Surf Forecasts:
How big are the waves at Castlerock today (21 Oct):
- Morning surf: Morning surf (21 Oct, local time) - 5ft (1.6m), 12s period with NW swell.
- Afternoon surf: Afternoon surf (21 Oct, local time) - 10ft (3.0m), 10s period with NW swell.
- Evening surf: Evening surf (21 Oct, local time) - 6ft (1.8m), 13s period with NW swell.
The current surf forecast for Castlerock at 4PM is: 3.0m 10s primary swell from a Northwest direction (forecast issued at 12:00pm October 21). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Oct) | 5ft (1.6m) | 12s |
| Afternoon (21 Oct) | 10ft (3.0m) | 10s |
| Evening (21 Oct) | 6ft (1.8m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 29mm), heaviest during Wed morning. Very mild (max 11°C on Thu afternoon, min 7°C on Wed night). Winds decreasing (near gales from the WNW on Wed morning, calm by Thu night). | |||||||||||||||||||||
Wed 21 | Thursday 22 | Friday 23 | |||||||||||||||||||
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 11 | NW 10 | NW 10 | NW 9 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | WNW 11 | NW 11 | NW 13 | NW 12 | NW 13 | NW 13 | NW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 611 | 2011 | 1661 | 702 | 1521 | 1127 | 535 | 459 | 361 | 273 | 268 | 182 | 176 | 176 | 211 | 278 | 535 | 874 | 1266 | 1242 | 1346 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | glassy | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-on |
High Tide | 4:06PM1.45m | 4:20AM1.25m | 4:37PM1.60m | 4:53AM1.40m | 5:08PM1.74m | ||||||||||||||||
Low Tide | 9:38AM0.54m | 10:40PM0.49m | 10:22AM0.42m | 11:11PM0.35m | 10:59AM0.31m | ||||||||||||||||
 | | |  |  |  | | |  | | | | | |  | |  | |  | |  | |
 | 8:07 | — | — | — | — | — | — | 8:08 | — | — | — | — | — | — | — | 8:11 | — | — | — | — | — |
 | — | — | 6:14 | — | — | — | — | — | — | — | 6:12 | — | — | — | — | — | — | — | 6:09 | — | — |
mm | 7 | 6 | 7 | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 3 | 1 | — | — | 1 |
Temp °C | 10 | 8 | 9 | 9 | 8 | 8 | 7 | 7 | 8 | 10 | 11 | 9 | 8 | 8 | 9 | 7 | 8 | 10 | 10 | 9 | 10 |
Feels °C | 5 | -4 | 0 | 1 | 2 | 3 | 2 | 2 | 4 | 6 | 8 | 5 | 5 | 6 | 4 | 0 | 0 | 0 | 1 | 2 | 2 |
Swell 1 Height (m) Direction Period (s) | NW 11 | — | — | NW 13 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | WNW 11 | NW 11 | NW 13 | — | — | NW 13 | — |
| kJ | 611 | — | — | 609 | 1521 | 1127 | 535 | 459 | 361 | 273 | 268 | 182 | 176 | 176 | 211 | 278 | 535 | — | — | 1242 | — |
Swell 2 Height (m) Direction Period (s) | ESE 3 | — | — | — | — | — | NNW 7 | NNW 7 | NNW 7 | NW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | — | — | — | — | — |
| kJ | 2 | — | — | — | — | — | 104 | 86 | 68 | 49 | 32 | 25 | 15 | 9 | 4 | 4 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NW 10 | NW 10 | NW 9 | — | — | — | — | — | — | — | — | — | — | — | NW 4 | — | NW 12 | NW 13 | NW 7 | NW 13 |
| kJ | — | 2011 | 1661 | 702 | — | — | — | — | — | — | — | — | — | — | — | 8 | — | 874 | 1266 | 204 | 1346 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 71 | 273 | 172 | 162 | 27 | 27 | 9 | 0 | 0 | 0 | 2 | 0 | 0 | 66 | 71 | 342 | 328 | 328 | 398 | 414 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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