Surf Forecasts:
How big are the waves at Castlerock today (19 Aug):
- Morning surf: Morning surf (19 Aug, local time) - 3ft (0.9m), 10s period with WNW swell.
- Afternoon surf: Afternoon surf (19 Aug, local time) - 3ft (0.9m), 10s period with WNW swell.
- Evening surf: Evening surf (19 Aug, local time) - 2.5ft (0.8m), 10s period with WNW swell.
The current surf forecast for Castlerock at 6PM is: 0.8m 10s primary swell from a West-northwest direction (forecast issued at 12:00pm August 19). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 Aug) | 3ft (0.9m) | 10s |
| Afternoon (19 Aug) | 3ft (0.9m) | 10s |
| Evening (19 Aug) | 2.5ft (0.8m) | 10s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 10mm), heaviest on Wed morning. Very mild (max 16°C on Wed afternoon, min 12°C on Thu night). Winds increasing (light winds from the N on Wed night, fresh winds from the NNW by Thu afternoon). | |||||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | |||||||||||||||||||
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) | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | N 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 171 | 168 | 151 | 122 | 122 | 85 | 85 | 140 | 226 | 294 | 277 | 239 | 206 | 247 | 268 | 226 | 155 | 108 | 97 | 74 | 51 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on |
High Tide | 10:38AM1.33m | 11:03PM1.28m | 11:24AM1.21m | 11:54PM1.10m | 1:03PM1.11m | ||||||||||||||||
Low Tide | 5:08PM0.52m | 5:35AM0.63m | 6:11PM0.68m | 6:42AM0.72m | 8:03PM0.77m | ||||||||||||||||
 |  |  | |  |  |  | |  |  | | |  | | |  | | | | | | |
 | 6:07 | — | — | — | — | — | 6:09 | — | — | — | — | — | — | — | 6:11 | — | — | — | — | — | — |
 | — | — | — | 8:52 | — | — | — | — | — | — | — | 8:50 | — | — | — | — | — | — | — | 8:47 | — |
mm | 2 | 1 | 2 | 2 | 1 | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 15 | 16 | 15 | 14 | 13 | 13 | 13 | 13 | 14 | 13 | 13 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 |
Feels °C | 10 | 13 | 14 | 14 | 13 | 11 | 10 | 10 | 9 | 8 | 6 | 7 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 8 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NNW 8 | NNW 8 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | — | — | WNW 8 | WNW 8 | WNW 8 | — | W 8 | W 8 |
| kJ | 171 | 168 | 151 | 122 | 122 | 85 | 85 | 140 | 226 | 19 | 18 | 17 | 16 | — | — | 7 | 7 | 6 | — | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | N 9 | WNW 10 | WNW 10 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 2 | 55 | 33 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | N 4 | NE 3 | — | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | N 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 |
| kJ | — | — | — | — | — | — | 4 | 3 | — | 294 | 277 | 239 | 206 | 247 | 268 | 226 | 155 | 108 | 97 | 74 | 51 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 9 | 63 | 66 | 74 | 66 | 438 | 408 | 1084 | 339 | 342 | 342 | 303 | 303 | 266 | 342 | 266 | 270 | 266 | 273 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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