Surf Forecasts:
How big are the waves at Castlerock today (21 Aug):
- Morning surf: Morning surf (21 Aug, local time) - 4ft (1.2m), 6s period with NNW swell.
- Afternoon surf: Afternoon surf (21 Aug, local time) - 3.5ft (1.1m), 6s period with NNW swell.
- Evening surf: Evening surf (21 Aug, local time) - 3.5ft (1.0m), 6s period with NNW swell.
The current surf forecast for Castlerock at 10AM is: 1.2m 6s primary swell from a North-northwest direction and 0.1m 8s secondary swell from a Northwest direction (forecast issued at 06:00am August 21). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Aug) | 4ft (1.2m) | 6s |
| Afternoon (21 Aug) | 3.5ft (1.1m) | 6s |
| Evening (21 Aug) | 3.5ft (1.0m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 16°C on Sat afternoon, min 12°C on Sat night). Wind will be generally light. | |||||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||||||||
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 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NW 5 | NW 4 | NW 5 | NW 5 | NW 5 | NW 7 | NW 7 | NW 7 | NW 11 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 139 | 112 | 101 | 104 | 89 | 72 | 62 | 62 | 50 | 43 | 32 | 17 | 12 | 8 | 5 | 5 | 6 | 4 | 10 | 16 | 23 | 29 | 29 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | glassy | on | on | cross |
High Tide | 1:03PM1.11m | 2:29AM1.01m | 3:46PM1.16m | 4:16AM1.09m | 4:48PM1.29m | ||||||||||||||||||
Low Tide | 6:42AM0.72m | 8:03PM0.77m | 8:39AM0.74m | 10:15PM0.72m | 10:18AM0.64m | ||||||||||||||||||
 |  |  | | | |  |  | |  | | | | | | | | | | | | | | |
 | 6:11 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — |
 | — | — | — | — | — | 8:47 | — | — | — | — | — | — | — | 8:45 | — | — | — | — | — | — | — | 8:43 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 15 | 16 | 15 | 14 | 12 | 12 | 12 | 13 | 15 | 16 | 14 | 14 |
Feels °C | 7 | 8 | 8 | 7 | 7 | 8 | 8 | 8 | 8 | 9 | 9 | 12 | 12 | 12 | 13 | 11 | 10 | 10 | 12 | 14 | 14 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 8 | NW 8 | — | WNW 8 | W 8 | W 8 | — | — | W 7 | W 7 | W 7 | W 7 | W 10 | W 10 | NW 4 | NW 5 | NW 5 | NW 5 | NW 7 | NW 7 | NW 7 | NW 7 |
| kJ | 7 | 7 | 3 | — | 6 | 1 | 1 | — | — | 1 | 1 | 1 | 1 | 2 | 2 | 5 | 6 | 4 | 10 | 16 | 23 | 29 | 29 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | W 8 | W 7 | W 10 | W 6 | W 6 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | N 11 | NW 11 | NW 11 |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 1 | 1 | 4 | 4 | 3 | 3 | 3 | 3 | 5 | 29 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 10 | — | — | N 6 | W 6 | W 6 | W 6 | — | — | NW 11 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | 1 | 1 | 1 | 1 | — | — | 5 | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NW 5 | — | — | — | — | — | — | — | — |
| kJ | 139 | 112 | 101 | 104 | 89 | 72 | 62 | 62 | 50 | 43 | 32 | 17 | 12 | 8 | 5 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 282 | 284 | 266 | 282 | 266 | 266 | 266 | 266 | 266 | 273 | 254 | 266 | 266 | 273 | 254 | 283 | 251 | 251 | 42 | 42 | 42 | 40 | 8 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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