Surf Forecasts:
How big are the waves at Castlerock today (22 Sep):
- Morning surf: Morning surf (22 Sep, local time) - 2.5ft (0.8m), 10s period with WNW swell.
- Afternoon surf: Afternoon surf (22 Sep, local time) - 2.5ft (0.7m), 10s period with WNW swell.
- Evening surf: Evening surf (22 Sep, local time) - 3.5ft (1.0m), 15s period with NW swell.
The current surf forecast for Castlerock at 2PM is: 0.7m 10s primary swell from a West-northwest direction (forecast issued at 06:00am September 22). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 Sep) | 2.5ft (0.8m) | 10s |
| Afternoon (22 Sep) | 2.5ft (0.7m) | 10s |
| Evening (22 Sep) | 3.5ft (1.0m) | 15s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Short Range ForecastHeavy rain (total 23mm), heaviest during Tue night. Very mild (max 18°C on Thu afternoon, min 10°C on Wed night). Winds increasing (calm on Wed afternoon, fresh winds from the SSW by Thu afternoon). | |||||||||||||||||||||||
Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||||||||
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 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 15 | NW 14 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 13 | NW 17 |
Wave Graph  | |||||||||||||||||||||||
 kJ | 106 | 94 | 123 | 92 | 80 | 275 | 482 | 589 | 581 | 564 | 501 | 543 | 373 | 361 | 278 | 263 | 258 | 191 | 124 | 82 | 106 | 238 | 1098 |
Wind (km/h) | |||||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | glassy | cross-off | cross-off | cross-off | off | off | off | off | off | cross |
High Tide | 4:33AM1.16m | 4:57PM1.46m | 5:01AM1.30m | 5:23PM1.62m | 5:29AM1.43m | 5:49PM1.76m | |||||||||||||||||
Low Tide | 10:35AM0.50m | 11:24PM0.49m | 11:11AM0.36m | 11:53PM0.35m | 11:42AM0.23m | ||||||||||||||||||
 |  |  |  |  | |  |  | | |  | | | | |  | | | | | | | | |
 | — | 7:11 | — | — | — | — | — | — | — | 7:13 | — | — | — | — | — | — | — | 7:15 | — | — | — | — | — |
 | — | — | — | — | — | 7:27 | — | — | — | — | — | — | — | 7:23 | — | — | — | — | — | — | — | 7:22 | — |
mm | — | — | — | — | 2 | 4 | 3 | 9 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 17 | 16 | 17 | 17 | 13 | 12 | 12 | 11 | 11 | 12 | 12 | 13 | 13 | 12 | 12 | 11 | 10 | 10 | 12 | 15 | 18 | 17 | 13 |
Feels °C | 16 | 14 | 15 | 16 | 11 | 11 | 10 | 9 | 9 | 9 | 8 | 9 | 10 | 11 | 10 | 7 | 5 | 5 | 6 | 9 | 13 | 13 | 10 |
Swell 1 Height (m) Direction Period (s) | NW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 15 | NW 14 | NW 14 | NW 14 | NW 14 | NW 13 | NW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 13 | NW 17 |
| kJ | 106 | 94 | 123 | 92 | 80 | 275 | 482 | 589 | 581 | 564 | 501 | 543 | 373 | 361 | 278 | 263 | 258 | 191 | 124 | 82 | 106 | 238 | 1098 |
Swell 2 Height (m) Direction Period (s) | — | NW 12 | — | — | NW 17 | NW 9 | — | — | — | — | — | — | — | — | — | — | — | — | NW 13 | NW 13 | NW 13 | ESE 6 | SE 3 |
| kJ | — | 6 | — | — | 47 | 21 | — | — | — | — | — | — | — | — | — | — | — | — | 27 | 44 | 46 | 6 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | NW 19 | NW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 4 | — | — |
| kJ | — | — | — | 15 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 2 | SE 3 | SE 4 | S 3 | S 3 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 6 | 15 | 3 | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 9 | 27 | 66 | 71 | 240 | 27 | 27 | 187 | 251 | 146 | 0 | 0 | 2 | 2 | 121 | 121 | 378 | 185 | 0 | 377 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||||
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