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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Monday 18 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 1AM is: 0.6m 10s primary swell from a West-northwest direction (forecast issued at 06:00pm May 18). An open ocean swell of 1.0m 4s 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) | 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 16mm), heaviest on Mon night. Very mild (max 17°C on Thu morning, min 9°C on Mon night). Winds decreasing (fresh winds from the SE on Mon night, light winds from the SSW by Wed night). | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 11 | NW 10 | NW 10 | WNW 10 | NW 10 | WNW 10 | NW 10 | NW 9 | WNW 9 | WNW 9 | WNW 16 | WNW 16 | WNW 15 | WNW 15 | WNW 14 | WNW 14 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | WNW 11 | NW 7 | |
149 | 112 | 104 | 67 | 48 | 38 | 24 | 23 | 8 | 8 | 25 | 98 | 135 | 167 | 118 | 107 | 99 | 66 | 50 | 48 | 28 | 27 | 25 | 19 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | |
High Tide | 8:01PM1.88m | 8:25AM1.67m | 8:49PM1.85m | 9:12AM1.51m | 9:42PM1.78m | 10:02AM1.34m | ||||||||||||||||||
Low Tide | 1:55PM0.12m | 2:31AM0.11m | 2:38PM0.18m | 3:28AM0.21m | 3:25PM0.25m | 4:31AM0.33m | ||||||||||||||||||
 | |  | | |  | | | | | | |  |  |  | | | | | | | | | | |
 | — | — | — | — | 5:11 | — | — | — | — | — | — | — | 5:11 | — | — | — | — | — | — | — | 5:09 | — | — | — |
 | — | 9:32 | — | — | — | — | — | — | — | 9:35 | — | — | — | — | — | — | — | 9:37 | — | — | — | — | — | 9:37 |
— | — | 1 | 4 | 2 | 1 | 1 | — | 1 | 1 | 2 | 1 | — | — | — | — | — | — | — | — | 2 | — | — | — | |
Temp °C | 12 | 11 | 9 | 10 | 10 | 11 | 12 | 13 | 14 | 13 | 11 | 10 | 10 | 11 | 12 | 14 | 13 | 14 | 13 | 12 | 11 | 14 | 15 | 17 |
7 | 6 | 3 | 3 | 4 | 7 | 8 | 10 | 11 | 10 | 9 | 7 | 5 | 7 | 7 | 10 | 10 | 12 | 11 | 9 | 7 | 11 | 12 | 15 | |
Swell 1 Height (m) Direction Period (s) | WNW 11 | NW 10 | NW 10 | WNW 10 | NW 10 | WNW 10 | NW 10 | ESE 4 | ESE 4 | WNW 9 | WNW 9 | WNW 16 | WNW 15 | WNW 15 | WNW 14 | WNW 14 | WNW 13 | WNW 6 | WNW 6 | NW 6 | NW 6 | NW 6 | NW 7 | NW 7 |
 kJ | 149 | 112 | 104 | 67 | 48 | 38 | 24 | 5 | 2 | 8 | 8 | 98 | 135 | 167 | 118 | 107 | 99 | 21 | 13 | 9 | 10 | 10 | 11 | 19 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 15 | W 15 | NW 9 | WNW 9 | ESE 4 | ESE 3 | E 3 | — | W 4 | WNW 7 | — | WNW 7 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | WNW 12 | WNW 11 | WNW 11 |
| kJ | — | — | — | — | — | 4 | 4 | 23 | 8 | 1 | 1 | 1 | — | 2 | 10 | — | 20 | 66 | 50 | 48 | 28 | 27 | 25 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | W 14 | NW 13 | NW 13 | WNW 16 | W 10 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 4 | 7 | 7 | 25 | 8 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SE 3 | ESE 4 | ESE 4 | ESE 6 | ESE 6 | ESE 5 | SSE 3 | S 3 | S 3 | SE 3 | — | — | SSW 2 | WSW 3 | W 8 | WNW 3 | — | — | — | — | — | — | — |
| kJ | — | 2 | 11 | 42 | 87 | 43 | 23 | 2 | 1 | 1 | 2 | — | — | 1 | 2 | 66 | 4 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 2 | 2 | 16 | 121 | 56 | 16 | 172 | 83 | 162 | 41 | 14 | 0 | 9 | 0 | 9 | 71 | 0 | 0 | 0 | 8 | 16 | 14 | 60 | 14 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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