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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 12 am Sunday 17 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 5AM is: 1.1m 14s primary swell from a West-northwest direction (forecast issued at 12:00am May 17). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 May) | 4.5ft (1.3m) | 13s |
| Afternoon (17 May) | 4.5ft (1.3m) | 13s |
| Evening (17 May) | 3.5ft (1.1m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 13mm), heaviest on Sun afternoon. Very mild (max 13°C on Tue afternoon, min 7°C on Sat night). Winds increasing (calm on Mon morning, fresh winds from the SE by Mon night). | ||||||||||||||||||||||||
Sunday 17 | Monday 18 | Tuesday 19 | ||||||||||||||||||||||
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 11 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | NW 13 | WNW 13 | NW 12 | NW 12 | WNW 12 | WNW 12 | NW 11 | NW 11 | WNW 11 | NW 10 | NW 10 | NW 10 | WNW 10 | NW 10 | WNW 10 | NW 9 | NW 9 | WNW 9 | WNW 13 | |
138 | 460 | 536 | 634 | 581 | 494 | 437 | 353 | 325 | 243 | 231 | 176 | 172 | 149 | 112 | 104 | 80 | 65 | 47 | 36 | 22 | 21 | 8 | 17 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | glassy | cross-on | cross-on | cross | glassy | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | |
High Tide | 6:55AM1.88m | 7:17PM1.85m | 7:39AM1.80m | 8:01PM1.88m | 8:25AM1.67m | 8:49PM1.85m | ||||||||||||||||||
Low Tide | 00:49AM0.08m | 1:15PM0.08m | 1:38AM0.07m | 1:55PM0.12m | 2:31AM0.11m | 2:38PM0.18m | ||||||||||||||||||
 |  |  |  |  |  |  | |  | | | | | | | | |  | | | | | | | |
 | — | 5:16 | — | — | — | — | — | — | — | 5:13 | — | — | — | — | — | — | — | 5:11 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:31 | — | — | — | — | — | — | — | 9:32 | — | — | — | — | — | — | — | 9:35 | — |
— | — | — | — | 1 | — | 5 | — | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — | 2 | 1 | 3 | |
Temp °C | 7 | 7 | 7 | 10 | 10 | 10 | 8 | 7 | 8 | 8 | 8 | 9 | 10 | 11 | 12 | 9 | 9 | 9 | 9 | 10 | 12 | 13 | 13 | 11 |
2 | 2 | 2 | 5 | 5 | 7 | 5 | 5 | 5 | 5 | 6 | 8 | 7 | 8 | 8 | 4 | 3 | 2 | 2 | 6 | 10 | 10 | 10 | 8 | |
Swell 1 Height (m) Direction Period (s) | WNW 11 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | NW 13 | WNW 13 | NW 12 | NW 12 | WNW 12 | WNW 12 | NW 11 | NW 11 | WNW 11 | NW 10 | NW 10 | NW 10 | WNW 10 | NW 10 | WNW 10 | ESE 5 | E 5 | WNW 9 | WNW 9 |
 kJ | 138 | 460 | 536 | 634 | 581 | 494 | 437 | 353 | 325 | 243 | 231 | 176 | 172 | 149 | 112 | 104 | 80 | 65 | 47 | 36 | 20 | 7 | 8 | 8 |
Swell 2 Height (m) Direction Period (s) | NW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 15 | W 15 | NW 9 | NW 9 | E 4 | WNW 13 |
| kJ | 102 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | 22 | 21 | 3 | 17 |
Swell 3 Height (m) Direction Period (s) | WNW 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 14 | NW 13 | NW 13 | E 3 |
| kJ | 46 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 7 | 7 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 2 | SE 3 | ESE 4 | ESE 5 | ESE 5 | — | — | SW 2 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 11 | 47 | 48 | — | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 9 | 9 | 9 | 9 | 9 | 0 | 0 | 0 | 9 | 9 | 8 | 0 | 2 | 2 | 2 | 2 | 16 | 121 | 162 | 16 | 27 | 42 | 42 | 40 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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