Surf Forecasts:
How big are the waves at Castlerock today (11 Sep):
- Afternoon surf: Afternoon surf (11 Sep, local time) - 3ft (0.9m), 8s period with NW swell.
- Evening surf: Evening surf (11 Sep, local time) - 2.5ft (0.7m), 12s period with NW swell.
The current surf forecast for Castlerock at 9PM is: 0.7m 12s primary swell from a Northwest direction and 0.9m 9s secondary swell from a Northwest direction (forecast issued at 06:00pm September 11). The wind direction is predicted to be offshore and the swell rating is 2.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Sep) | - | - |
| Afternoon (11 Sep) | 3ft (0.9m) | 8s |
| Evening (11 Sep) | 2.5ft (0.7m) | 12s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 13mm), heaviest on Fri night. Very mild (max 18°C on Sat morning, min 11°C on Sat night). Winds decreasing (fresh winds from the SSW on Fri night, light winds from the SW by Sun morning). | |||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | |||||||||||||||||
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 8 | NW 9 | NW 12 | 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 |
Wave Graph  | |||||||||||||||||||
 kJ | 118 | 132 | 164 | 553 | 609 | 581 | 677 | 772 | 790 | 741 | 565 | 442 | 427 | 298 | 293 | 220 | 196 | 136 | 133 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 7:11PM2.08m | 7:21AM1.71m | 7:44PM2.04m | 7:53AM1.72m | 8:15PM1.93m | ||||||||||||||
Low Tide | 1:42AM0.04m | 1:33PM-0.05m | 2:11AM0.08m | 2:06PM-0.01m | |||||||||||||||
 |  |  |  |  |  | |  | | |  |  | | | | | | | | |
 | — | — | — | — | 6:52 | — | — | — | — | — | — | — | 6:54 | — | — | — | — | — | — |
 | — | 7:54 | — | — | — | — | — | — | — | 7:52 | — | — | — | — | — | — | — | 7:50 | — |
mm | — | — | — | 1 | 9 | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 13 | 13 | 13 | 16 | 17 | 18 | 15 | 14 | 13 | 12 | 11 | 11 | 12 | 14 | 16 | 17 | 16 |
Feels °C | 13 | 13 | 9 | 8 | 8 | 12 | 14 | 15 | 12 | 12 | 11 | 11 | 9 | 10 | 11 | 13 | 15 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | NW 8 | NW 9 | NW 9 | 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 |
| kJ | 118 | 132 | 126 | 553 | 609 | 581 | 677 | 772 | 790 | 741 | 565 | 442 | 427 | 298 | 293 | 220 | 196 | 136 | 133 |
Swell 2 Height (m) Direction Period (s) | NW 11 | NW 12 | NW 12 | NW 13 | — | SE 4 | ESE 4 | — | — | — | — | — | — | — | — | — | — | N 16 | N 14 |
| kJ | 20 | 67 | 164 | 242 | — | 4 | 1 | — | — | — | — | — | — | — | — | — | — | 5 | 4 |
Swell 3 Height (m) Direction Period (s) | — | NW 16 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | SSE 2 | S 3 | S 4 | SW 3 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 1 | 4 | 6 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 8 | 0 | 0 | 0 | 0 | 387 | 387 | 9 | 187 | 71 | 131 | 131 | 27 | 9 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
Header Global | |||||||||||||||||||
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