Surf Forecasts:
How big are the waves at Castlerock today (31 Aug):
- Morning surf: Morning surf (31 Aug, local time) - 2.5ft (0.8m), 4s period with NW swell.
- Afternoon surf: Afternoon surf (31 Aug, local time) - 3.5ft (1.1m), 6s period with NW swell.
- Evening surf: Evening surf (31 Aug, local time) - 2.5ft (0.7m), 6s period with NW swell.
The current surf forecast for Castlerock at 12AM is: 0.2m 9s primary swell from a West direction and 0.2m 6s secondary swell from a North-northwest direction (forecast issued at 06:00pm August 30). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Aug) | 2.5ft (0.8m) | 4s |
| Afternoon (31 Aug) | 3.5ft (1.1m) | 6s |
| Evening (31 Aug) | 2.5ft (0.7m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 9mm), mostly falling on Sun afternoon. Very mild (max 17°C on Tue morning, min 12°C on Mon night). Winds increasing (calm on Sun afternoon, fresh winds from the WNW by Mon morning). | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | |||||||||||||||||
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 |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 6 | W 9 | NNW 6 | NW 4 | NW 4 | NW 5 | NW 6 | NW 7 | NW 6 | NW 6 | NW 6 | WNW 6 | WNW 7 | WNW 8 | WNW 9 | WNW 8 | WNW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 8 | 4 | 3 | 6 | 4 | 5 | 36 | 74 | 91 | 63 | 39 | 31 | 23 | 17 | 29 | 58 | 119 | 111 | 86 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-on | cross-on | cross | cross | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:18PM1.95m | 8:27AM1.68m | 8:50PM1.89m | 9:01AM1.64m | 9:24PM1.77m | ||||||||||||||
Low Tide | 2:06PM0.03m | 2:42AM0.17m | 2:34PM0.08m | 3:10AM0.21m | 3:05PM0.16m | ||||||||||||||
 |  |  |  | |  |  | | | |  | | |  | | | | | | |
 | — | — | — | — | 6:30 | — | — | — | — | — | — | — | 6:31 | — | — | — | — | — | — |
 | — | 8:25 | — | — | — | — | — | — | — | 8:22 | — | — | — | — | — | — | — | 8:21 | — |
mm | 1 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — |
Temp °C | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 14 | 15 | 15 | 14 | 13 | 12 | 14 | 15 | 17 | 16 | 15 | 15 |
Feels °C | 16 | 16 | 14 | 12 | 12 | 10 | 7 | 8 | 10 | 12 | 11 | 10 | 8 | 10 | 10 | 13 | 13 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | W 9 | — | W 11 | W 10 | NW 7 | NW 6 | NW 6 | NW 6 | WNW 6 | WNW 7 | WNW 8 | WNW 9 | WNW 8 | WNW 8 |
| kJ | 8 | 4 | 3 | 3 | 4 | 2 | — | 2 | 2 | 63 | 39 | 31 | 23 | 17 | 29 | 58 | 119 | 111 | 86 |
Swell 2 Height (m) Direction Period (s) | W 10 | W 10 | W 9 | W 9 | W 9 | N 6 | — | — | — | W 10 | W 10 | W 9 | W 9 | NNW 6 | NNW 6 | NNW 6 | N 6 | N 6 | — |
| kJ | 2 | 2 | 2 | 6 | 2 | 1 | — | — | — | 2 | 8 | 7 | 6 | 8 | 4 | 4 | 1 | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | — | W 12 | — | W 11 | W 11 | — | — | — | — | — | — | — | W 9 | — | — | — | — | — |
| kJ | — | — | 3 | — | 2 | 2 | — | — | — | — | — | — | — | 2 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NW 4 | NW 4 | NW 5 | NW 6 | — | — | WSW 2 | SW 2 | SW 3 | SW 3 | WSW 3 | — | — | — |
| kJ | — | — | — | — | — | 5 | 36 | 74 | 91 | — | — | 1 | 1 | 2 | 3 | 3 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 40 | 63 | 66 | 42 | 300 | 366 | 411 | 557 | 187 | 187 | 42 | 42 | 187 | 121 | 187 | 187 | 187 | 42 | 0 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
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