Surf Forecasts:
How big are the waves at Castlerock today (20 Aug):
- Morning surf: Morning surf (20 Aug, local time) - 4ft (1.2m), 8s period with NNW swell.
- Afternoon surf: Afternoon surf (20 Aug, local time) - 5.5ft (1.7m), 7s period with NNW swell.
- Evening surf: Evening surf (20 Aug, local time) - 5.5ft (1.7m), 7s period with NNW swell.
The current surf forecast for Castlerock at 9AM is: 1.2m 8s primary swell from a North-northwest direction and 0.4m 10s secondary swell from a West-northwest direction, 0.2m 3s secondary swell from a East-northeast direction (forecast issued at 12:00am August 20). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Aug) | 4ft (1.2m) | 8s |
| Afternoon (20 Aug) | 5.5ft (1.7m) | 7s |
| Evening (20 Aug) | 5.5ft (1.7m) | 7s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 9mm), mostly falling on Wed night. Very mild (max 15°C on Sat morning, min 12°C on Wed night). Winds increasing (light winds from the N on Wed night, fresh winds from the N by Thu afternoon). | ||||||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||||||||||
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 | 4 PM | 7 PM | 10 PM | |
Swell Height Map |  |  |  |  |  |  |  |  |  | |||||||||||||||
Wave Height (m) Direction Period (s) | NW 10 | WNW 10 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | N 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 4 | NW 5 | NNW 5 | NNW 5 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 96 | 85 | 130 | 183 | 222 | 285 | 239 | 268 | 239 | 194 | 134 | 126 | 101 | 69 | 51 | 48 | 46 | 32 | 18 | 13 | 13 | 10 | 14 | 19 |
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 | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 11:03PM1.28m | 11:24AM1.21m | 11:54PM1.10m | 1:03PM1.11m | 2:29AM1.01m | 3:46PM1.16m | ||||||||||||||||||
Low Tide | 5:35AM0.63m | 6:11PM0.68m | 6:42AM0.72m | 8:03PM0.77m | 8:39AM0.74m | |||||||||||||||||||
 |  |  |  |  |  | |  | | | | | | | |  | |  | | | | | | | |
 | — | 6:09 | — | — | — | — | — | — | — | 6:11 | — | — | — | — | — | — | — | 6:13 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 8:50 | — | — | — | — | — | — | — | 8:47 | — | — | — | — | — | — | — | 8:45 | — |
mm | 1 | 1 | 2 | 2 | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 12 | 13 | 14 | 14 | 13 | 12 | 13 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 14 | 15 | 15 | 14 | 13 |
Feels °C | 11 | 10 | 9 | 9 | 8 | 7 | 6 | 5 | 6 | 6 | 6 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 10 | 12 | 11 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | NW 10 | WNW 10 | NNW 8 | NNW 8 | NW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | NW 8 | WNW 8 | WNW 8 | W 8 | W 8 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | W 10 | NNW 5 |
| kJ | 96 | 85 | 130 | 183 | 23 | 17 | 17 | 16 | 15 | 7 | 7 | 3 | 6 | 6 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 19 |
Swell 2 Height (m) Direction Period (s) | — | N 9 | WNW 10 | WNW 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 8 | W 10 | W 10 | N 6 | W 10 |
| kJ | — | 2 | 55 | 33 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 1 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 7 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — |
Wind waves Height (m) Direction Period (s) | — | N 4 | — | ENE 3 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | N 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 4 | NW 5 | NNW 5 | — |
| kJ | — | 10 | — | 1 | 222 | 285 | 239 | 268 | 239 | 194 | 134 | 126 | 101 | 69 | 51 | 48 | 46 | 32 | 18 | 13 | 13 | 10 | 14 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 66 | 66 | 66 | 342 | 439 | 1084 | 342 | 303 | 282 | 284 | 74 | 411 | 282 | 266 | 266 | 252 | 266 | 273 | 254 | 254 | 282 | 282 | 251 | 44 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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