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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 am Tuesday 19 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
10.7° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 6AM is: 0.5m 10s primary swell from a Northwest direction and 0.1m 15s secondary swell from a West direction (forecast issued at 12:00am May 19). An open ocean swell of 1.0m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 May) | 1.5ft (0.4m) | 10s |
| Afternoon (19 May) | 0.5ft (0.2m) | 9s |
| Evening (19 May) | 0.5ft (0.2m) | 16s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 16mm), heaviest on Mon night. Very mild (max 18°C on Thu afternoon, min 9°C on Mon night). Winds decreasing (fresh winds from the SE on Mon night, light winds from the S by Wed night). | ||||||||||||||||||||||||
Tuesday 19 | Wednesday 20 | Thursday 21 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
WNW 10 | NW 10 | WNW 10 | NW 10 | NW 9 | WNW 9 | WNW 9 | WNW 16 | NW 16 | WNW 15 | WNW 15 | WNW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | WNW 11 | NW 8 | WNW 11 | WNW 11 | NW 7 | |
67 | 48 | 38 | 24 | 23 | 8 | 8 | 25 | 64 | 135 | 167 | 160 | 105 | 99 | 66 | 50 | 48 | 28 | 27 | 25 | 28 | 22 | 22 | 13 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | off | cross-off | cross-off | off | off | off | cross-off | off | off | |
High Tide | 8:25AM1.67m | 8:49PM1.85m | 9:12AM1.51m | 9:42PM1.78m | 10:02AM1.34m | |||||||||||||||||||
Low Tide | 2:31AM0.11m | 2:38PM0.18m | 3:28AM0.21m | 3:25PM0.25m | 4:31AM0.33m | 4:18PM0.33m | ||||||||||||||||||
 | |  |  | | | | |  |  |  |  | | | | |  | | | | | | | | |
 | — | 5:11 | — | — | — | — | — | — | — | 5:11 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:35 | — | — | — | — | — | — | — | 9:37 | — | — | — | — | — | — | — | 9:37 | — |
2 | 1 | 1 | — | 1 | 1 | 2 | 1 | 1 | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | 2 | 2 | |
Temp °C | 10 | 10 | 11 | 12 | 12 | 14 | 12 | 11 | 11 | 11 | 11 | 12 | 15 | 15 | 15 | 13 | 12 | 12 | 14 | 15 | 16 | 18 | 17 | 16 |
2 | 3 | 7 | 8 | 8 | 11 | 9 | 9 | 7 | 6 | 7 | 8 | 11 | 11 | 12 | 11 | 9 | 8 | 11 | 13 | 13 | 17 | 16 | 14 | |
Swell 1 Height (m) Direction Period (s) | WNW 10 | NW 10 | WNW 10 | NW 10 | NW 9 | ESE 4 | ESE 3 | WNW 9 | NW 16 | WNW 15 | WNW 15 | WNW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 7 | WNW 7 | WNW 6 | NW 6 | NW 7 | NW 8 | NW 8 | NW 7 | NW 7 |
 kJ | 67 | 48 | 38 | 24 | 23 | 2 | 1 | 8 | 64 | 135 | 167 | 160 | 105 | 99 | 66 | 17 | 17 | 16 | 15 | 19 | 28 | 20 | 19 | 13 |
Swell 2 Height (m) Direction Period (s) | — | — | W 15 | W 15 | W 14 | WNW 9 | WNW 9 | ESE 3 | W 10 | — | — | — | — | — | WNW 6 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 |
| kJ | — | — | 4 | 4 | 4 | 8 | 8 | 1 | 8 | — | — | — | — | — | 18 | 50 | 48 | 28 | 27 | 25 | 23 | 22 | 22 | 11 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SE 6 | NW 13 | WNW 16 | E 3 | — | — | — | — | — | — | — | — | — | — | — | ESE 3 | SE 4 | — | SE 5 |
| kJ | — | — | — | — | — | 1 | 7 | 25 | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 1 |
Wind waves Height (m) Direction Period (s) | ESE 5 | ESE 6 | ESE 6 | ESE 5 | SE 4 | S 3 | S 3 | — | — | — | S 2 | WSW 3 | W 3 | WNW 5 | — | — | — | — | — | — | SSE 3 | SSE 3 | SSE 2 | — |
| kJ | 54 | 90 | 43 | 24 | 7 | 1 | 1 | — | — | — | 1 | 3 | 4 | 17 | — | — | — | — | — | — | 1 | 1 | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 121 | 79 | 16 | 172 | 56 | 66 | 41 | 42 | 9 | 9 | 8 | 9 | 9 | 71 | 9 | 0 | 0 | 56 | 14 | 14 | 8 | 14 | 16 | 56 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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