Surf Forecasts:
How big are the waves at Castlerock today (23 Jul):
- Morning surf: Morning surf (23 Jul, local time) - 2.5ft (0.7m), 7s period with NNW swell.
- Afternoon surf: Afternoon surf (23 Jul, local time) - 2ft (0.6m), 6s period with NNW swell.
- Evening surf: Evening surf (23 Jul, local time) - 2ft (0.6m), 6s period with NW swell.
The current surf forecast for Castlerock at 8PM is: 0.6m 6s primary swell from a Northwest direction and 0.2m 9s secondary swell from a West-northwest direction (forecast issued at 12:00pm July 23). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (23 Jul) | 2.5ft (0.7m) | 7s |
| Afternoon (23 Jul) | 2ft (0.6m) | 6s |
| Evening (23 Jul) | 2ft (0.6m) | 6s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 6mm), mostly falling on Fri night. Very mild (max 19°C on Fri morning, min 12°C on Thu night). Winds decreasing (fresh winds from the WSW on Fri night, calm by Sat night). | |||||||||||||||||||||
Thu 23 | Friday 24 | Saturday 25 | |||||||||||||||||||
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 7 | NNW 6 | NW 6 | NW 6 | NW 6 | NW 7 | NW 10 | NW 10 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 9 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 38 | 28 | 33 | 33 | 34 | 44 | 170 | 204 | 183 | 197 | 206 | 153 | 176 | 158 | 180 | 367 | 653 | 703 | 731 | 677 | 562 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 2:27PM1.15m | 3:07AM1.16m | 3:55PM1.22m | 4:19AM1.19m | 4:53PM1.32m | ||||||||||||||||
Low Tide | 8:00AM0.66m | 8:37PM0.69m | 9:20AM0.65m | 10:15PM0.66m | 10:33AM0.59m | ||||||||||||||||
 |  | | |  |  | |  | | | | |  |  | |  |  | | | | | |
 | 5:18 | — | — | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — |
 | — | — | — | 9:46 | — | — | — | — | — | — | — | 9:45 | — | — | — | — | — | — | — | 9:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | 1 | — | — | — | — |
Temp °C | 13 | 14 | 15 | 15 | 13 | 12 | 12 | 12 | 16 | 19 | 19 | 17 | 14 | 13 | 14 | 14 | 14 | 16 | 16 | 15 | 14 |
Feels °C | 11 | 12 | 11 | 11 | 10 | 9 | 9 | 9 | 12 | 15 | 14 | 12 | 11 | 8 | 8 | 9 | 9 | 11 | 12 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | NNW 7 | NNW 6 | W 8 | WNW 9 | NW 6 | NW 7 | NW 10 | NW 10 | NW 9 | NW 9 | — | NW 8 | NW 8 | NW 8 | NW 8 | NW 9 | — | — | NW 10 | NW 10 | NW 10 |
| kJ | 38 | 28 | 1 | 7 | 34 | 44 | 170 | 204 | 183 | 197 | — | 153 | 176 | 158 | 180 | 367 | — | — | 731 | 677 | 562 |
Swell 2 Height (m) Direction Period (s) | W 8 | W 9 | — | — | NW 12 | NW 11 | NW 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 2 | — | — | 5 | 29 | 89 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | NW 6 | NW 6 | — | — | — | — | WNW 3 | — | NW 8 | W 4 | — | — | W 3 | W 3 | NW 10 | NW 10 | — | — | — |
| kJ | — | — | 33 | 33 | — | — | — | — | 3 | — | 206 | 7 | — | — | 7 | 5 | 653 | 703 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 377 | 1319 | 1268 | 27 | 0 | 0 | 9 | 419 | 71 | 1263 | 1287 | 9 | 1174 | 848 | 1081 | 387 | 387 | 387 | 172 | 9 | |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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