Surf Forecasts:
How big are the waves at Castlerock today (21 Sep):
- Morning surf: Morning surf (21 Sep, local time) - 3.5ft (1.1m), 12s period with NW swell.
- Afternoon surf: Afternoon surf (21 Sep, local time) - 3ft (0.9m), 11s period with NW swell.
- Evening surf: Evening surf (21 Sep, local time) - 2.5ft (0.7m), 11s period with NW swell.
The current surf forecast for Castlerock at 6AM is: 1.1m 12s primary swell from a Northwest direction and 0.4m 7s secondary swell from a North-northwest direction (forecast issued at 12:00am September 21). The wind direction is predicted to be offshore and the swell rating is 2.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Sep) | 3.5ft (1.1m) | 12s |
| Afternoon (21 Sep) | 3ft (0.9m) | 11s |
| Evening (21 Sep) | 2.5ft (0.7m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastModerate rain (total 11mm), heaviest on Tue night. Warm (max 22°C on Mon afternoon, min 10°C on Tue night). Wind will be generally light. | ||||||||||||||||||||||||
Monday 21 | Tuesday 22 | Wednesday 23 | ||||||||||||||||||||||
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 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 15 | NW 15 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 653 | 481 | 282 | 309 | 220 | 179 | 140 | 117 | 115 | 106 | 92 | 123 | 90 | 58 | 279 | 418 | 589 | 556 | 556 | 552 | 543 | 373 | 403 | 338 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy |
High Tide | 3:56AM1.03m | 4:25PM1.30m | 4:33AM1.16m | 4:57PM1.46m | 5:01AM1.30m | 5:23PM1.62m | ||||||||||||||||||
Low Tide | 9:43AM0.65m | 10:51PM0.62m | 10:35AM0.50m | 11:24PM0.49m | 11:11AM0.36m | |||||||||||||||||||
 | | |  |  | |  |  | | | | |  | | |  | |  | | | | | | | |
 | — | — | 7:09 | — | — | — | — | — | — | — | 7:11 | — | — | — | — | — | — | — | 7:13 | — | — | — | — | — |
 | — | — | — | — | — | — | 7:30 | — | — | — | — | — | — | — | 7:27 | — | — | — | — | — | — | — | 7:23 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 2 | 4 | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 15 | 16 | 20 | 22 | 21 | 18 | 18 | 17 | 16 | 16 | 14 | 12 | 12 | 11 | 10 | 12 | 12 | 12 | 13 | 13 | 12 | 11 |
Feels °C | 10 | 10 | 13 | 15 | 19 | 21 | 21 | 17 | 16 | 15 | 14 | 14 | 12 | 11 | 10 | 9 | 8 | 10 | 8 | 8 | 8 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 15 | NW 15 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 12 |
| kJ | 653 | 481 | 282 | 309 | 220 | 179 | 140 | 117 | 115 | 106 | 92 | 123 | 90 | 58 | 279 | 418 | 589 | 556 | 556 | 552 | 543 | 373 | 403 | 338 |
Swell 2 Height (m) Direction Period (s) | — | NNW 8 | NNW 7 | — | — | — | — | — | — | — | WNW 12 | — | — | WNW 18 | NW 9 | WNW 9 | — | — | — | — | — | — | — | — |
| kJ | — | 7 | 31 | — | — | — | — | — | — | — | 15 | — | — | 31 | 21 | 32 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NW 20 | NW 15 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 15 | 9 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 3 | — | — | NW 3 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | 5 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 42 | 27 | 71 | 40 | 9 | 27 | 27 | 71 | 411 | 71 | 40 | 0 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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