Surf Forecasts:
How big are the waves at Castlerock today (20 Oct):
- Morning surf: Morning surf (20 Oct, local time) - 4ft (1.2m), 13s period with NW swell.
- Afternoon surf: Afternoon surf (20 Oct, local time) - 3.5ft (1.1m), 13s period with NW swell.
- Evening surf: Evening surf (20 Oct, local time) - 3.5ft (1.1m), 13s period with NW swell.
The current surf forecast for Castlerock at 6PM is: 1.1m 13s primary swell from a Northwest direction (forecast issued at 12:00pm October 20). An open ocean swell of 0.5m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Oct) | 4ft (1.2m) | 13s |
| Afternoon (20 Oct) | 3.5ft (1.1m) | 13s |
| Evening (20 Oct) | 3.5ft (1.1m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 23mm), heaviest during Thu night. Very mild (max 13°C on Tue afternoon, min 7°C on Wed night). Winds decreasing (strong winds from the WNW on Wed morning, calm by Thu night). | |||||||||||||||||||||
Tue 20 | Wednesday 21 | Thursday 22 | |||||||||||||||||||
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 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 10 | NW 10 | NW 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | WNW 11 | WNW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 503 | 386 | 380 | 392 | 386 | 374 | 444 | 678 | 713 | 1690 | 1088 | 2154 | 1306 | 1037 | 865 | 519 | 361 | 273 | 268 | 215 | 207 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off |
High Tide | 3:28PM1.30m | 3:42AM1.11m | 4:06PM1.45m | 4:20AM1.25m | 4:37PM1.60m | ||||||||||||||||
Low Tide | 8:34AM0.65m | 10:01PM0.64m | 9:38AM0.54m | 10:40PM0.49m | 10:22AM0.42m | ||||||||||||||||
 |  | |  |  | | |  |  | | | | | | | |  | | |  | | |
 | 8:04 | — | — | — | — | — | — | 8:07 | — | — | — | — | — | — | — | 8:08 | — | — | — | — | — |
 | — | — | 6:16 | — | — | — | — | — | — | — | 6:14 | — | — | — | — | — | — | — | 6:12 | — | — |
mm | — | — | — | — | — | — | — | 1 | 3 | 4 | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 10 | 12 | 13 | 11 | 9 | 9 | 10 | 10 | 9 | 8 | 10 | 9 | 8 | 7 | 7 | 7 | 9 | 11 | 11 | 9 | 9 |
Feels °C | 4 | 6 | 8 | 6 | 5 | 5 | 7 | 8 | 5 | -2 | 2 | 2 | 3 | 2 | 3 | 3 | 5 | 7 | 7 | 5 | 6 |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | — | NW 14 | NW 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | WNW 11 | WNW 11 |
| kJ | 503 | 386 | 380 | 392 | 386 | 374 | 444 | 678 | 713 | — | 350 | 1834 | 1306 | 1037 | 865 | 519 | 361 | 273 | 268 | 215 | 207 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 75 | 51 | 33 | 36 | 21 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 3 | SE 4 | SE 3 | SE 3 | SE 3 | — | — | — | — | NW 10 | NW 10 | NW 13 | — | — | — | — | — | — | — | — | — |
| kJ | 5 | 8 | 5 | 5 | 2 | — | — | — | — | 1690 | 1088 | 2154 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 16 | 2 | 2 | 2 | 0 | 0 | 0 | 9 | 282 | 273 | 162 | 27 | 9 | 0 | 0 | 0 | 9 | 0 | 2 | 0 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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