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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 am Thursday 21 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
11.0° C
(Which is normal for this time of year)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 2PM is: 0.5m 7s primary swell from a Northwest direction and 0.2m 11s secondary swell from a West-northwest direction (forecast issued at 06:00am May 21). The wind direction is predicted to be offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 2ft (0.6m) | 8s |
| Afternoon (21 May) | 1.5ft (0.5m) | 7s |
| Evening (21 May) | 1.5ft (0.4m) | 7s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 7mm), mostly falling on Thu afternoon. Very mild (max 19°C on Sat afternoon, min 12°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 23 | Sun 24 | |||||||||||||||||||||
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 8 | NW 8 | NW 8 | NW 8 | WNW 11 | NW 7 | WNW 11 | W 11 | W 11 | W 11 | W 12 | W 11 | W 12 | W 12 | W 12 | W 11 | W 12 | W 6 | W 12 | W 11 | WNW 7 | WNW 10 | WNW 10 | WNW 10 | |
31 | 58 | 41 | 28 | 23 | 12 | 11 | 9 | 9 | 10 | 10 | 10 | 11 | 11 | 11 | 10 | 11 | 3 | 3 | 3 | 5 | 9 | 9 | 19 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | off | off | off | off | off | off | off | off | off | off | off | off | cross-off | glassy | cross-off | off | off | off | cross-off | cross-off | glassy | off | off | |
High Tide | 10:02AM1.34m | 10:43PM1.68m | 11:02AM1.19m | 11:57PM1.59m | 12:22PM1.09m | |||||||||||||||||||
Low Tide | 4:31AM0.33m | 4:18PM0.33m | 5:43AM0.45m | 5:20PM0.41m | 7:00AM0.52m | 6:30PM0.46m | ||||||||||||||||||
 |  |  | | | | |  | | | | | | | |  | |  | |  | | |  | | |
 | 5:09 | — | — | — | — | — | — | — | 5:07 | — | — | — | — | — | — | — | 5:05 | — | — | — | — | — | — | 5:05 |
 | — | — | — | — | — | 9:37 | — | — | — | — | — | — | — | 9:39 | — | — | — | — | — | — | — | 9:42 | — | 9:43 |
1 | 2 | — | — | 1 | 3 | 1 | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | |
Temp °C | 11 | 12 | 15 | 17 | 18 | 15 | 15 | 14 | 13 | 12 | 14 | 16 | 17 | 16 | 14 | 13 | 12 | 12 | 13 | 16 | 19 | 17 | 16 | 15 |
7 | 9 | 13 | 15 | 16 | 13 | 13 | 11 | 9 | 9 | 11 | 13 | 14 | 14 | 14 | 12 | 10 | 10 | 10 | 13 | 16 | 16 | 15 | 12 | |
Swell 1 Height (m) Direction Period (s) | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 | NW 7 | NW 7 | NW 7 | WNW 7 | W 11 | ESE 3 | ESE 3 | W 12 | W 12 | W 12 | W 11 | W 12 | W 6 | WNW 5 | WNW 5 | WNW 7 | WNW 10 | WNW 10 | WNW 10 |
 kJ | 31 | 58 | 41 | 28 | 19 | 12 | 7 | 7 | 4 | 10 | 1 | 1 | 11 | 11 | 11 | 10 | 11 | 2 | 3 | 3 | 5 | 9 | 9 | 19 |
Swell 2 Height (m) Direction Period (s) | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 11 | W 11 | WNW 6 | W 12 | W 11 | ESE 3 | — | ESE 4 | E 4 | — | W 10 | W 12 | W 11 | W 11 | — | — | — |
| kJ | 28 | 27 | 25 | 12 | 23 | 11 | 11 | 9 | 9 | 4 | 10 | 10 | 1 | — | 1 | 1 | — | 2 | 3 | 2 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | ESE 3 | — | — | N 9 | N 9 | N 8 | N 8 | N 8 | NW 6 | NW 6 | NW 6 | NW 6 | — | N 6 | N 6 | W 12 | — | — | — | — | — | — |
| kJ | — | — | 1 | — | — | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 2 | 1 | — | 1 | 1 | 3 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 2 | SE 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 8 | 0 | 0 | 14 | 42 | 56 | 56 | 121 | 67 | 56 | 56 | 40 | 42 | 42 | 40 | 42 | 41 | 40 | 60 | 42 | 42 | 42 | 40 | 40 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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