Surf Forecasts:
How big are the waves at Castlerock today (15 Sep):
- Afternoon surf: Afternoon surf (15 Sep, local time) - 3.5ft (1.1m), 5s period with NW swell.
- Evening surf: Evening surf (15 Sep, local time) - 3.5ft (1.1m), 6s period with NW swell.
The current surf forecast for Castlerock at 11PM is: 1.1m 6s primary swell from a Northwest direction and 0.4m 9s secondary swell from a West-northwest direction (forecast issued at 06:00pm September 15). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Sep) | - | - |
| Afternoon (15 Sep) | 3.5ft (1.1m) | 5s |
| Evening (15 Sep) | 3.5ft (1.1m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 10mm), heaviest on Fri morning. Very mild (max 15°C on Wed morning, min 12°C on Wed night). Winds increasing (moderate winds from the WSW on Wed morning, strong winds from the W by Thu afternoon). | |||||||||||||||||||
Tue 15 | Wednesday 16 | Thursday 17 | |||||||||||||||||
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 5 | NW 6 | NW 6 | NW 6 | NW 6 | WNW 12 | WNW 11 | NW 11 | WNW 10 | NW 10 | WNW 9 | WNW 9 | WNW 10 | WNW 10 | NW 11 | NW 12 | NW 13 | NW 14 | NW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 66 | 67 | 75 | 80 | 93 | 117 | 135 | 286 | 204 | 139 | 141 | 207 | 320 | 554 | 949 | 1499 | 3174 | 4555 | 4493 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross |
High Tide | 9:13PM1.60m | 9:24AM1.54m | 9:41PM1.41m | 9:56AM1.41m | |||||||||||||||
Low Tide | 3:12PM0.22m | 3:29AM0.36m | 3:47PM0.38m | 3:55AM0.49m | 4:27PM0.56m | ||||||||||||||
 |  |  |  |  |  |  |  | | |  | | | | | | | | | |
 | — | — | — | — | — | 7:00 | — | — | — | — | — | — | — | 7:01 | — | — | — | — | — |
 | — | 7:45 | — | — | — | — | — | — | — | 7:43 | — | — | — | — | — | — | — | 7:39 | — |
mm | 1 | — | — | — | — | 1 | — | — | — | — | 1 | 1 | — | — | — | 1 | 1 | — | — |
Temp °C | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 15 | 15 | 14 | 14 | 13 | 12 | 12 | 12 | 13 | 13 | 13 | 12 |
Feels °C | 9 | 8 | 8 | 8 | 8 | 9 | 8 | 11 | 10 | 8 | 9 | 7 | 7 | 6 | 4 | 5 | 5 | 5 | 5 |
Swell 1 Height (m) Direction Period (s) | N 9 | WNW 10 | WNW 9 | WNW 10 | WNW 12 | WNW 12 | WNW 11 | NW 11 | WNW 10 | NW 10 | WNW 9 | WNW 9 | WNW 10 | WNW 10 | NW 11 | NW 12 | NW 13 | NW 14 | NW 14 |
| kJ | 2 | 37 | 34 | 18 | 82 | 117 | 135 | 286 | 204 | 139 | 141 | 207 | 320 | 554 | 949 | 1499 | 3174 | 4555 | 4493 |
Swell 2 Height (m) Direction Period (s) | — | — | — | WNW 12 | — | — | — | — | — | — | — | N 8 | N 8 | N 8 | — | — | — | — | — |
| kJ | — | — | — | 15 | — | — | — | — | — | — | — | 5 | 1 | 1 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 5 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | — | — | SW 3 | SW 3 | W 3 | SW 3 | SSW 3 | W 4 | W 4 | — | — | — |
| kJ | 66 | 67 | 75 | 80 | 93 | 85 | 72 | — | — | 3 | 4 | 4 | 1 | 2 | 12 | 19 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 772 | 1035 | 413 | 413 | 413 | 144 | 71 | 187 | 9 | 309 | 323 | 339 | 340 | 328 | 341 | 1034 | 772 | 772 | 772 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||
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