Surf Forecasts:
How big are the waves at Castlerock today (21 Jul):
- Morning surf: Morning surf (21 Jul, local time) - 3.5ft (1.0m), 6s period with NNW swell.
- Afternoon surf: Afternoon surf (21 Jul, local time) - 3.5ft (1.1m), 6s period with NNW swell.
- Evening surf: Evening surf (21 Jul, local time) - 3.5ft (1.1m), 6s period with NNW swell.
The current surf forecast for Castlerock at 10AM is: 1.0m 6s primary swell from a North-northwest direction and 0.2m 10s secondary swell from a West-northwest direction (forecast issued at 06:00am July 21). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Jul) | 3.5ft (1.0m) | 6s |
| Afternoon (21 Jul) | 3.5ft (1.1m) | 6s |
| Evening (21 Jul) | 3.5ft (1.1m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 17°C on Thu afternoon, min 11°C on Tue morning). Wind will be generally light. | |||||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||||||||
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 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NW 7 | NNW 7 | NNW 7 | NNW 7 | NW 7 | NW 6 | NW 6 | NW 6 | NW 6 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 73 | 64 | 68 | 77 | 74 | 71 | 74 | 82 | 73 | 85 | 77 | 79 | 62 | 61 | 47 | 40 | 30 | 29 | 21 | 20 | 19 | 19 | 19 |
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 | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 11:36AM1.22m | 00:19AM1.35m | 12:45PM1.16m | 1:32AM1.21m | 2:27PM1.15m | ||||||||||||||||||
Low Tide | 6:05AM0.53m | 5:58PM0.49m | 6:55AM0.61m | 7:05PM0.62m | 8:00AM0.66m | 8:37PM0.69m | |||||||||||||||||
 |  |  | | | | |  | | | | | | | | | | | |  | | |  | |
 | 5:15 | — | — | — | — | — | — | — | 5:16 | — | — | — | — | — | — | — | 5:18 | — | — | — | — | — | — |
 | — | — | — | — | — | 9:50 | — | — | — | — | — | — | — | 9:49 | — | — | — | — | — | — | — | 9:46 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 11 | 12 | 12 | 12 | 11 | 12 | 12 | 12 | 13 | 14 | 15 | 15 | 14 | 13 | 14 | 14 | 14 | 16 | 17 | 16 | 14 |
Feels °C | 9 | 9 | 7 | 7 | 7 | 7 | 6 | 8 | 9 | 9 | 10 | 11 | 13 | 12 | 12 | 11 | 12 | 12 | 12 | 14 | 14 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | NW 9 | NW 9 | W 9 | W 9 | W 9 | W 9 | W 9 | W 9 | NNW 7 | NNW 7 | NNW 7 | NW 7 | NW 6 | W 9 | NW 8 | NW 6 |
| kJ | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 40 | 30 | 29 | 21 | 20 | 2 | 3 | 19 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 9 | W 9 | W 9 | W 8 | W 8 | — | — | NW 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 2 | 1 | 1 | — | — | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NW 7 | — | — | — | — | — | NW 6 | NW 6 | — |
| kJ | 73 | 64 | 68 | 77 | 74 | 71 | 74 | 82 | 73 | 85 | 77 | 79 | 62 | 61 | 47 | — | — | — | — | — | 19 | 19 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 353 | 353 | 385 | 1263 | 1263 | 286 | 286 | 286 | 286 | 286 | 54 | 131 | 1292 | 54 | 54 | 42 | 42 | 42 | 42 | 87 | 403 | 403 | 187 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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