | — | — | — |
| kJ | 34 | 17 | 10 | 16 | 16 | 10 | 10 | 9 | 10 | 7 | 2 | 1 | — | — | 1 | 1 | 1 | 1 | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 334 | 334 | 415 | 398 | 398 | 398 | 794 | 759 | 298 | 260 | 253 | 253 | 253 | 253 | 91 | 145 | 145 | 145 | 144 | 144 | 91 | 91 | 145 | 145 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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