Surf Forecasts:
How big are the waves at Castlerock today (23 Sep):
- Morning surf: Morning surf (23 Sep, local time) - 4ft (1.2m), 13s period with NW swell.
- Afternoon surf: Afternoon surf (23 Sep, local time) - 4.5ft (1.3m), 12s period with NW swell.
- Evening surf: Evening surf (23 Sep, local time) - 3.5ft (1.1m), 11s period with NW swell.
The current surf forecast for Castlerock at 11AM is: 1.3m 13s primary swell from a Northwest direction (forecast issued at 06:00am September 23). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (23 Sep) | 4ft (1.2m) | 13s |
| Afternoon (23 Sep) | 4.5ft (1.3m) | 12s |
| Evening (23 Sep) | 3.5ft (1.1m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 3mm), mostly falling on Thu night. Very mild (max 18°C on Thu afternoon, min 10°C on Wed night). Winds increasing (light winds from the WNW on Wed afternoon, fresh winds from the S by Thu morning). | |||||||||||||||||||||||
Wednesday 23 | Thursday 24 | Friday 25 | |||||||||||||||||||||
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) | 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 18 | NW 17 | NW 17 | NW 16 | NW 16 | NW 15 | NW 14 | NW 14 | NW 13 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 639 | 564 | 552 | 543 | 416 | 361 | 278 | 263 | 258 | 191 | 122 | 104 | 127 | 290 | 1077 | 2380 | 2621 | 2357 | 2146 | 1860 | 1407 | 1150 | 991 |
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-off | cross-off | cross-off | off | off | off | off | off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off |
High Tide | 5:01AM1.30m | 5:23PM1.62m | 5:29AM1.43m | 5:49PM1.76m | 5:57AM1.55m | 6:16PM1.88m | |||||||||||||||||
Low Tide | 11:11AM0.36m | 11:53PM0.35m | 11:42AM0.23m | 00:20AM0.24m | 12:10PM0.13m | ||||||||||||||||||
 |  |  |  | | |  | | | |  | | | | | | | | | | | | | |
 | — | 7:13 | — | — | — | — | — | — | — | 7:15 | — | — | — | — | — | — | — | 7:16 | — | — | — | — | — |
 | — | — | — | — | — | 7:23 | — | — | — | — | — | — | — | 7:22 | — | — | — | — | — | — | — | 7:19 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 12 | 13 | 13 | 13 | 12 | 11 | 10 | 10 | 12 | 15 | 18 | 17 | 13 | 13 | 13 | 12 | 12 | 13 | 13 | 13 | 11 |
Feels °C | 10 | 8 | 8 | 8 | 9 | 12 | 10 | 7 | 5 | 5 | 6 | 9 | 13 | 13 | 9 | 10 | 10 | 9 | 8 | 9 | 9 | 9 | 7 |
Swell 1 Height (m) Direction Period (s) | 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 18 | NW 17 | NW 17 | NW 16 | NW 16 | NW 15 | NW 14 | NW 14 | NW 13 |
| kJ | 639 | 564 | 552 | 543 | 416 | 361 | 278 | 263 | 258 | 191 | 122 | 104 | 127 | 290 | 1077 | 2380 | 2621 | 2357 | 2146 | 1860 | 1407 | 1150 | 991 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NW 13 | NW 13 | SE 4 | — | ESE 4 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 27 | 58 | 4 | — | 1 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SE 3 | SE 3 | SSE 4 | S 3 | S 4 | S 3 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 2 | 9 | 16 | 6 | 6 | 2 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 27 | 27 | 187 | 187 | 27 | 9 | 0 | 2 | 2 | 194 | 332 | 378 | 194 | 377 | 27 | 9 | 9 | 4 | 9 | 9 | 0 | 0 | 0 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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