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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 31 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
12.1° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today (31 May):
- Morning surf: Morning surf (31 May, local time) - 0.5ft (0.2m), 12s period with WNW swell.
- Afternoon surf: Afternoon surf (31 May, local time) - 1ft (0.3m), 13s period with WNW swell.
- Evening surf: Evening surf (31 May, local time) - 0.5ft (0.2m), 12s period with WNW swell.
The current surf forecast for Castlerock at 4AM is: 0.2m 13s primary swell from a West-northwest direction and 0.2m 6s secondary swell from a West-northwest direction (forecast issued at 12:00am May 31). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 May) | 0.5ft (0.2m) | 12s |
| Afternoon (31 May) | 1ft (0.3m) | 13s |
| Evening (31 May) | 0.5ft (0.2m) | 12s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 9mm), mostly falling on Sat night. Very mild (max 16°C on Sun afternoon, min 11°C on Mon night). Wind will be generally light. | ||||||||||||||||||||||||
Sunday 31 | Monday 1 | Tuesday 2 | ||||||||||||||||||||||
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 12 | WNW 13 | WNW 13 | WNW 12 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | W 12 | W 12 | W 11 | W 11 | W 11 | WNW 11 | W 10 | W 10 | WNW 10 | W 10 | W 10 | WNW 3 | WNW 3 | WNW 3 | W 16 | |
14 | 17 | 16 | 15 | 32 | 33 | 30 | 14 | 14 | 11 | 11 | 10 | 9 | 9 | 11 | 8 | 8 | 10 | 8 | 2 | 2 | 4 | 4 | 5 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross | cross-on | glassy | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross | off | cross-off | cross-off | cross | cross-on | cross-on | cross | cross-off | |
High Tide | 6:43AM1.54m | 7:04PM1.66m | 7:15AM1.51m | 7:37PM1.67m | 7:47AM1.48m | 8:12PM1.65m | ||||||||||||||||||
Low Tide | 00:56AM0.31m | 1:02PM0.27m | 1:33AM0.32m | 1:34PM0.28m | 2:10AM0.35m | 2:07PM0.29m | ||||||||||||||||||
 |  |  | |  | | |  | |  |  | | | | | | | |  | | | | |  | |
 | — | 4:56 | — | — | — | — | — | — | — | 4:54 | — | — | — | — | — | — | — | 4:54 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:53 | — | — | — | — | — | — | — | 9:54 | — | — | — | — | — | — | — | 9:55 | — |
1 | — | — | — | 1 | — | — | — | — | 1 | 1 | — | 1 | — | 1 | 1 | — | — | — | — | — | 1 | — | — | |
Temp °C | 13 | 12 | 12 | 13 | 15 | 16 | 15 | 14 | 13 | 13 | 13 | 14 | 16 | 16 | 15 | 14 | 12 | 11 | 12 | 13 | 13 | 13 | 14 | 12 |
11 | 9 | 7 | 10 | 12 | 13 | 14 | 13 | 11 | 11 | 11 | 12 | 15 | 14 | 14 | 13 | 11 | 9 | 10 | 10 | 10 | 9 | 11 | 9 | |
Swell 1 Height (m) Direction Period (s) | WNW 12 | WNW 13 | WNW 6 | WNW 12 | WNW 13 | WNW 6 | WNW 6 | WNW 6 | WNW 6 | WNW 5 | WNW 5 | W 11 | W 11 | W 11 | WNW 11 | W 10 | WNW 4 | WNW 10 | WNW 6 | W 10 | W 10 | W 10 | W 10 | WNW 5 |
 kJ | 14 | 17 | 4 | 15 | 32 | 6 | 6 | 6 | 3 | 3 | 3 | 10 | 9 | 9 | 11 | 8 | 1 | 10 | 3 | 2 | 2 | 2 | 2 | 2 |
Swell 2 Height (m) Direction Period (s) | WNW 7 | WNW 6 | WNW 13 | WNW 6 | WNW 6 | WNW 13 | WNW 12 | WNW 12 | WNW 12 | W 12 | W 12 | NW 5 | NW 5 | NW 6 | — | ESE 4 | E 4 | E 4 | W 10 | — | — | — | — | W 10 |
| kJ | 5 | 4 | 16 | 3 | 3 | 33 | 30 | 14 | 14 | 11 | 11 | 1 | 1 | 1 | — | 1 | 1 | 1 | 8 | — | — | — | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | N 10 | N 10 | N 9 | N 9 | N 8 | N 7 | N 7 | N 7 | N 7 | N 7 | N 6 | N 6 | — | N 6 | W 10 | — | — | — | — | — | — | W 16 |
| kJ | — | — | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | — | 1 | 8 | — | — | — | — | — | — | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 5 | WNW 3 | WNW 3 | WNW 3 | NW 3 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 4 | 4 | 3 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 42 | 42 | 42 | 42 | 187 | 187 | 16 | 40 | 40 | 40 | 40 | 42 | 40 | 40 | 40 | 42 | 42 | 42 | 83 | 300 | 83 | 380 | 380 | 42 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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