Surf Forecasts:
How big are the waves at Castlerock today (18 Sep):
- Morning surf: Morning surf (18 Sep, local time) - 8ft (2.5m), 13s period with NW swell.
- Afternoon surf: Afternoon surf (18 Sep, local time) - 6ft (1.9m), 12s period with NW swell.
- Evening surf: Evening surf (18 Sep, local time) - 6ft (1.8m), 11s period with NW swell.
The current surf forecast for Castlerock at 4PM is: 1.8m 12s primary swell from a Northwest direction (forecast issued at 12:00pm September 18). An open ocean swell of 0.3m 4s is not directed at the surf break, a second open ocean swell of 0.5m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Sep) | 8ft (2.5m) | 13s |
| Afternoon (18 Sep) | 6ft (1.9m) | 12s |
| Evening (18 Sep) | 6ft (1.8m) | 11s |
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 10°C on Sun night). Winds decreasing (fresh winds from the WSW on Sat morning, calm by Sun afternoon). | |||||||||||||||||||||
Fri 18 | Saturday 19 | Sunday 20 | |||||||||||||||||||
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 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 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1952 | 1569 | 884 | 1007 | 766 | 629 | 568 | 548 | 677 | 1176 | 1304 | 1302 | 1369 | 1472 | 1521 | 1396 | 1423 | 963 | 826 | 699 | 650 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross | glassy | off |
High Tide | 10:35AM1.27m | 10:47PM1.08m | 11:48AM1.13m | 00:31AM0.95m | 3:29PM1.15m | ||||||||||||||||
Low Tide | 5:28PM0.72m | 5:29AM0.73m | 7:38PM0.82m | 7:54AM0.76m | 9:57PM0.75m | ||||||||||||||||
 |  | | |  |  |  | |  | | |  | | | | | | | | | | |
 | 7:03 | — | — | — | — | — | — | 7:05 | — | — | — | — | — | — | — | 7:07 | — | — | — | — | — |
 | — | — | — | 7:37 | — | — | — | — | — | — | — | 7:35 | — | — | — | — | — | — | — | 7:31 | — |
mm | — | 2 | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 13 | 13 | 16 | 16 | 16 | 15 | 14 | 14 | 13 | 14 | 14 | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 11 |
Feels °C | 8 | 7 | 12 | 12 | 12 | 10 | 9 | 8 | 5 | 7 | 7 | 6 | 5 | 5 | 4 | 6 | 6 | 8 | 9 | 12 | 8 |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | — | NW 11 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 |
| kJ | 1952 | 1569 | 884 | 1007 | 766 | 629 | 568 | 548 | 677 | — | 1304 | 1302 | 1369 | 1472 | 1521 | 1396 | 1121 | 963 | 826 | 699 | 650 |
Swell 2 Height (m) Direction Period (s) | — | — | SSE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | S 3 | SW 3 | — | W 4 | WSW 3 | WSW 3 | WSW 3 | W 4 | WNW 11 | — | WSW 4 | — | — | — | — | NW 12 | — | — | — | — |
| kJ | — | 4 | 4 | — | 10 | 4 | 6 | 9 | 14 | 1176 | — | 10 | — | — | — | — | 1423 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 834 | 387 | 419 | 387 | 387 | 751 | 742 | 742 | 751 | 780 | 558 | 380 | 339 | 364 | 339 | 339 | 162 | 162 | 118 | 0 | 0 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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