Surf Forecasts:
How big are the waves at Castlerock today (17 Oct):
- Morning surf: Morning surf (17 Oct, local time) - 2.5ft (0.8m), 12s period with NW swell.
- Afternoon surf: Afternoon surf (17 Oct, local time) - 3ft (0.9m), 12s period with NW swell.
- Evening surf: Evening surf (17 Oct, local time) - 2.5ft (0.8m), 11s period with NW swell.
The current surf forecast for Castlerock at 9AM is: 0.8m 12s primary swell from a Northwest direction and 0.9m 8s secondary swell from a North-northwest direction (forecast issued at 12:00am October 17). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Oct) | 2.5ft (0.8m) | 12s |
| Afternoon (17 Oct) | 3ft (0.9m) | 12s |
| Evening (17 Oct) | 2.5ft (0.8m) | 11s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastMostly dry. Very mild (max 12°C on Fri night, min 7°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Saturday 17 | Sunday 18 | Monday 19 | ||||||||||||||||||||||
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) | NNW 9 | NNW 8 | NW 13 | NW 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | WNW 14 | WNW 13 | WNW 13 | NW 17 | NW 16 | NW 16 | NW 16 | NW 15 | NW 15 | NW 15 |
Wave Graph  | ||||||||||||||||||||||||
 kJ | 288 | 173 | 193 | 149 | 169 | 224 | 183 | 177 | 147 | 114 | 110 | 85 | 80 | 100 | 134 | 154 | 96 | 106 | 310 | 480 | 603 | 777 | 836 | 836 |
Wind (km/h) | ||||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | cross-on | glassy | off | off | off | off | off | glassy | glassy | glassy | cross-off | off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:14AM1.32m | 10:16PM1.09m | 11:22AM1.20m | 11:25PM0.98m | 2:03PM1.18m | |||||||||||||||||||
Low Tide | 3:50AM0.56m | 5:08PM0.73m | 4:51AM0.66m | 7:02PM0.81m | 6:52AM0.71m | 8:58PM0.76m | ||||||||||||||||||
 |  | |  |  | | | | | | | | | | | | | | | | | | | | |
 | — | — | 7:58 | — | — | — | — | — | — | — | 8:00 | — | — | — | — | — | — | — | 8:03 | — | — | — | — | — |
 | — | — | — | — | — | 6:23 | — | — | — | — | — | — | — | 6:22 | — | — | — | — | — | — | — | 6:19 | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 10 | 9 | 9 | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 8 | 10 | 10 | 9 | 8 | 7 | 7 | 7 | 10 | 12 | 11 | 9 |
Feels °C | 6 | 6 | 6 | 7 | 8 | 8 | 8 | 7 | 5 | 5 | 4 | 4 | 6 | 9 | 9 | 6 | 5 | 4 | 3 | 5 | 7 | 8 | 8 | 5 |
Swell 1 Height (m) Direction Period (s) | NNW 9 | NNW 8 | NNW 8 | NNW 9 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | WNW 14 | WNW 13 | WNW 13 | WNW 13 | NW 16 | NW 16 | NW 16 | NW 15 | NW 15 | NW 15 |
| kJ | 288 | 173 | 110 | 124 | 169 | 224 | 183 | 177 | 147 | 114 | 110 | 85 | 80 | 100 | 134 | 154 | 96 | 65 | 310 | 480 | 603 | 777 | 836 | 836 |
Swell 2 Height (m) Direction Period (s) | NW 12 | NW 12 | NW 13 | NW 12 | NW 7 | NNW 8 | N 9 | N 9 | N 9 | — | — | W 17 | NW 16 | NW 15 | WNW 10 | NW 20 | WNW 18 | NW 17 | — | — | — | — | — | — |
| kJ | 142 | 142 | 193 | 149 | 56 | 12 | 6 | 6 | 2 | — | — | 6 | 11 | 83 | 64 | 15 | 31 | 106 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | NNW 13 | NNW 13 | N 13 | N 13 | NNW 9 | N 12 | — | — | — | — | — | — | — | — | — | — | — | N 9 | — | — | — | — | — | — |
| kJ | 59 | 58 | 31 | 30 | 16 | 12 | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 4 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 114 | 71 | 71 | 27 | 40 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 |
Best forecast wave conditions in Londonderry | ||||||||||||||||||||||||
Best forecast wave conditions in Ireland | ||||||||||||||||||||||||
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