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) - 1.5ft (0.5m), 6s period with NW swell.
- Evening surf: Evening surf (31 Jul, local time) - 2ft (0.6m), 7s period with NW swell.
The current surf forecast for Castlerock at 5AM is: 0.6m 6s primary swell from a North-northwest direction and 0.2m 7s secondary swell from a West direction (forecast issued at 12:00am July 31). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Jul) | 1.5ft (0.4m) | 6s |
| Afternoon (31 Jul) | 1.5ft (0.5m) | 6s |
| Evening (31 Jul) | 2ft (0.6m) | 7s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 2mm), mostly falling on Fri morning. Very mild (max 17°C on Sun afternoon, min 11°C on Thu night). Wind will be generally light. | ||||||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||||||||||
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) | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NW 6 | WNW 5 | NW 5 | NW 7 | WNW 7 | WNW 7 | NW 7 | NW 6 | NW 6 | NW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 61 | 28 | 22 | 15 | 15 | 11 | 13 | 35 | 30 | 29 | 35 | 39 | 59 | 88 | 75 | 63 | 44 | 47 | 52 | 57 | 57 | 45 | 45 | 34 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross | cross-off | cross-off | off | glassy | cross-on | cross-on | cross-on | cross |
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 | 11 | 13 | 16 | 15 | 15 | 13 | 11 | 11 | 11 | 14 | 15 | 16 | 15 | 13 | 12 | 12 | 11 | 13 | 15 | 15 | 17 | 16 |
Feels °C | 9 | 8 | 8 | 9 | 12 | 10 | 11 | 10 | 8 | 8 | 8 | 10 | 10 | 11 | 11 | 11 | 10 | 11 | 10 | 12 | 14 | 13 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | NNW 7 | NNW 6 | NNW 6 | NNW 6 | WNW 7 | WNW 7 | WNW 7 | NW 7 | WNW 7 | WNW 7 | NW 7 | N 7 | N 7 | — | — | NW 7 | NW 7 | NW 7 | NW 7 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 |
| kJ | 61 | 28 | 22 | 15 | 5 | 5 | 9 | 35 | 30 | 29 | 35 | 1 | 1 | — | — | 63 | 44 | 47 | 52 | 57 | 57 | 45 | 45 | 34 |
Swell 2 Height (m) Direction Period (s) | — | W 7 | W 7 | WNW 7 | N 8 | NNW 6 | N 6 | N 8 | N 7 | N 7 | N 7 | W 10 | — | — | — | N 9 | N 9 | NNW 9 | NNW 9 | NNW 9 | NNW 9 | NNW 9 | NNW 8 | NNW 8 |
| kJ | — | 4 | 4 | 5 | 1 | 3 | 3 | 1 | 1 | 1 | 1 | 2 | — | — | — | 6 | 6 | 8 | 7 | 8 | 16 | 16 | 14 | 14 |
Swell 3 Height (m) Direction Period (s) | — | — | — | N 8 | — | N 8 | N 8 | — | — | — | W 10 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 5 | — | 1 | 1 | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 6 | WNW 5 | NW 5 | — | — | — | — | NW 6 | NW 6 | NW 7 | NW 7 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 15 | 11 | 13 | — | — | — | — | 39 | 59 | 88 | 75 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 42 | 42 | 42 | 1338 | 444 | 440 | 27 | 27 | 27 | 162 | 409 | 409 | 409 | 576 | 9 | 8 | 8 | 8 | 0 | 2 | 16 | 8 | 16 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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