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 9PM is: 0.6m 7s primary swell from a North-northwest direction and 0.1m 12s secondary swell from a Northwest direction (forecast issued at 12:00pm 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 13°C on Sun morning, min 11°C on Tue night). Wind will be generally light. | |||||||||||||||||||||
Sun 19 | Monday 20 | Tuesday 21 | |||||||||||||||||||
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 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 5 | NNW 5 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 85 | 53 | 53 | 41 | 30 | 30 | 29 | 19 | 33 | 51 | 60 | 91 | 81 | 79 | 73 | 70 | 68 | 68 | 68 | 68 | 48 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 |
High Tide | 10:04AM1.39m | 10:43PM1.72m | 10:47AM1.31m | 11:27PM1.53m | 11:36AM1.22m | ||||||||||||||||
Low Tide | 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 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 |
Feels °C | 8 | 9 | 10 | 10 | 11 | 11 | 10 | 9 | 9 | 9 | 9 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 6 |
Swell 1 Height (m) Direction Period (s) | W 9 | WNW 12 | NW 12 | NW 12 | NNW 7 | NW 11 | NW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 11 | WNW 10 | NNW 7 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 |
| kJ | 2 | 14 | 5 | 5 | 30 | 5 | 5 | 12 | 11 | 11 | 11 | 11 | 10 | 79 | 10 | 10 | 9 | 9 | 9 | 9 | 8 |
Swell 2 Height (m) Direction Period (s) | NW 12 | W 9 | W 9 | W 9 | NW 12 | W 9 | W 8 | — | — | — | — | — | — | WNW 10 | — | — | — | — | — | — | — |
| kJ | 6 | 2 | 1 | 1 | 5 | 1 | 1 | — | — | — | — | — | — | 10 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 7 | NNW 7 | — | NNW 7 | NNW 7 | NNW 5 | NNW 5 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | — | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 |
| kJ | 85 | 53 | 53 | 41 | — | 30 | 29 | 19 | 33 | 51 | 60 | 91 | 81 | — | 73 | 70 | 68 | 68 | 68 | 68 | 48 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 144 | 266 | 266 | 266 | 266 | 131 | 131 | 266 | 270 | 342 | 570 | 292 | 300 | 251 | 251 | 251 | 353 | 419 | 54 | 572 | 286 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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