Surf Forecasts:
How big are the waves at Castlerock today (30 Sep):
- Morning surf: Morning surf (30 Sep, local time) - 0.5ft (0.1m), 14s period with W swell.
- Afternoon surf: Afternoon surf (30 Sep, local time) - 0.5ft (0.1m), 12s period with W swell.
- Evening surf: Evening surf (30 Sep, local time) - 1.5ft (0.4m), 13s period with WNW swell.
The current surf forecast for Castlerock at 11AM is: 0.1m 13s primary swell from a West direction and 0.1m 10s secondary swell from a North direction (forecast issued at 06:00am September 30). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (30 Sep) | 0.5ft (0.1m) | 14s |
| Afternoon (30 Sep) | 0.5ft (0.1m) | 12s |
| Evening (30 Sep) | 1.5ft (0.4m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 6mm), mostly falling on Fri morning. Very mild (max 16°C on Wed morning, min 10°C on Wed night). Winds decreasing (strong winds from the S on Wed morning, light winds from the SW by Fri night). | |||||||||||||||||||||||
Wednesday 30 | Thursday 1 | Friday 2 | |||||||||||||||||||||
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) | W 14 | W 14 | W 14 | W 13 | W 12 | WNW 12 | WNW 14 | WNW 16 | WNW 16 | WNW 16 | WNW 15 | WNW 14 | WNW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 4 | 4 | 4 | 3 | 3 | 14 | 104 | 749 | 1257 | 1322 | 1332 | 1142 | 1080 | 893 | 780 | 613 | 502 | 479 | 367 | 355 | 298 | 320 | 314 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off |
High Tide | 8:41AM1.73m | 9:03PM1.71m | 9:21AM1.64m | 9:45PM1.52m | 10:09AM1.51m | ||||||||||||||||||
Low Tide | 2:38AM0.17m | 2:49PM0.17m | 3:11AM0.28m | 3:34PM0.31m | 3:51AM0.41m | 4:34PM0.48m | |||||||||||||||||
 |  |  | |  | |  | |  | | | | |  |  |  | | | |  |  | | | |
 | — | 7:26 | — | — | — | — | — | — | — | 7:28 | — | — | — | — | — | — | — | 7:30 | — | — | — | — | — |
 | — | — | — | — | — | 7:06 | — | — | — | — | — | — | — | 7:04 | — | — | — | — | — | — | — | 7:00 | — |
mm | 16 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | 2 | 2 | — | — |
Temp °C | 15 | 14 | 14 | 16 | 16 | 14 | 12 | 11 | 10 | 10 | 11 | 14 | 15 | 14 | 14 | 13 | 13 | 13 | 14 | 14 | 14 | 13 | 11 |
Feels °C | 10 | 8 | 7 | 9 | 9 | 9 | 7 | 6 | 5 | 6 | 6 | 9 | 9 | 8 | 9 | 9 | 10 | 9 | 11 | 10 | 10 | 9 | 7 |
Swell 1 Height (m) Direction Period (s) | ESE 6 | W 14 | W 14 | W 13 | W 12 | WNW 12 | WNW 14 | WNW 16 | WNW 16 | WNW 16 | WNW 15 | WNW 14 | WNW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 |
| kJ | 109 | 4 | 4 | 3 | 3 | 14 | 104 | 749 | 1257 | 1322 | 1332 | 1142 | 1080 | 893 | 780 | 613 | 502 | 479 | 367 | 355 | 298 | 320 | 314 |
Swell 2 Height (m) Direction Period (s) | N 10 | N 10 | N 10 | N 9 | N 9 | N 10 | ESE 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | 2 | 2 | 2 | 2 | 2 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 14 | W 9 | — | — | — | — | N 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | 2 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SE 6 | SSE 4 | SSE 4 | SSE 4 | SE 5 | S 2 | SSE 3 | — | — | — | — | — | — | SSE 3 | SSE 3 | SSE 3 | SSE 3 | SSE 2 | SSE 3 | S 2 | WSW 3 | — |
| kJ | 8 | 46 | 18 | 32 | 29 | 17 | 1 | 3 | — | — | — | — | — | — | 3 | 3 | 2 | 2 | 1 | 3 | 1 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 492 | 363 | 273 | 287 | 273 | 273 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 251 | 9 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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