Surf Forecasts:
How big are the waves at Castlerock today (17 Sep):
- Morning surf: Morning surf (17 Sep, local time) - 6ft (1.9m), 11s period with NW swell.
- Afternoon surf: Afternoon surf (17 Sep, local time) - 10ft (3.0m), 13s period with NW swell.
- Evening surf: Evening surf (17 Sep, local time) - 11ft (3.5m), 15s period with NW swell.
The current surf forecast for Castlerock at 4AM is: 1.4m 9s primary swell from a West-northwest direction and 0.1m 8s secondary swell from a North direction (forecast issued at 12:00am September 17). The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | 6ft (1.9m) | 11s |
| Afternoon (17 Sep) | 10ft (3.0m) | 13s |
| Evening (17 Sep) | 11ft (3.5m) | 15s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 9mm), mostly falling on Fri morning. Very mild (max 16°C on Fri afternoon, min 12°C on Wed night). Mainly strong winds. | ||||||||||||||||||||||||
Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||||||||||
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 | 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 9 | WNW 9 | NW 10 | NW 11 | NW 13 | NW 13 | NW 15 | NW 15 | NW 14 | NW 14 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | WNW 11 | NW 11 | NW 12 | NW 12 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 237 | 327 | 480 | 1027 | 2204 | 3732 | 5512 | 4823 | 4078 | 3301 | 2693 | 1952 | 1569 | 1048 | 1076 | 766 | 638 | 615 | 538 | 593 | 1018 | 1193 | 1547 | 1655 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross |
High Tide | 9:56AM1.41m | 10:10PM1.24m | 10:35AM1.27m | 10:47PM1.08m | 11:48AM1.13m | |||||||||||||||||||
Low Tide | 3:55AM0.49m | 4:27PM0.56m | 4:27AM0.61m | 5:28PM0.72m | 5:29AM0.73m | 7:38PM0.82m | ||||||||||||||||||
 |  | |  |  |  |  | |  | |  |  | | | | | | | | | | | | | |
 | — | — | 7:01 | — | — | — | — | — | — | — | 7:03 | — | — | — | — | — | — | — | 7:05 | — | — | — | — | — |
 | — | — | — | — | — | — | 7:39 | — | — | — | — | — | — | — | 7:37 | — | — | — | — | — | — | — | 7:35 | — |
mm | 1 | — | — | 1 | 1 | — | — | — | — | — | — | — | 2 | 1 | 1 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 13 | 12 | 12 | 12 | 13 | 14 | 13 | 12 | 13 | 13 | 13 | 12 | 12 | 14 | 16 | 16 | 15 | 14 | 13 | 13 | 14 | 14 | 13 | 12 |
Feels °C | 7 | 6 | 5 | 4 | 5 | 6 | 5 | 5 | 6 | 7 | 8 | 7 | 7 | 10 | 12 | 12 | 10 | 9 | 7 | 6 | 6 | 7 | 6 | 5 |
Swell 1 Height (m) Direction Period (s) | N 8 | WNW 9 | NW 10 | NW 11 | — | — | NW 15 | NW 15 | NW 14 | NW 14 | NW 13 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | — | NW 11 | NW 12 | NW 12 |
| kJ | 5 | 327 | 480 | 1027 | — | — | 5512 | 4823 | 4078 | 3301 | 2693 | 1952 | 1569 | 1048 | 1076 | 766 | 638 | 615 | 538 | 593 | — | 1193 | 1547 | 1655 |
Swell 2 Height (m) Direction Period (s) | — | N 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 9 | — | WSW 3 | SW 3 | NW 13 | NW 13 | — | — | — | — | — | SW 3 | S 3 | SSW 3 | — | — | — | SSW 3 | WSW 3 | W 4 | WNW 11 | W 4 | — | — |
| kJ | 237 | — | 4 | 2 | 2204 | 3732 | — | — | — | — | — | 3 | 4 | 3 | — | — | — | 1 | 9 | 18 | 1018 | 28 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 332 | 333 | 339 | 409 | 772 | 772 | 772 | 587 | 387 | 751 | 469 | 27 | 780 | 8 | 399 | 387 | 707 | 751 | 742 | 380 | 780 | 380 | 300 | 300 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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