Surf Forecasts:
How big are the waves at Castlerock today (19 Aug):
- Morning surf: Morning surf (19 Aug, local time) - 3ft (0.9m), 10s period with WNW swell.
- Afternoon surf: Afternoon surf (19 Aug, local time) - 3ft (0.9m), 10s period with WNW swell.
- Evening surf: Evening surf (19 Aug, local time) - 2.5ft (0.8m), 10s period with WNW swell.
The current surf forecast for Castlerock at 5AM is: 1.1m 11s primary swell from a Northwest direction (forecast issued at 12:00am August 19). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 Aug) | 3ft (0.9m) | 10s |
| Afternoon (19 Aug) | 3ft (0.9m) | 10s |
| Evening (19 Aug) | 2.5ft (0.8m) | 10s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 13mm), heaviest on Wed afternoon. Very mild (max 15°C on Wed morning, min 12°C on Tue night). Winds increasing (calm on Wed afternoon, fresh winds from the N by Thu night). | ||||||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||||||||||
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) | WNW 11 | NW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 10 | NW 10 | NW 10 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 323 | 263 | 234 | 171 | 168 | 122 | 122 | 122 | 96 | 98 | 94 | 113 | 167 | 255 | 212 | 239 | 247 | 206 | 188 | 134 | 108 | 83 | 72 | 50 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | off | cross-off | cross-off | glassy | cross-on | on | on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 10:28PM1.47m | 10:38AM1.33m | 11:03PM1.28m | 11:24AM1.21m | 11:54PM1.10m | 1:03PM1.11m | ||||||||||||||||||
Low Tide | 4:55AM0.52m | 5:08PM0.52m | 5:35AM0.63m | 6:11PM0.68m | 6:42AM0.72m | 8:03PM0.77m | ||||||||||||||||||
 |  |  |  | | |  |  |  | | | |  | | | | | |  | | | | |  | |
 | — | 6:07 | — | — | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:11 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 8:52 | — | — | — | — | — | — | — | 8:50 | — | — | — | — | — | — | — | 8:47 | — |
mm | — | — | — | 1 | 1 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 12 | 13 | 13 | 15 | 15 | 15 | 14 | 13 | 13 | 13 | 13 | 14 | 13 | 13 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 12 |
Feels °C | 11 | 9 | 10 | 10 | 12 | 14 | 15 | 13 | 11 | 11 | 11 | 10 | 9 | 6 | 6 | 5 | 6 | 7 | 6 | 8 | 8 | 8 | 8 | 7 |
Swell 1 Height (m) Direction Period (s) | WNW 11 | NW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 10 | NW 10 | NW 10 | NNW 8 | NW 10 | WNW 9 | WNW 9 | WNW 9 | — | WNW 8 | NW 8 | WNW 8 | WNW 8 | WNW 8 | NW 8 | W 8 |
| kJ | 323 | 263 | 234 | 171 | 168 | 122 | 122 | 122 | 96 | 98 | 94 | 113 | 23 | 17 | 17 | 8 | — | 7 | 3 | 6 | 6 | 6 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | N 9 | NNW 8 | WNW 10 | E 4 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 2 | 7 | 38 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | ENE 4 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NE 3 | NE 3 | — | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 |
| kJ | — | — | — | — | — | — | — | — | — | 2 | 3 | — | 167 | 255 | 212 | 239 | 247 | 206 | 188 | 134 | 108 | 83 | 72 | 50 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 9 | 9 | 0 | 0 | 9 | 0 | 0 | 8 | 66 | 66 | 16 | 413 | 339 | 339 | 339 | 303 | 282 | 282 | 283 | 270 | 342 | 266 | 266 | 266 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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