Surf Forecasts:
How big are the waves at Castlerock today (17 Sep):
- 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 10PM is: 3.5m 15s primary swell from a Northwest direction (forecast issued at 06:00pm September 17). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | - | - |
| 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 8mm), mostly falling on Fri morning. Very mild (max 16°C on Fri afternoon, min 11°C on Sat night). Mainly strong winds. | |||||||||||||||||||
Thu 17 | Friday 18 | Saturday 19 | |||||||||||||||||
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 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 | WNW 11 | NW 11 | NW 11 | NW 12 | NW 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 3905 | 5438 | 4823 | 3889 | 3253 | 2511 | 1952 | 1475 | 1031 | 1007 | 766 | 629 | 572 | 496 | 742 | 860 | 1064 | 1141 | 1468 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:10PM1.24m | 10:35AM1.27m | 10:47PM1.08m | 11:48AM1.13m | |||||||||||||||
Low Tide | 4:27PM0.56m | 4:27AM0.61m | 5:28PM0.72m | 5:29AM0.73m | 7:38PM0.82m | ||||||||||||||
 |  |  | |  |  |  | | | |  | | | |  | | | | | |
 | — | — | — | — | — | 7:03 | — | — | — | — | — | — | — | 7:05 | — | — | — | — | — |
 | — | 7:39 | — | — | — | — | — | — | — | 7:37 | — | — | — | — | — | — | — | 7:35 | — |
mm | — | — | — | — | — | — | 1 | 3 | 2 | — | 2 | — | — | — | — | — | — | — | — |
Temp °C | 14 | 13 | 12 | 13 | 13 | 13 | 12 | 13 | 16 | 16 | 16 | 15 | 14 | 13 | 13 | 14 | 14 | 13 | 12 |
Feels °C | 6 | 5 | 5 | 6 | 7 | 8 | 7 | 7 | 12 | 13 | 12 | 10 | 9 | 6 | 6 | 6 | 7 | 6 | 4 |
Swell 1 Height (m) Direction Period (s) | — | 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 | — | 5438 | 4823 | 3889 | 3253 | 2511 | 1952 | 1475 | 1031 | 1007 | 766 | 629 | 572 | 496 | — | 860 | 1064 | 1141 | 1468 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SSE 4 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 13 | — | — | — | — | — | SW 3 | SSW 3 | WSW 3 | — | — | WSW 3 | SW 3 | W 4 | WNW 11 | W 4 | W 4 | W 4 | SW 3 |
| kJ | 3905 | — | — | — | — | — | 5 | 3 | 6 | — | — | 4 | 2 | 13 | 742 | 21 | 21 | 19 | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 772 | 772 | 439 | 387 | 595 | 27 | 14 | 387 | 387 | 9 | 387 | 707 | 751 | 742 | 380 | 380 | 380 | 300 | 364 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
Header Global | |||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castlerock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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