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Castlerock Surf Forecast
/ Londonderry (4 surf breaks) /
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 6 pm Wednesday 27 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
11.8° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today (27 May):
- Afternoon surf: Afternoon surf (27 May, local time) - 1.5ft (0.4m), 7s period with NNW swell.
- Evening surf: Evening surf (27 May, local time) - 1.5ft (0.4m), 7s period with NW swell.
The current surf forecast for Castlerock at 10PM is: 0.4m 7s primary swell from a Northwest direction and 0.2m 10s secondary swell from a West-northwest direction (forecast issued at 06:00pm May 27). An open ocean swell of 0.3m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (27 May) | - | - |
| Afternoon (27 May) | 1.5ft (0.4m) | 7s |
| Evening (27 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 ForecastSome drizzle, heaviest during Thu night. Warm (max 21°C on Thu afternoon, min 12°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||||
Wed 27 | Thursday 28 | Friday 29 | Sat 30 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
NNW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NNW 6 | NNW 6 | NNW 6 | NW 9 | NW 8 | NW 8 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | WNW 8 | WNW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 | NW 7 | |
19 | 12 | 12 | 11 | 11 | 4 | 4 | 4 | 3 | 3 | 3 | 5 | 4 | 15 | 14 | 21 | 90 | 43 | 65 | 65 | 50 | 46 | 27 | 26 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | off | off | off | off | off | |
High Tide | 4:49PM1.38m | 5:02AM1.56m | 5:25PM1.48m | 5:37AM1.56m | 5:59PM1.56m | 6:11AM1.55m | ||||||||||||||||||
Low Tide | 10:53PM0.41m | 11:28AM0.34m | 11:38PM0.37m | 12:00PM0.30m | 00:18AM0.33m | 12:30PM0.28m | ||||||||||||||||||
 |  |  | |  | | | | | |  |  | |  | | | | | | | | | | | |
 | — | — | — | — | 4:58 | — | — | — | — | — | — | — | 4:58 | — | — | — | — | — | — | — | 4:56 | — | — | — |
 | — | 9:47 | — | — | — | — | — | — | — | 9:49 | — | — | — | — | — | — | — | 9:51 | — | — | — | — | — | 9:52 |
— | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 19 | 18 | 17 | 15 | 13 | 12 | 15 | 18 | 21 | 20 | 16 | 14 | 13 | 14 | 14 | 16 | 16 | 16 | 14 | 13 | 12 | 12 | 15 | 17 |
16 | 16 | 15 | 11 | 9 | 8 | 11 | 14 | 18 | 18 | 14 | 11 | 8 | 10 | 10 | 13 | 13 | 13 | 12 | 11 | 10 | 9 | 12 | 14 | |
Swell 1 Height (m) Direction Period (s) | NNW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NNW 6 | NNW 6 | NNW 6 | NW 6 | ESE 5 | ESE 5 | ESE 5 | E 4 | NW 10 | NW 9 | NW 9 | W 12 | WNW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 | NW 7 |
 kJ | 19 | 12 | 12 | 11 | 11 | 4 | 4 | 4 | 1 | 14 | 9 | 4 | 1 | 15 | 14 | 21 | 3 | 43 | 65 | 65 | 50 | 46 | 27 | 26 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 10 | — | WNW 7 | — | — | W 12 | W 12 | — | W 16 | W 16 | W 16 | W 15 |
| kJ | 10 | 10 | 9 | 9 | 9 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | — | 5 | — | — | 3 | 3 | — | 5 | 5 | 5 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NW 6 | NW 6 | NW 11 | NW 8 | — | W 15 | W 13 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 1 | 1 | 5 | 2 | — | 5 | 4 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | E 3 | ESE 3 | ESE 3 | ESE 2 | E 3 | ESE 4 | ESE 4 | ESE 4 | ESE 4 | — | — | — | — | S 2 | SW 2 | W 3 | WNW 8 | W 4 | — | — | — | — | — | — |
| kJ | 3 | 3 | 1 | 1 | 5 | 10 | 16 | 19 | 20 | — | — | — | — | 1 | 2 | 10 | 90 | 6 | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 40 | 40 | 40 | 40 | 40 | 40 | 290 | 390 | 559 | 707 | 266 | 266 | 288 | 42 | 187 | 384 | 187 | 187 | 0 | 0 | 8 | 8 | 14 | 40 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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