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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 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
10.8° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 12PM is: 0.4m 10s primary swell from a Northwest direction (forecast issued at 06:00am May 19). An open ocean swell of 0.4m 4s is not directed at the surf break. The wind direction is predicted to be 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 12mm), heaviest on Tue afternoon. Very mild (max 19°C on Thu afternoon, min 10°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Tuesday 19 | Wednesday 20 | Thursday 21 | Fri 22 | |||||||||||||||||||||
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 | 1 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
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 | NW 9 | NW 8 | NW 8 | WNW 11 | NW 7 | NW 7 | W 11 | |
48 | 38 | 24 | 23 | 8 | 8 | 25 | 64 | 135 | 167 | 160 | 107 | 99 | 66 | 50 | 48 | 28 | 37 | 42 | 39 | 23 | 19 | 12 | 9 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | off | cross-off | cross-off | off | off | off | off | off | off | off | |
High Tide | 8:25AM1.67m | 8:49PM1.85m | 9:12AM1.51m | 9:42PM1.78m | 10:02AM1.34m | 10:43PM1.68m | ||||||||||||||||||
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 | — | — | — | — | — | — | 5:07 |
 | — | — | — | — | — | 9:35 | — | — | — | — | — | — | — | 9:37 | — | — | — | — | — | — | — | 9:37 | — | 9:39 |
1 | — | 1 | 1 | 1 | 2 | 1 | 2 | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 2 | 1 | — | |
Temp °C | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 11 | 10 | 11 | 12 | 14 | 15 | 14 | 13 | 12 | 11 | 12 | 15 | 16 | 19 | 15 | 14 | 14 |
6 | 7 | 8 | 8 | 10 | 10 | 10 | 8 | 6 | 6 | 7 | 8 | 9 | 11 | 12 | 10 | 7 | 9 | 13 | 13 | 17 | 13 | 12 | 11 | |
Swell 1 Height (m) Direction Period (s) | NW 10 | ESE 6 | E 5 | ESE 4 | ESE 4 | ESE 4 | WNW 9 | NW 16 | WNW 15 | WNW 15 | WNW 14 | WNW 14 | WNW 13 | WNW 5 | WNW 12 | WNW 12 | WNW 12 | NW 9 | NW 8 | NW 8 | NW 8 | NW 7 | NW 7 | NW 7 |
 kJ | 48 | 31 | 13 | 5 | 3 | 3 | 8 | 64 | 135 | 167 | 160 | 107 | 99 | 10 | 50 | 48 | 28 | 37 | 42 | 39 | 20 | 19 | 12 | 7 |
Swell 2 Height (m) Direction Period (s) | — | WNW 10 | NW 10 | NW 9 | WNW 9 | WNW 9 | WNW 16 | WNW 9 | — | — | — | — | — | WNW 13 | NW 5 | NW 6 | NW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 11 |
| kJ | — | 38 | 24 | 23 | 8 | 8 | 25 | 8 | — | — | — | — | — | 66 | 7 | 8 | 9 | 27 | 25 | 23 | 23 | 11 | 11 | 9 |
Swell 3 Height (m) Direction Period (s) | — | W 15 | W 15 | W 14 | NW 13 | NW 13 | E 4 | E 3 | — | — | — | — | — | — | — | — | — | — | ESE 3 | — | — | — | — | — |
| kJ | — | 4 | 4 | 4 | 7 | 7 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 6 | — | SSE 3 | — | — | — | — | — | — | — | W 3 | WNW 3 | WNW 4 | — | — | — | — | — | — | — | S 3 | — | — | — |
| kJ | 71 | — | 1 | — | — | — | — | — | — | — | 4 | 12 | 10 | — | — | — | — | — | — | — | 1 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 56 | 27 | 87 | 66 | 42 | 42 | 16 | 0 | 9 | 14 | 162 | 155 | 71 | 9 | 8 | 8 | 16 | 0 | 0 | 0 | 14 | 40 | 40 | 56 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castlerock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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