Surf Forecasts:
How big are the waves at Castlerock today (31 Aug):
- Morning surf: Morning surf (31 Aug, local time) - 2.5ft (0.7m), 4s period with NW swell.
- Afternoon surf: Afternoon surf (31 Aug, local time) - 3.5ft (1.0m), 6s period with NW swell.
- Evening surf: Evening surf (31 Aug, local time) - 2.5ft (0.8m), 6s period with NW swell.
The current surf forecast for Castlerock at 2PM is: 1.1m 6s primary swell from a Northwest direction and 0.1m 10s secondary swell from a West direction (forecast issued at 06:00am August 31). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Aug) | 2.5ft (0.7m) | 4s |
| Afternoon (31 Aug) | 3.5ft (1.0m) | 6s |
| Evening (31 Aug) | 2.5ft (0.8m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 14mm), heaviest on Tue afternoon. Very mild (max 18°C on Wed night, min 12°C on Mon night). Winds decreasing (fresh winds from the WNW on Mon morning, calm by Tue night). | |||||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||||||||
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 |  |  |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | NNW 6 | NW 3 | NW 4 | NW 5 | NW 6 | NW 7 | NW 6 | NW 6 | NNW 6 | WNW 6 | WNW 8 | WNW 8 | WNW 9 | WNW 8 | NW 8 | NW 8 | WNW 8 | WNW 8 | WNW 8 | NW 6 | NNW 8 | NNW 8 | NNW 8 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 4 | 4 | 32 | 62 | 72 | 61 | 38 | 31 | 15 | 14 | 35 | 36 | 86 | 92 | 69 | 53 | 26 | 25 | 25 | 12 | 22 | 38 | 36 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | glassy | cross-off | cross-off | cross-off | cross-off | off | off | cross-off |
High Tide | 8:27AM1.68m | 8:50PM1.89m | 9:01AM1.64m | 9:24PM1.77m | 9:39AM1.55m | ||||||||||||||||||
Low Tide | 2:42AM0.17m | 2:34PM0.08m | 3:10AM0.21m | 3:05PM0.16m | 3:40AM0.30m | 3:42PM0.28m | |||||||||||||||||
 |  |  | |  | |  |  | | | |  | | |  | | | | | | | | | |
 | 6:30 | — | — | — | — | — | — | — | 6:31 | — | — | — | — | — | — | — | 6:33 | — | — | — | — | — | — |
 | — | — | — | — | — | 8:22 | — | — | — | — | — | — | — | 8:21 | — | — | — | — | — | — | — | 8:17 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 5 | 1 | — | — | — | 1 | 2 | 1 | — | — |
Temp °C | 13 | 14 | 14 | 15 | 15 | 15 | 14 | 13 | 12 | 13 | 15 | 15 | 15 | 14 | 14 | 13 | 13 | 13 | 14 | 14 | 16 | 17 | 18 |
Feels °C | 11 | 10 | 9 | 9 | 10 | 12 | 10 | 10 | 9 | 9 | 10 | 11 | 10 | 13 | 14 | 13 | 12 | 11 | 12 | 12 | 14 | 16 | 16 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | W 9 | W 11 | W 10 | W 10 | NW 7 | NW 6 | NW 6 | NNW 6 | WNW 6 | WNW 8 | WNW 8 | WNW 9 | WNW 8 | NW 8 | NW 8 | WNW 8 | WNW 8 | NW 6 | NW 6 | NNW 8 | NNW 8 | NNW 8 |
| kJ | 4 | 2 | 2 | 2 | 2 | 61 | 38 | 31 | 15 | 14 | 35 | 36 | 86 | 92 | 69 | 53 | 26 | 25 | 9 | 9 | 22 | 38 | 36 |
Swell 2 Height (m) Direction Period (s) | W 9 | N 6 | — | — | — | W 10 | W 10 | W 9 | WNW 6 | NNW 6 | NNW 6 | NNW 6 | N 6 | N 6 | — | — | NW 6 | NW 6 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 7 |
| kJ | 2 | 1 | — | — | — | 2 | 8 | 2 | 8 | 7 | 3 | 3 | 1 | 1 | — | — | 9 | 8 | 25 | 12 | 12 | 11 | 5 |
Swell 3 Height (m) Direction Period (s) | W 11 | W 11 | — | — | — | — | — | — | W 9 | W 9 | — | NW 6 | — | — | — | — | — | — | — | NNW 8 | — | — | — |
| kJ | 2 | 2 | — | — | — | — | — | — | 6 | 2 | — | 1 | — | — | — | — | — | — | — | 7 | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | NW 3 | NW 4 | NW 5 | NW 6 | — | — | SW 2 | SW 2 | SW 3 | SW 3 | SW 3 | W 3 | WSW 3 | — | — | — | — | — | — | — | SSE 3 | — |
| kJ | 1 | 4 | 32 | 62 | 72 | — | — | 1 | 1 | 2 | 2 | 5 | 5 | 2 | — | — | — | — | — | — | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 350 | 366 | 405 | 387 | 187 | 187 | 187 | 42 | 42 | 162 | 187 | 391 | 42 | 9 | 0 | 8 | 14 | 14 | 40 | 44 | 44 | 42 | 54 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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