Surf Forecasts:
How big are the waves at Castlerock today (17 Aug):
- Afternoon surf: Afternoon surf (17 Aug, local time) - 0.5ft (0.2m), 9s period with W swell.
- Evening surf: Evening surf (17 Aug, local time) - 1ft (0.3m), 6s period with W swell.
The current surf forecast for Castlerock at 11PM is: 0.3m 6s primary swell from a West direction and 0.1m 8s secondary swell from a West direction, 0.1m 7s secondary swell from a North direction (forecast issued at 06:00pm August 17). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Aug) | - | - |
| Afternoon (17 Aug) | 0.5ft (0.2m) | 9s |
| Evening (17 Aug) | 1ft (0.3m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 19mm), heaviest on Mon afternoon. Very mild (max 16°C on Mon afternoon, min 13°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||||
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) | NW 6 | W 8 | W 6 | WNW 6 | WNW 6 | WNW 6 | WNW 6 | WNW 8 | WNW 9 | WNW 10 | WNW 12 | NW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 6 | 1 | 6 | 28 | 25 | 29 | 42 | 69 | 103 | 229 | 365 | 360 | 311 | 300 | 277 | 220 | 216 | 160 | 127 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross | on | cross-on |
High Tide | 9:56PM1.68m | 10:01AM1.44m | 10:28PM1.47m | 10:38AM1.33m | |||||||||||||||
Low Tide | 3:45PM0.18m | 4:23AM0.40m | 4:23PM0.35m | 4:55AM0.52m | 5:08PM0.52m | ||||||||||||||
 | |  |  | |  | | |  | | |  | | | |  | | |  | |
 | — | — | — | — | 6:05 | — | — | — | — | — | — | — | 6:07 | — | — | — | — | — | — |
 | — | 8:57 | — | — | — | — | — | — | — | 8:54 | — | — | — | — | — | — | — | 8:52 | — |
mm | 2 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | 2 | 2 | — |
Temp °C | 16 | 15 | 16 | 16 | 15 | 15 | 15 | 16 | 16 | 15 | 14 | 13 | 13 | 13 | 13 | 16 | 16 | 15 | 14 |
Feels °C | 15 | 14 | 14 | 13 | 11 | 11 | 10 | 11 | 11 | 11 | 11 | 8 | 8 | 9 | 10 | 14 | 14 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | NW 6 | NW 6 | W 8 | N 7 | N 7 | — | — | — | WNW 9 | WNW 10 | WNW 12 | NW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 |
| kJ | 6 | 1 | 1 | 1 | 1 | — | — | — | 103 | 229 | 365 | 360 | 311 | 300 | 277 | 220 | 216 | 160 | 127 |
Swell 2 Height (m) Direction Period (s) | W 8 | W 8 | N 7 | — | — | — | — | — | — | — | — | — | — | — | — | S 3 | — | — | — |
| kJ | 6 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Swell 3 Height (m) Direction Period (s) | N 7 | N 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | W 6 | WNW 6 | WNW 6 | WNW 6 | WNW 6 | WNW 8 | WSW 3 | — | WSW 2 | SW 2 | SW 2 | SW 3 | SSW 3 | SW 3 | — | — | — |
| kJ | — | — | 6 | 28 | 25 | 29 | 42 | 69 | 1 | — | 1 | 1 | 1 | 2 | 1 | 2 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 40 | 42 | 336 | 340 | 339 | 387 | 300 | 414 | 398 | 398 | 9 | 340 | 9 | 0 | 14 | 0 | 9 | 66 | 14 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
Header Global | |||||||||||||||||||
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