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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 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
10.8° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 11PM is: 0.2m 16s primary swell from a West-northwest direction and 0.2m 9s secondary swell from a West-northwest direction (forecast issued at 06:00pm May 19). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 May) | - | - |
| Afternoon (19 May) | 1ft (0.3m) | 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 11mm), heaviest on Tue afternoon. Very mild (max 19°C on Thu afternoon, min 9°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Tue 19 | Wednesday 20 | Thursday 21 | Fri 22 | |||||||||||||||||||||
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 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 | NW 9 | NW 8 | NW 8 | WNW 11 | WNW 11 | WNW 11 | W 11 | W 11 | W 11 | W 12 | W 11 | |
8 | 8 | 25 | 64 | 186 | 167 | 160 | 107 | 68 | 56 | 50 | 28 | 28 | 62 | 43 | 41 | 22 | 23 | 11 | 9 | 9 | 9 | 10 | 9 | |
Wind (km/h) | ||||||||||||||||||||||||
off | cross-off | off | cross-off | off | off | cross-off | cross | cross | cross-off | off | cross-off | off | off | off | cross-off | cross-off | off | off | off | off | off | off | off | |
High Tide | 8:49PM1.85m | 9:12AM1.51m | 9:42PM1.78m | 10:02AM1.34m | 10:43PM1.68m | 11:02AM1.19m | ||||||||||||||||||
Low Tide | 2:38PM0.18m | 3:28AM0.21m | 3:25PM0.25m | 4:31AM0.33m | 4:18PM0.33m | 5:43AM0.45m | ||||||||||||||||||
 |  |  |  |  |  |  |  | | | | | | | | | | | | | | | | | |
 | — | — | — | — | 5:11 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — | — | 5:07 | — | — | — |
 | — | 9:35 | — | — | — | — | — | — | — | 9:37 | — | — | — | — | — | — | — | 9:37 | — | — | — | — | — | 9:39 |
1 | 3 | 2 | 1 | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 2 | 1 | — | — | — | — | — | |
Temp °C | 13 | 12 | 11 | 11 | 9 | 10 | 11 | 14 | 15 | 15 | 13 | 12 | 11 | 13 | 15 | 16 | 19 | 15 | 15 | 14 | 13 | 13 | 15 | 16 |
10 | 9 | 9 | 9 | 6 | 6 | 6 | 8 | 9 | 13 | 11 | 9 | 8 | 10 | 12 | 14 | 17 | 14 | 12 | 11 | 9 | 9 | 13 | 13 | |
Swell 1 Height (m) Direction Period (s) | ESE 4 | WNW 9 | WNW 9 | NW 16 | WNW 15 | WNW 15 | WNW 14 | WNW 14 | WNW 13 | WNW 6 | WNW 6 | WNW 6 | NW 7 | NW 9 | NW 8 | NW 8 | NW 7 | NW 7 | NW 7 | NW 7 | NW 7 | WNW 7 | ESE 4 | E 4 |
 kJ | 3 | 8 | 8 | 64 | 186 | 167 | 160 | 107 | 68 | 21 | 16 | 16 | 23 | 62 | 43 | 41 | 19 | 14 | 8 | 7 | 7 | 4 | 3 | 1 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | ESE 3 | WNW 16 | WNW 9 | — | — | — | — | — | WNW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 11 | W 11 | W 11 | W 12 | NW 6 |
| kJ | 8 | 1 | 25 | 8 | — | — | — | — | — | 56 | 50 | 28 | 28 | 27 | 24 | 12 | 22 | 23 | 11 | 9 | 9 | 9 | 10 | 2 |
Swell 3 Height (m) Direction Period (s) | NW 13 | NW 13 | ESE 3 | ESE 3 | — | — | — | — | — | — | — | — | WNW 7 | — | — | — | — | — | — | — | N 8 | — | WNW 6 | W 11 |
| kJ | 7 | 7 | 1 | 1 | — | — | — | — | — | — | — | — | 10 | — | — | — | — | — | — | — | 1 | — | 4 | 9 |
Wind waves Height (m) Direction Period (s) | — | — | — | SSE 4 | — | — | WSW 2 | W 6 | WNW 6 | — | — | — | — | — | — | SSE 3 | — | — | — | — | SE 2 | SE 3 | — | — |
| kJ | — | — | — | 1 | — | — | 1 | 26 | 30 | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 3 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 42 | 40 | 16 | 0 | 0 | 0 | 282 | 187 | 71 | 0 | 0 | 25 | 0 | 0 | 0 | 60 | 14 | 40 | 83 | 56 | 83 | 56 | 56 | 56 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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