Surf Forecasts:
How big are the waves at Castlerock today (18 Jul):
- Morning surf: Morning surf (18 Jul, local time) - 4.5ft (1.3m), 6s period with NNW swell.
- Afternoon surf: Afternoon surf (18 Jul, local time) - 3.5ft (1.0m), 6s period with NNW swell.
- Evening surf: Evening surf (18 Jul, local time) - 3.5ft (1.1m), 6s period with NNW swell.
The current surf forecast for Castlerock at 9AM is: 1.3m 6s primary swell from a North-northwest direction and 0.3m 8s secondary swell from a Northwest direction (forecast issued at 12:00am July 18). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Jul) | 4.5ft (1.3m) | 6s |
| Afternoon (18 Jul) | 3.5ft (1.0m) | 6s |
| Evening (18 Jul) | 3.5ft (1.1m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 14°C on Sun morning, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | ||||||||||||||||||||||
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 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 4 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 6 | NNW 7 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 153 | 170 | 130 | 90 | 69 | 66 | 75 | 104 | 107 | 117 | 96 | 66 | 64 | 53 | 41 | 40 | 40 | 17 | 25 | 28 | 39 | 40 | 53 | 62 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:25AM1.48m | 10:00PM1.89m | 10:04AM1.39m | 10:43PM1.72m | 10:47AM1.31m | |||||||||||||||||||
Low Tide | 3:59AM0.22m | 3:40PM0.08m | 4:40AM0.32m | 4:21PM0.19m | 5:22AM0.43m | 5:06PM0.33m | ||||||||||||||||||
 |  |  |  | |  | |  | | | | | | | | | | | | | | | | | |
 | — | 5:09 | — | — | — | — | — | — | — | 5:11 | — | — | — | — | — | — | — | 5:13 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:53 | — | — | — | — | — | — | — | 9:52 | — | — | — | — | — | — | — | 9:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 12 | 12 | 12 | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 |
Feels °C | 8 | 7 | 7 | 7 | 7 | 9 | 9 | 10 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 11 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | N 6 | — | NW 8 | NW 8 | NW 8 | WNW 8 | NW 7 | NNW 6 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 11 | WNW 11 | WNW 10 |
| kJ | 39 | — | 16 | 11 | 9 | 6 | 14 | 104 | 107 | 117 | 96 | 66 | 6 | 5 | 5 | 5 | 5 | 5 | 12 | 11 | 11 | 11 | 11 | 10 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 14 | NW 13 | NW 13 | NW 12 | W 9 | W 9 | W 9 | W 8 | W 9 | W 8 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 4 | 7 | 6 | 6 | 2 | 1 | 1 | 1 | 1 | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 9 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | — | — | NNW 7 | — | — | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 4 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 6 | NNW 7 |
| kJ | 153 | 170 | 130 | 90 | 69 | 66 | 75 | — | — | 116 | — | — | 64 | 53 | 41 | 40 | 40 | 17 | 25 | 28 | 39 | 40 | 53 | 62 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 252 | 313 | 270 | 342 | 266 | 266 | 266 | 266 | 107 | 76 | 131 | 131 | 54 | 266 | 266 | 131 | 131 | 131 | 266 | 270 | 342 | 300 | 399 | 300 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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