Surf Forecasts:
How big are the waves at Castlerock today (17 Jul):
- Morning surf: Morning surf (17 Jul, local time) - 2.5ft (0.8m), 5s period with NNW swell.
- Afternoon surf: Afternoon surf (17 Jul, local time) - 3.5ft (1.1m), 6s period with NNW swell.
- Evening surf: Evening surf (17 Jul, local time) - 4.5ft (1.3m), 6s period with NNW swell.
The current surf forecast for Castlerock at 7PM is: 1.3m 6s primary swell from a North-northwest direction and 0.3m 10s secondary swell from a Northwest direction (forecast issued at 12:00pm July 17). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Jul) | 2.5ft (0.8m) | 5s |
| Afternoon (17 Jul) | 3.5ft (1.1m) | 6s |
| Evening (17 Jul) | 4.5ft (1.3m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 14°C on Fri afternoon, min 12°C on Fri night). Wind will be generally light. | |||||||||||||||||||||
Fri 17 | Saturday 18 | Sunday 19 | |||||||||||||||||||
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 | NNW 6 | NNW 7 | 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 7 | NNW 7 | NNW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 45 | 82 | 103 | 125 | 152 | 110 | 155 | 108 | 83 | 69 | 71 | 78 | 68 | 93 | 85 | 85 | 73 | 54 | 41 | 41 | 30 |
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-on | cross-on | cross-on | 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 | 8:45AM1.55m | 9:18PM2.00m | 9:25AM1.48m | 10:00PM1.89m | 10:04AM1.39m | ||||||||||||||||
Low Tide | 3:00PM0.02m | 3:59AM0.22m | 3:40PM0.08m | 4:40AM0.32m | 4:21PM0.19m | ||||||||||||||||
 |  |  | |  | |  | | | | | |  | | | | | | | | | |
 | 5:09 | — | — | — | — | — | 5:09 | — | — | — | — | — | — | — | 5:11 | — | — | — | — | — | — |
 | — | — | — | 9:55 | — | — | — | — | — | — | — | 9:53 | — | — | — | — | — | — | — | 9:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 13 | 14 | 13 | 13 | 12 | 12 | 13 | 12 | 13 | 13 | 13 | 13 | 12 | 12 | 13 | 14 | 14 | 14 | 14 |
Feels °C | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 9 | 7 | 9 | 9 | 11 | 11 | 10 | 10 | 10 | 11 | 11 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NNE 6 | NW 8 | NW 8 | NW 8 | NW 8 | WNW 8 | NW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NW 9 | NW 12 | NW 12 | NW 12 | NW 12 |
| kJ | 17 | 16 | 15 | 14 | 20 | 68 | 18 | 16 | 16 | 9 | 6 | 14 | 68 | 93 | 85 | 85 | 3 | 6 | 5 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | NW 9 | — | — | — | — | — | — | — | W 14 | NW 13 | W 9 | NW 12 | W 9 | W 8 | NW 8 | W 8 |
| kJ | — | — | — | — | — | 19 | — | — | — | — | — | — | — | 4 | 7 | 2 | 6 | 2 | 1 | 3 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 13 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | — | — | — | — | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 |
| kJ | 45 | 82 | 103 | 125 | 152 | 110 | 155 | 108 | 83 | 69 | 71 | 78 | — | — | — | — | 73 | 54 | 41 | 41 | 30 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 382 | 382 | 398 | 707 | 300 | 292 | 292 | 270 | 342 | 266 | 266 | 334 | 266 | 97 | 27 | 110 | 131 | 266 | 266 | 266 | 131 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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