Surf Forecasts:
How big are the waves at Castlerock today (09 Sep):
- Afternoon surf: Afternoon surf (09 Sep, local time) - 8ft (2.5m), 10s period with NW swell.
- Evening surf: Evening surf (09 Sep, local time) - 8ft (2.5m), 10s period with NNW swell.
The current surf forecast for Castlerock at 12AM is: 2.5m 10s primary swell from a North-northwest direction (forecast issued at 06:00pm September 08). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (09 Sep) | - | - |
| Afternoon (09 Sep) | 8ft (2.5m) | 10s |
| Evening (09 Sep) | 8ft (2.5m) | 10s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Very mild (max 17°C on Thu afternoon, min 11°C on Tue night). Winds decreasing (strong winds from the NW on Tue afternoon, light winds from the SSW by Wed afternoon). | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | |||||||||||||||||
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 10 | NW 11 | NNW 10 | NNW 10 | NNW 10 | NNW 9 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NW 8 | NW 7 | NW 7 | WNW 7 | WNW 9 | WNW 11 | W 8 | WNW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 1433 | 1729 | 1538 | 1147 | 908 | 572 | 346 | 233 | 96 | 56 | 35 | 28 | 27 | 26 | 21 | 30 | 24 | 90 | 58 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | off | off | off | off | off | off | cross-off | cross-off | cross-off |
High Tide | 5:16PM1.76m | 5:36AM1.49m | 5:58PM1.94m | 6:13AM1.60m | 6:36PM2.05m | ||||||||||||||
Low Tide | 11:58PM0.22m | 11:48AM0.16m | 00:37AM0.11m | 12:25PM0.03m | |||||||||||||||
 |  |  |  | | | |  |  | | | | | | |  | | |  | |
 | — | — | — | — | 6:46 | — | — | — | — | — | — | — | 6:48 | — | — | — | — | — | — |
 | — | 8:02 | — | — | — | — | — | — | — | 8:00 | — | — | — | — | — | — | — | 7:58 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 14 | 13 | 13 | 13 | 13 | 11 | 13 | 15 | 15 | 14 | 13 | 12 | 12 | 12 | 14 | 15 | 17 | 16 | 14 |
Feels °C | 6 | 5 | 5 | 6 | 6 | 7 | 10 | 12 | 12 | 12 | 10 | 8 | 8 | 7 | 9 | 11 | 13 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | NNW 9 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NW 8 | NW 7 | NW 7 | WNW 7 | WNW 9 | WNW 8 | WNW 11 | WNW 8 |
| kJ | — | — | — | — | — | 572 | 346 | 233 | 96 | 56 | 35 | 28 | 27 | 26 | 21 | 30 | 24 | 25 | 58 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | WNW 9 | WNW 8 | WNW 8 | WNW 8 | NNW 7 | NNW 7 | NNW 7 | N 7 | SE 4 | WNW 11 | SE 4 | WNW 12 |
| kJ | — | — | — | — | — | — | — | 68 | 46 | 45 | 12 | 18 | 5 | 5 | 1 | 4 | 23 | 1 | 27 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NW 8 | — | W 12 | W 12 | — | N 7 | SE 4 | E 6 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 15 | — | 3 | 3 | — | 1 | 2 | 1 | — |
Wind waves Height (m) Direction Period (s) | NW 10 | NW 11 | NNW 10 | NNW 10 | NNW 10 | — | — | — | — | — | — | — | — | SE 2 | SSE 3 | S 3 | SW 3 | W 8 | SW 3 |
| kJ | 1433 | 1729 | 1538 | 1147 | 908 | — | — | — | — | — | — | — | — | 1 | 7 | 3 | 2 | 90 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1298 | 862 | 772 | 587 | 187 | 52 | 9 | 9 | 9 | 0 | 0 | 14 | 67 | 194 | 194 | 391 | 398 | 254 | 364 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
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