Surf Forecasts:
How big are the waves at Castlerock today (20 Sep):
- Morning surf: Morning surf (20 Sep, local time) - 7ft (2.1m), 11s period with NW swell.
- Afternoon surf: Afternoon surf (20 Sep, local time) - 6ft (1.8m), 11s period with NW swell.
- Evening surf: Evening surf (20 Sep, local time) - 5ft (1.6m), 11s period with NW swell.
The current surf forecast for Castlerock at 1PM is: 1.9m 11s primary swell from a Northwest direction (forecast issued at 06:00am September 20). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Sep) | 7ft (2.1m) | 11s |
| Afternoon (20 Sep) | 6ft (1.8m) | 11s |
| Evening (20 Sep) | 5ft (1.6m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 16mm), heaviest on Tue night. Warm (max 22°C on Mon afternoon, min 10°C on Tue night). Winds decreasing (fresh winds from the WNW on Sun morning, light winds from the NNW by Tue night). | |||||||||||||||||||||||
Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||||||||
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) | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 12 | NW 13 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 15 | WNW 14 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 1521 | 1372 | 1132 | 866 | 729 | 564 | 583 | 653 | 481 | 361 | 309 | 255 | 202 | 140 | 117 | 115 | 106 | 64 | 123 | 90 | 58 | 223 | 362 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-on | cross-on | on | on |
High Tide | 3:29PM1.15m | 3:56AM1.03m | 4:25PM1.30m | 4:33AM1.16m | 4:57PM1.46m | ||||||||||||||||||
Low Tide | 7:54AM0.76m | 9:57PM0.75m | 9:43AM0.65m | 10:51PM0.62m | 10:35AM0.50m | ||||||||||||||||||
 | |  |  | |  |  | |  | | | | | | | | | | |  | | |  | |
 | — | 7:07 | — | — | — | — | — | — | — | 7:09 | — | — | — | — | — | — | — | 7:11 | — | — | — | — | — |
 | — | — | — | — | — | 7:31 | — | — | — | — | — | — | — | 7:30 | — | — | — | — | — | — | — | 7:27 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 1 |
Temp °C | 12 | 12 | 13 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 16 | 20 | 22 | 21 | 19 | 17 | 17 | 16 | 15 | 12 | 12 | 12 | 11 |
Feels °C | 5 | 5 | 7 | 9 | 10 | 11 | 10 | 9 | 9 | 12 | 15 | 19 | 21 | 21 | 18 | 15 | 15 | 14 | 14 | 10 | 11 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | — | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 12 | NW 13 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 15 | WNW 14 |
| kJ | — | 1372 | 1132 | 866 | 729 | 564 | 583 | 653 | 481 | 361 | 309 | 255 | 202 | 140 | 117 | 115 | 106 | 64 | 123 | 90 | 58 | 223 | 362 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WNW 12 | — | NW 20 | WNW 18 | WNW 9 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 56 | — | 15 | 32 | 8 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 12 | — | — | — | — | — | — | — | — | S 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1521 | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 387 | 339 | 353 | 162 | 162 | 9 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 42 | 27 | 71 | 27 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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