Surf Forecasts:
How big are the waves at Castlerock today (13 Sep):
- Morning surf: Morning surf (13 Sep, local time) - 3.5ft (1.1m), 11s period with NW swell.
- Afternoon surf: Afternoon surf (13 Sep, local time) - 3.5ft (1.0m), 10s period with NW swell.
- Evening surf: Evening surf (13 Sep, local time) - 2.5ft (0.8m), 10s period with NW swell.
The current surf forecast for Castlerock at 12PM is: 1.1m 11s primary swell from a Northwest direction (forecast issued at 06:00am September 13). The wind direction is predicted to be glassy and the swell rating is 2.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Sep) | 3.5ft (1.1m) | 11s |
| Afternoon (13 Sep) | 3.5ft (1.0m) | 10s |
| Evening (13 Sep) | 2.5ft (0.8m) | 10s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 18mm), heaviest on Mon afternoon. Very mild (max 19°C on Mon morning, min 12°C on Tue night). Winds increasing (calm on Sun morning, fresh winds from the NW by Tue night). | |||||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||||||||
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 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | WNW 8 | WNW 11 | WNW 10 | WNW 10 | W 9 | WNW 11 | WNW 10 | WNW 10 | NW 6 | NW 6 | NW 6 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 427 | 298 | 293 | 220 | 192 | 136 | 113 | 87 | 65 | 50 | 38 | 35 | 28 | 65 | 59 | 56 | 81 | 45 | 40 | 39 | 44 | 80 | 141 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | off | glassy | glassy | cross-off | off | off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on |
High Tide | 7:53AM1.72m | 8:15PM1.93m | 8:23AM1.69m | 8:45PM1.78m | 8:53AM1.63m | 9:13PM1.60m | |||||||||||||||||
Low Tide | 2:11AM0.08m | 2:06PM-0.01m | 2:38AM0.15m | 2:39PM0.09m | 3:04AM0.25m | 3:12PM0.22m | |||||||||||||||||
 |  |  |  | | |  | |  | | | |  |  | | | | | |  | | |  | |
 | 6:54 | — | — | — | — | — | — | — | 6:56 | — | — | — | — | — | — | — | 6:58 | — | — | — | — | — | — |
 | — | — | — | — | — | 7:50 | — | — | — | — | — | — | — | 7:47 | — | — | — | — | — | — | — | 7:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 5 | — | — | — | — | — | 1 | — | 1 | 1 |
Temp °C | 13 | 13 | 13 | 15 | 17 | 18 | 17 | 15 | 14 | 16 | 16 | 19 | 17 | 17 | 17 | 15 | 13 | 14 | 14 | 13 | 14 | 13 | 13 |
Feels °C | 12 | 13 | 12 | 15 | 17 | 17 | 16 | 13 | 12 | 14 | 13 | 16 | 16 | 16 | 14 | 10 | 9 | 10 | 10 | 7 | 8 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | NW 12 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | WNW 8 | WNW 11 | WNW 10 | WNW 10 | WNW 11 | WNW 5 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | — |
| kJ | 427 | 298 | 293 | 220 | 192 | 136 | 113 | 87 | 65 | 50 | 38 | 35 | 28 | 65 | 59 | 56 | 23 | 9 | 40 | 39 | 38 | 37 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | N 16 | — | N 14 | N 14 | N 13 | N 13 | N 13 | N 13 | N 13 | N 12 | N 12 | N 12 | N 11 | WNW 11 | N 10 | N 9 | N 9 | N 9 | — |
| kJ | — | — | — | — | 5 | — | 4 | 14 | 14 | 32 | 14 | 13 | 13 | 12 | 11 | 11 | 9 | 45 | 8 | 7 | 2 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | N 10 | N 9 | N 9 | N 9 | — | — | — | N 10 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 2 | 2 | — | — | — | 8 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | ESE 2 | ESE 3 | — | — | SSE 2 | SSE 2 | — | — | S 2 | W 9 | SW 2 | W 5 | WNW 4 | NW 6 | NW 6 | NW 6 |
| kJ | — | — | — | — | — | — | — | 1 | 1 | — | — | 1 | 1 | — | — | 1 | 81 | 1 | 12 | 24 | 44 | 80 | 141 |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 8 | 14 | 0 | 0 | 187 | 9 | 9 | 772 | 380 | 862 | 443 | 413 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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