Surf Forecasts:
How big are the waves at Castlerock today (20 Sep):
- Morning surf: Morning surf (20 Sep, local time) - 8ft (2.4m), 12s period with NW swell.
- Afternoon surf: Afternoon surf (20 Sep, local time) - 6ft (1.8m), 11s period with NW swell.
- Evening surf: Evening surf (20 Sep, local time) - 5ft (1.6m), 11s period with NW swell.
The current surf forecast for Castlerock at 8AM is: 2.2m 12s primary swell from a Northwest direction (forecast issued at 12:00am September 20). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Sep) | 8ft (2.4m) | 12s |
| Afternoon (20 Sep) | 6ft (1.8m) | 11s |
| Evening (20 Sep) | 5ft (1.6m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 6mm), mostly falling on Sun night. Warm (max 22°C on Mon afternoon, min 12°C on Sat night). Winds decreasing (fresh winds from the W on Sat night, light winds from the NW by Tue afternoon). | ||||||||||||||||||||||||
Sunday 20 | Monday 21 | Tuesday 22 | ||||||||||||||||||||||
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) | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 12 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 11 | WNW 10 | NW 18 | NW 15 | NW 14 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 1547 | 1521 | 1280 | 1470 | 882 | 729 | 617 | 593 | 653 | 481 | 361 | 268 | 220 | 176 | 140 | 115 | 115 | 108 | 65 | 135 | 92 | 58 | 223 | 297 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross-off | off | off | off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-on | on | cross-on | on |
High Tide | 00:31AM0.95m | 3:29PM1.15m | 3:56AM1.03m | 4:25PM1.30m | 4:33AM1.16m | 4:57PM1.46m | ||||||||||||||||||
Low Tide | 7:54AM0.76m | 9:57PM0.75m | 9:43AM0.65m | 10:51PM0.62m | 10:35AM0.50m | |||||||||||||||||||
 | | |  | |  | |  | |  | | | | | | | | | |  |  | | | | |
 | — | — | 7:07 | — | — | — | — | — | — | — | 7:09 | — | — | — | — | — | — | — | 7:11 | — | — | — | — | — |
 | — | — | — | — | — | — | 7:31 | — | — | — | — | — | — | — | 7:30 | — | — | — | — | — | — | — | 7:27 | — |
mm | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | 1 |
Temp °C | 12 | 12 | 12 | 13 | 14 | 14 | 13 | 13 | 12 | 12 | 14 | 17 | 20 | 22 | 21 | 19 | 18 | 17 | 15 | 15 | 13 | 12 | 12 | 12 |
Feels °C | 4 | 4 | 5 | 7 | 9 | 10 | 11 | 10 | 8 | 8 | 12 | 16 | 18 | 21 | 20 | 18 | 17 | 15 | 13 | 13 | 11 | 10 | 11 | 10 |
Swell 1 Height (m) Direction Period (s) | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 12 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | NW 15 | NW 14 |
| kJ | 1547 | 1521 | 1280 | 1132 | 882 | 729 | 617 | 593 | 653 | 481 | 361 | 268 | 220 | 176 | 140 | 115 | 115 | 108 | 65 | 135 | 92 | 58 | 223 | 297 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NW 8 | — | — | — | — | — | — | — | — | WNW 12 | — | — | NW 18 | WNW 9 | — |
| kJ | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | 58 | — | — | 48 | 8 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 20 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NW 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 9 |
| kJ | — | — | — | 1470 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 29 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 364 | 387 | 339 | 353 | 162 | 162 | 9 | 0 | 0 | 0 | 0 | 4 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 42 | 27 | 9 | 71 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
Nearest