Surf Forecasts:
How big are the waves at Castlerock today (12 Sep):
- Morning surf: Morning surf (12 Sep, local time) - 4.5ft (1.4m), 12s period with NW swell.
- Afternoon surf: Afternoon surf (12 Sep, local time) - 5ft (1.6m), 13s period with NW swell.
- Evening surf: Evening surf (12 Sep, local time) - 4.5ft (1.4m), 12s period with NW swell.
The current surf forecast for Castlerock at 3AM is: 1.3m 13s primary swell from a Northwest direction and 0.8m 13s secondary swell from a Northwest direction (forecast issued at 12:00am September 12). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Sep) | 4.5ft (1.4m) | 12s |
| Afternoon (12 Sep) | 5ft (1.6m) | 13s |
| Evening (12 Sep) | 4.5ft (1.4m) | 12s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 15mm), heaviest on Fri night. Warm (max 20°C on Mon afternoon, min 11°C on Sat night). Winds decreasing (fresh winds from the SSW on Fri night, light winds from the SSW by Sat night). | ||||||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||||||||||
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 | 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 12 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | WNW 11 | WNW 9 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 553 | 545 | 581 | 666 | 699 | 865 | 741 | 565 | 442 | 427 | 298 | 258 | 220 | 167 | 136 | 113 | 87 | 65 | 50 | 38 | 36 | 18 | 23 | 26 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | cross-off | cross-off | cross-on | cross-on | cross | cross | cross | cross-off | off | off | off | cross-off | off | off | off | off | off | cross-off | off | off | cross-off |
High Tide | 7:21AM1.71m | 7:44PM2.04m | 7:53AM1.72m | 8:15PM1.93m | 8:23AM1.69m | 8:45PM1.78m | ||||||||||||||||||
Low Tide | 1:42AM0.04m | 1:33PM-0.05m | 2:11AM0.08m | 2:06PM-0.01m | 2:38AM0.15m | 2:39PM0.09m | ||||||||||||||||||
 | |  |  |  | |  |  |  | | |  | | | | |  | | | | | | | | |
 | — | 6:52 | — | — | — | — | — | — | — | 6:54 | — | — | — | — | — | — | — | 6:56 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 7:52 | — | — | — | — | — | — | — | 7:50 | — | — | — | — | — | — | — | 7:47 | — |
mm | 1 | 5 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — |
Temp °C | 13 | 14 | 16 | 17 | 17 | 15 | 14 | 13 | 12 | 12 | 11 | 12 | 15 | 18 | 18 | 16 | 15 | 15 | 16 | 16 | 19 | 20 | 17 | 17 |
Feels °C | 8 | 9 | 12 | 14 | 14 | 12 | 12 | 12 | 10 | 11 | 10 | 11 | 14 | 17 | 16 | 14 | 13 | 13 | 14 | 14 | 16 | 18 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 13 | NW 13 | NW 12 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | WNW 9 |
| kJ | 553 | 545 | 581 | 666 | 699 | 865 | 741 | 565 | 442 | 427 | 298 | 258 | 220 | 167 | 136 | 113 | 87 | 65 | 50 | 38 | 36 | 18 | 18 | 26 |
Swell 2 Height (m) Direction Period (s) | NW 13 | — | SE 4 | ESE 4 | — | — | — | — | — | — | — | — | — | N 16 | N 16 | N 15 | N 14 | N 14 | N 13 | N 13 | N 13 | N 13 | WNW 11 | WNW 11 |
| kJ | 242 | — | 4 | 2 | — | — | — | — | — | — | — | — | — | 5 | 5 | 17 | 15 | 14 | 32 | 14 | 30 | 13 | 23 | 23 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 3 | — | N 10 | N 9 | WNW 11 | N 12 | N 12 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 2 | 2 | 12 | 12 | 11 |
Wind waves Height (m) Direction Period (s) | SSE 2 | SSE 3 | SSE 4 | WSW 3 | WSW 3 | — | — | — | — | — | — | — | — | — | — | — | SSE 2 | — | — | — | — | SSE 2 | SSE 3 | — |
| kJ | 1 | 3 | 5 | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 387 | 27 | 9 | 387 | 251 | 27 | 9 | 9 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 8 | 14 | 8 | 390 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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