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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Tuesday 28 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
9.9° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 2AM is: 0.4m 13s primary swell from a West-northwest direction and 0.1m 9s secondary swell from a North direction (forecast issued at 06:00pm April 28). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (29 Apr) | 1.5ft (0.4m) | 18s |
| Afternoon (29 Apr) | 3ft (0.9m) | 17s |
| Evening (29 Apr) | 4.5ft (1.3m) | 16s |
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 Thu night. Very mild (max 14°C on Thu afternoon, min 7°C on Tue night). Winds decreasing (fresh winds from the SE on Thu morning, calm by Fri morning). | ||||||||||||||||||||||||
Tue 28 | Wednesday 29 | Thursday 30 | Fri 1 | |||||||||||||||||||||
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 |  |    |    |    | ||||||||||||||||||||
WNW 13 | NW 13 | WNW 13 | WNW 13 | WNW 13 | WNW 13 | NW 18 | NW 17 | NW 16 | NW 16 | NW 16 | NW 15 | NW 15 | NW 14 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | |
35 | 44 | 65 | 65 | 66 | 63 | 119 | 309 | 521 | 803 | 783 | 838 | 695 | 676 | 581 | 565 | 404 | 386 | 325 | 325 | 315 | 281 | 232 | 228 | |
Wind (km/h) | ||||||||||||||||||||||||
cross | 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 | cross-off | cross-off | cross-off | cross-off | glassy | |
High Tide | 5:19PM1.43m | 5:34AM1.76m | 5:52PM1.54m | 6:06AM1.77m | 6:22PM1.63m | 6:36AM1.75m | ||||||||||||||||||
Low Tide | 11:24PM0.26m | 12:06PM0.22m | 00:01AM0.21m | 12:32PM0.19m | 00:36AM0.19m | 12:58PM0.18m | ||||||||||||||||||
 | |  | | | | | | | | | |  |  | | |  | |  |  | | | | | |
 | — | — | — | — | 5:52 | — | — | — | — | — | — | — | 5:48 | — | — | — | — | — | — | — | 5:47 | — | — | — |
 | — | 8:55 | — | — | — | — | — | — | — | 8:58 | — | — | — | — | — | — | — | 9:00 | — | — | — | — | — | 9:01 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | |
Temp °C | 13 | 12 | 11 | 10 | 8 | 7 | 9 | 12 | 13 | 13 | 12 | 9 | 8 | 7 | 10 | 12 | 14 | 14 | 11 | 11 | 10 | 10 | 11 | 14 |
10 | 9 | 9 | 8 | 5 | 4 | 6 | 7 | 7 | 9 | 9 | 5 | 3 | 1 | 3 | 4 | 8 | 10 | 8 | 9 | 7 | 8 | 9 | 13 | |
Swell 1 Height (m) Direction Period (s) | WNW 13 | NW 13 | WNW 13 | WNW 13 | WNW 13 | WNW 13 | NW 18 | NW 17 | NW 16 | NW 16 | NW 16 | NW 15 | NW 15 | NW 14 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 |
 kJ | 35 | 44 | 65 | 65 | 66 | 63 | 119 | 309 | 521 | 803 | 783 | 838 | 695 | 676 | 581 | 565 | 404 | 386 | 325 | 325 | 315 | 281 | 232 | 228 |
Swell 2 Height (m) Direction Period (s) | NNW 4 | NW 4 | N 5 | N 9 | N 9 | NW 20 | WNW 12 | WNW 12 | WNW 12 | — | — | — | — | — | — | — | — | ESE 5 | ESE 5 | ESE 5 | — | E 5 | E 5 | — |
| kJ | 1 | 1 | 2 | 2 | 2 | 16 | 50 | 57 | 56 | — | — | — | — | — | — | — | — | 19 | 9 | 5 | — | 2 | 2 | — |
Swell 3 Height (m) Direction Period (s) | N 10 | N 10 | N 10 | — | — | N 9 | N 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | 2 | 2 | — | — | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNW 12 | — | — | E 3 | E 4 | E 4 | E 4 | ESE 4 | ESE 5 | — | — | — | ESE 4 | — | — | ESE 5 |
| kJ | — | — | — | — | — | — | — | — | 46 | — | — | 5 | 6 | 6 | 14 | 35 | 44 | — | — | — | 2 | — | — | 2 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 40 | 14 | 0 | 0 | 0 | 0 | 0 | 16 | 2 | 0 | 0 | 2 | 4 | 40 | 66 | 91 | 56 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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