Surf Forecasts:
How big are the waves at Castlerock today (22 Sep):
- Afternoon surf: Afternoon surf (22 Sep, local time) - 2.5ft (0.7m), 10s period with WNW swell.
- Evening surf: Evening surf (22 Sep, local time) - 3.5ft (1.0m), 15s period with NW swell.
The current surf forecast for Castlerock at 11PM is: 1.1m 14s primary swell from a Northwest direction (forecast issued at 06:00pm September 22). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 Sep) | - | - |
| Afternoon (22 Sep) | 2.5ft (0.7m) | 10s |
| Evening (22 Sep) | 3.5ft (1.0m) | 15s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 13mm), heaviest on Tue night. Very mild (max 17°C on Thu afternoon, min 10°C on Tue night). Winds increasing (calm on Wed afternoon, fresh winds from the SSW by Thu afternoon). | |||||||||||||||||||
Tue 22 | Wednesday 23 | Thursday 24 | |||||||||||||||||
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 15 | NW 14 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | WNW 13 | NW 17 |
Wave Graph  | |||||||||||||||||||
 kJ | 80 | 275 | 482 | 589 | 639 | 564 | 501 | 543 | 471 | 403 | 278 | 263 | 258 | 191 | 122 | 122 | 106 | 290 | 1061 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | cross-on | cross | cross | cross-on | cross-on | glassy | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off |
High Tide | 4:57PM1.46m | 5:01AM1.30m | 5:23PM1.62m | 5:29AM1.43m | 5:49PM1.76m | ||||||||||||||
Low Tide | 11:24PM0.49m | 11:11AM0.36m | 11:53PM0.35m | 11:42AM0.23m | |||||||||||||||
 | |  |  | |  |  |  | | |  |  | | |  | | | | | |
 | — | — | — | — | — | 7:13 | — | — | — | — | — | — | — | 7:15 | — | — | — | — | — |
 | — | 7:27 | — | — | — | — | — | — | — | 7:23 | — | — | — | — | — | — | — | 7:22 | — |
mm | 1 | 1 | 1 | 7 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 14 | 12 | 12 | 10 | 11 | 11 | 12 | 13 | 13 | 13 | 12 | 11 | 10 | 11 | 12 | 14 | 17 | 17 | 12 |
Feels °C | 12 | 11 | 10 | 7 | 8 | 8 | 8 | 9 | 10 | 12 | 10 | 7 | 6 | 6 | 6 | 8 | 11 | 12 | 8 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | WNW 15 | NW 14 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | WNW 13 | NW 17 |
| kJ | 80 | 275 | 482 | 589 | 639 | 564 | 501 | 543 | 471 | 403 | 278 | 263 | 258 | 191 | 122 | 122 | 106 | 290 | 1061 |
Swell 2 Height (m) Direction Period (s) | NW 17 | NW 9 | — | — | — | — | — | — | — | — | — | — | — | — | NW 13 | NW 13 | NW 13 | SE 6 | ESE 4 |
| kJ | 47 | 21 | — | — | — | — | — | — | — | — | — | — | — | — | 27 | 45 | 45 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | NW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 4 | — | — |
| kJ | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NW 3 | — | NW 3 | — | — | — | — | — | — | — | SE 3 | SE 3 | SE 4 | S 3 | SSE 3 | SSW 3 |
| kJ | — | — | — | 2 | — | 1 | — | — | — | — | — | — | — | 2 | 9 | 20 | 5 | 4 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 42 | 66 | 71 | 40 | 27 | 27 | 187 | 300 | 27 | 0 | 0 | 2 | 2 | 306 | 377 | 378 | 194 | 377 | 9 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
Header Global | |||||||||||||||||||
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