Surf Forecasts:
How big are the waves at Castlerock today (11 Sep):
- Morning surf: Morning surf (11 Sep, local time) - 2.5ft (0.8m), 7s period with NW swell.
- 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 3AM is: 0.8m 6s primary swell from a West-northwest direction and 0.3m 11s secondary swell from a West-northwest direction, 0.3m 12s secondary swell from a West-northwest direction (forecast issued at 12:00am September 11). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Sep) | 2.5ft (0.8m) | 7s |
| 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 ForecastLight rain (total 9mm), mostly falling on Fri night. Very mild (max 19°C on Sat morning, min 12°C on Thu night). Winds decreasing (fresh winds from the S on Fri night, calm by Sat night). | ||||||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||||||||||
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) | WNW 12 | WNW 6 | NW 6 | NW 7 | NW 8 | NW 8 | NW 9 | NW 12 | NW 13 | NW 13 | NW 13 | NW 13 | 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 | 27 | 44 | 52 | 55 | 115 | 118 | 132 | 193 | 618 | 609 | 581 | 688 | 777 | 851 | 656 | 565 | 442 | 383 | 298 | 258 | 216 | 167 | 136 | 115 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-off | off | off | off | off | off | cross-off | cross | cross-on | on | cross-on | cross | cross-on | glassy | glassy | glassy | glassy | off | off |
High Tide | 6:48AM1.67m | 7:11PM2.08m | 7:21AM1.71m | 7:44PM2.04m | 7:53AM1.72m | 8:15PM1.93m | ||||||||||||||||||
Low Tide | 1:11AM0.05m | 12:59PM-0.04m | 1:42AM0.04m | 1:33PM-0.05m | 2:11AM0.08m | 2:06PM-0.01m | ||||||||||||||||||
 |  |  | | |  |  |  |  | |  | | | | | | | | | | | | | | |
 | — | 6:50 | — | — | — | — | — | — | — | 6:52 | — | — | — | — | — | — | — | 6:54 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 7:54 | — | — | — | — | — | — | — | 7:52 | — | — | — | — | — | — | — | 7:50 | — |
mm | — | — | — | — | — | — | — | — | 3 | 4 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 13 | 12 | 14 | 15 | 16 | 16 | 13 | 12 | 14 | 15 | 18 | 19 | 16 | 14 | 14 | 14 | 13 | 12 | 13 | 16 | 17 | 18 | 17 |
Feels °C | 10 | 9 | 8 | 11 | 11 | 13 | 13 | 9 | 6 | 9 | 12 | 16 | 17 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 16 | 17 | 17 | 16 |
Swell 1 Height (m) Direction Period (s) | WNW 6 | WNW 11 | WNW 10 | NW 7 | NW 8 | NW 8 | NW 9 | NW 9 | NW 13 | NW 13 | NW 13 | NW 13 | 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 | 22 | 22 | 10 | 55 | 115 | 118 | 132 | 110 | 618 | 609 | 581 | 688 | 777 | 851 | 656 | 565 | 442 | 383 | 298 | 258 | 216 | 167 | 136 | 115 |
Swell 2 Height (m) Direction Period (s) | WNW 12 | — | — | WNW 8 | — | NW 11 | NW 12 | NW 12 | NW 13 | — | — | SE 4 | — | — | — | — | — | — | — | — | — | N 16 | N 15 | N 14 |
| kJ | 27 | — | — | 28 | — | 20 | 67 | 193 | 242 | — | — | 3 | — | — | — | — | — | — | — | — | — | 5 | 17 | 15 |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 10 | — | — | NW 16 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 8 | — | — | 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 4 | WNW 6 | NW 6 | — | — | — | — | — | SSE 2 | SSE 3 | SSE 4 | SSE 4 | WSW 3 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 7 | 44 | 52 | — | — | — | — | — | 1 | 3 | 5 | 3 | 2 | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 300 | 300 | 336 | 162 | 9 | 0 | 0 | 0 | 387 | 387 | 0 | 9 | 187 | 42 | 71 | 27 | 9 | 9 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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