Surf Forecasts:
How big are the waves at Castlerock today (15 Sep):
- Morning surf: Morning surf (15 Sep, local time) - 1.5ft (0.4m), 10s period with WNW swell.
- Afternoon surf: Afternoon surf (15 Sep, local time) - 3.5ft (1.1m), 5s period with NW swell.
- Evening surf: Evening surf (15 Sep, local time) - 4ft (1.2m), 6s period with NW swell.
The current surf forecast for Castlerock at 11AM is: 0.4m 10s primary swell from a West-northwest direction and 0.2m 9s secondary swell from a North direction, 0.5m 5s secondary swell from a West direction (forecast issued at 06:00am September 15). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Sep) | 1.5ft (0.4m) | 10s |
| Afternoon (15 Sep) | 3.5ft (1.1m) | 5s |
| Evening (15 Sep) | 4ft (1.2m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 9mm), mostly falling on Wed night. Very mild (max 15°C on Tue morning, min 12°C on Wed night). Winds increasing (moderate winds from the W on Wed morning, strong winds from the W by Thu afternoon). | |||||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||||||||
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) | WNW 9 | WNW 11 | WNW 10 | WNW 10 | NW 5 | NW 6 | NW 6 | NW 6 | NW 6 | WNW 11 | WNW 11 | NW 11 | NW 10 | NW 10 | NW 9 | WNW 9 | WNW 9 | WNW 10 | NW 10 | NW 12 | NW 13 | NW 15 | NW 15 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 115 | 44 | 40 | 154 | 64 | 82 | 102 | 109 | 113 | 115 | 186 | 286 | 192 | 139 | 118 | 199 | 261 | 349 | 582 | 1374 | 3385 | 5728 | 5224 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross |
High Tide | 8:53AM1.63m | 9:13PM1.60m | 9:24AM1.54m | 9:41PM1.41m | 9:56AM1.41m | ||||||||||||||||||
Low Tide | 3:04AM0.25m | 3:12PM0.22m | 3:29AM0.36m | 3:47PM0.38m | 3:55AM0.49m | 4:27PM0.56m | |||||||||||||||||
 |  |  |  |  | |  |  | |  |  | | | |  | | | | |  | | | | |
 | 6:58 | — | — | — | — | — | — | — | — | 7:00 | — | — | — | — | — | — | — | 7:01 | — | — | — | — | — |
 | — | — | — | — | — | 7:45 | — | — | — | — | — | — | — | 7:43 | — | — | — | — | — | — | — | 7:39 | — |
mm | — | — | — | 1 | 1 | — | — | — | — | 1 | — | — | — | — | 2 | 1 | — | — | — | 1 | 1 | 1 | — |
Temp °C | 14 | 13 | 15 | 15 | 15 | 14 | 13 | 13 | 13 | 13 | 13 | 15 | 15 | 14 | 14 | 13 | 12 | 12 | 13 | 13 | 13 | 12 | 12 |
Feels °C | 8 | 8 | 11 | 9 | 10 | 9 | 8 | 8 | 8 | 8 | 8 | 11 | 11 | 9 | 9 | 8 | 6 | 6 | 6 | 5 | 5 | 4 | 4 |
Swell 1 Height (m) Direction Period (s) | NW 11 | WNW 5 | WNW 10 | N 9 | N 9 | WNW 10 | WNW 10 | WNW 10 | WNW 12 | WNW 11 | WNW 11 | NW 11 | NW 10 | NW 10 | NW 9 | WNW 9 | WNW 9 | WNW 10 | NW 10 | NW 12 | — | NW 15 | NW 15 |
| kJ | 31 | 18 | 40 | 2 | 2 | 37 | 20 | 20 | 56 | 115 | 186 | 286 | 192 | 139 | 118 | 199 | 261 | 349 | 582 | 1374 | — | 5728 | 5224 |
Swell 2 Height (m) Direction Period (s) | N 11 | WNW 11 | N 9 | — | — | — | — | WNW 12 | — | — | — | — | — | — | N 9 | NNW 8 | N 8 | N 8 | — | — | — | — | — |
| kJ | 9 | 44 | 7 | — | — | — | — | 15 | — | — | — | — | — | — | 1 | 7 | 5 | 1 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | N 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 9 | SW 3 | W 5 | WNW 10 | NW 5 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | — | SW 2 | SW 3 | SW 3 | — | — | SSW 3 | WSW 4 | SW 3 | NW 13 | — | — |
| kJ | 115 | 2 | 12 | 154 | 64 | 82 | 102 | 109 | 113 | 91 | 47 | — | 1 | 2 | 3 | — | — | 1 | 10 | 3 | 3385 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 429 | 42 | 398 | 833 | 772 | 1035 | 339 | 413 | 334 | 71 | 150 | 283 | 9 | 323 | 292 | 332 | 340 | 330 | 341 | 1034 | 1034 | 772 | 629 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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