Surf Forecasts:
How big are the waves at Castlerock today (19 Jul):
- Morning surf: Morning surf (19 Jul, local time) - 3.5ft (1.1m), 6s period with NNW swell.
- Afternoon surf: Afternoon surf (19 Jul, local time) - 3ft (0.9m), 6s period with NNW swell.
- Evening surf: Evening surf (19 Jul, local time) - 2ft (0.6m), 7s period with NNW swell.
The current surf forecast for Castlerock at 7AM is: 1.2m 6s primary swell from a North-northwest direction and 0.1m 13s secondary swell from a Northwest direction (forecast issued at 12:00am July 19). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 Jul) | 3.5ft (1.1m) | 6s |
| Afternoon (19 Jul) | 3ft (0.9m) | 6s |
| Evening (19 Jul) | 2ft (0.6m) | 7s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 14°C on Sun night, min 11°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 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) | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 4 | NNW 5 | NNW 5 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 125 | 127 | 103 | 85 | 59 | 53 | 41 | 30 | 30 | 29 | 17 | 27 | 44 | 68 | 80 | 73 | 70 | 68 | 60 | 55 | 59 | 59 | 48 | 45 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | 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 | 10:04AM1.39m | 10:43PM1.72m | 10:47AM1.31m | 11:27PM1.53m | 11:36AM1.22m | |||||||||||||||||||
Low Tide | 4:40AM0.32m | 4:21PM0.19m | 5:22AM0.43m | 5:06PM0.33m | 6:05AM0.53m | 5:58PM0.49m | ||||||||||||||||||
 |  |  | | | |  |  | | |  | | | | | | | | | | | | | | |
 | — | 5:11 | — | — | — | — | — | — | — | 5:13 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:52 | — | — | — | — | — | — | — | 9:52 | — | — | — | — | — | — | — | 9:50 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 11 | 12 | 13 | 13 | 13 | 13 | 13 | 14 | 13 | 13 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 13 | 13 | 12 | 11 |
Feels °C | 7 | 8 | 7 | 8 | 10 | 10 | 9 | 11 | 11 | 11 | 9 | 9 | 10 | 9 | 10 | 10 | 9 | 9 | 9 | 8 | 9 | 9 | 8 | 6 |
Swell 1 Height (m) Direction Period (s) | W 14 | NW 13 | NNW 6 | NW 9 | WNW 12 | NW 12 | NW 12 | NNW 7 | NW 11 | NW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 |
| kJ | 4 | 7 | 103 | 3 | 14 | 5 | 5 | 30 | 5 | 5 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 8 |
Swell 2 Height (m) Direction Period (s) | — | — | NW 13 | NW 12 | W 9 | W 9 | W 9 | NW 12 | W 9 | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 6 | 6 | 2 | 1 | 1 | 5 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 7 | NNW 6 | — | NNW 6 | NNW 6 | NNW 7 | NNW 7 | — | NNW 7 | NNW 7 | NNW 4 | NNW 5 | NNW 5 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 |
| kJ | 125 | 127 | — | 85 | 59 | 53 | 41 | — | 30 | 29 | 17 | 27 | 44 | 68 | 80 | 73 | 70 | 68 | 60 | 55 | 59 | 59 | 48 | 45 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 266 | 107 | 107 | 266 | 266 | 266 | 266 | 131 | 131 | 251 | 266 | 270 | 334 | 570 | 300 | 300 | 251 | 251 | 131 | 131 | 419 | 572 | 572 | 286 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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