Surf Forecasts:
How big are the waves at Castlerock today (31 Jul):
- Morning surf: Morning surf (31 Jul, local time) - 1.5ft (0.4m), 6s period with NNW swell.
- Afternoon surf: Afternoon surf (31 Jul, local time) - 2ft (0.6m), 7s period with NW swell.
- Evening surf: Evening surf (31 Jul, local time) - 2ft (0.6m), 7s period with WNW swell.
The current surf forecast for Castlerock at 5PM is: 0.6m 7s primary swell from a West-northwest direction and 0.1m 8s secondary swell from a North direction (forecast issued at 06:00am July 31). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Jul) | 1.5ft (0.4m) | 6s |
| Afternoon (31 Jul) | 2ft (0.6m) | 7s |
| Evening (31 Jul) | 2ft (0.6m) | 7s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 6mm), mostly falling on Sun night. Very mild (max 17°C on Sun afternoon, min 11°C on Fri night). Wind will be generally light. | |||||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | |||||||||||||||||||||
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) | NNW 6 | NNW 6 | NNW 6 | NW 6 | NW 7 | WNW 7 | WNW 7 | NW 7 | WNW 7 | NW 6 | NW 6 | NW 6 | NW 7 | NW 7 | NW 7 | NW 6 | NW 7 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 37 | 22 | 15 | 11 | 35 | 32 | 31 | 22 | 29 | 33 | 42 | 61 | 63 | 63 | 43 | 41 | 54 | 60 | 60 | 63 | 50 | 36 | 35 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross | cross-off | cross-off | off | cross-off | cross | cross-on | cross | cross-off |
High Tide | 7:47AM1.57m | 8:17PM1.85m | 8:18AM1.57m | 8:48PM1.86m | 8:51AM1.56m | 9:20PM1.82m | |||||||||||||||||
Low Tide | 2:20AM0.29m | 2:09PM0.09m | 2:49AM0.28m | 2:36PM0.10m | 3:18AM0.30m | 3:03PM0.14m | |||||||||||||||||
 |  |  | |  |  |  | | | | | | | | |  | | | | | | | | |
 | 5:31 | — | — | — | — | — | — | — | 5:33 | — | — | — | — | — | — | — | 5:35 | — | — | — | — | — | — |
 | — | — | — | — | — | 9:32 | — | — | — | — | — | — | — | 9:30 | — | — | — | — | — | — | — | 9:29 | — |
mm | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 11 | 11 | 13 | 16 | 15 | 15 | 13 | 11 | 11 | 12 | 14 | 15 | 16 | 15 | 13 | 12 | 12 | 11 | 13 | 16 | 17 | 17 | 16 |
Feels °C | 8 | 8 | 9 | 12 | 10 | 11 | 10 | 8 | 8 | 9 | 10 | 10 | 11 | 12 | 11 | 11 | 11 | 10 | 12 | 14 | 16 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 6 | NW 6 | N 8 | NNW 6 | WNW 7 | NW 7 | WNW 7 | NW 6 | N 7 | N 8 | N 7 | N 7 | NW 7 | NW 6 | NW 7 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 |
| kJ | 37 | 22 | 15 | 11 | 1 | 3 | 31 | 22 | 29 | 33 | 1 | 1 | 1 | 1 | 43 | 41 | 54 | 60 | 60 | 63 | 50 | 36 | 35 |
Swell 2 Height (m) Direction Period (s) | W 7 | W 7 | WNW 7 | WNW 7 | — | N 8 | N 6 | N 7 | N 7 | N 7 | W 10 | — | — | — | N 9 | NNW 9 | NNW 9 | N 9 | NNW 9 | N 9 | N 9 | NNW 8 | NNW 8 |
| kJ | 4 | 4 | 5 | 5 | — | 1 | 1 | 1 | 1 | 1 | 2 | — | — | — | 2 | 8 | 8 | 6 | 8 | 7 | 6 | 14 | 14 |
Swell 3 Height (m) Direction Period (s) | — | — | N 8 | N 8 | — | — | N 8 | N 6 | — | W 10 | — | — | — | — | N 7 | — | — | — | — | — | — | — | — |
| kJ | — | — | 5 | 1 | — | — | 1 | 1 | — | 2 | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | WNW 3 | NW 7 | WNW 7 | — | — | — | — | NW 6 | NW 6 | NW 7 | NW 7 | — | — | — | — | — | — | — | ENE 2 | ENE 3 |
| kJ | — | — | — | 1 | 35 | 32 | — | — | — | — | 42 | 61 | 63 | 63 | — | — | — | — | — | — | — | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 42 | 42 | 54 | 576 | 414 | 873 | 187 | 172 | 185 | 162 | 391 | 409 | 409 | 187 | 27 | 14 | 0 | 0 | 0 | 2 | 8 | 8 | 8 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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