Surf Forecasts:
How big are the waves at Castlerock today (20 Jul):
- Morning surf: Morning surf (20 Jul, local time) - 2.5ft (0.8m), 5s period with NNW swell.
- Afternoon surf: Afternoon surf (20 Jul, local time) - 3ft (0.9m), 6s period with NNW swell.
- Evening surf: Evening surf (20 Jul, local time) - 3ft (0.9m), 7s period with NNW swell.
The current surf forecast for Castlerock at 8AM is: 0.7m 5s primary swell from a North-northwest direction and 0.2m 11s secondary swell from a West-northwest direction (forecast issued at 12:00am July 20). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Jul) | 2.5ft (0.8m) | 5s |
| Afternoon (20 Jul) | 3ft (0.9m) | 6s |
| Evening (20 Jul) | 3ft (0.9m) | 7s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 15°C on Wed morning, min 11°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 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) | NNW 7 | NNW 7 | NNW 4 | NNW 5 | NNW 5 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NW 7 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 30 | 29 | 17 | 32 | 44 | 58 | 73 | 79 | 77 | 73 | 78 | 64 | 77 | 77 | 69 | 66 | 64 | 68 | 75 | 77 | 64 | 59 | 59 | 47 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 10:43PM1.72m | 10:47AM1.31m | 11:27PM1.53m | 11:36AM1.22m | 00:19AM1.35m | 12:45PM1.16m | ||||||||||||||||||
Low Tide | 5:22AM0.43m | 5:06PM0.33m | 6:05AM0.53m | 5:58PM0.49m | 6:55AM0.61m | 7:05PM0.62m | ||||||||||||||||||
 | |  | | | |  | |  | | | | | | | | | |  | | | | | | |
 | — | 5:13 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:52 | — | — | — | — | — | — | — | 9:50 | — | — | — | — | — | — | — | 9:49 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 12 | 12 | 12 | 13 | 15 | 15 | 15 | 14 |
Feels °C | 11 | 11 | 10 | 9 | 9 | 9 | 9 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 7 | 6 | 7 | 8 | 9 | 10 | 12 | 12 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | W 9 | W 9 | W 9 | W 9 | W 9 | W 9 | W 9 | W 9 |
| kJ | 5 | 5 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
Swell 2 Height (m) Direction Period (s) | W 9 | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 7 | NNW 7 | NNW 4 | NNW 5 | NNW 5 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NW 7 |
| kJ | 30 | 29 | 17 | 32 | 44 | 58 | 73 | 79 | 77 | 73 | 78 | 64 | 77 | 77 | 69 | 66 | 64 | 68 | 75 | 77 | 64 | 59 | 59 | 47 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 131 | 131 | 266 | 270 | 342 | 300 | 281 | 251 | 328 | 251 | 353 | 385 | 1263 | 572 | 286 | 286 | 286 | 286 | 286 | 309 | 54 | 54 | 1288 | 54 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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