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Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 am Wednesday 10 Dec 2025 GMTForecast update in hr min s Forecast update imminent
Castlerock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castlerock sea temperature is
10.8° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 2PM is: 1.7m 11s primary swell from a Northwest direction and 0.8m 13s secondary swell from a Northwest direction (forecast issued at 11:00am December 10). An open ocean swell of 0.9m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Dec) | 5.5ft (1.7m) | 12s |
| Afternoon (10 Dec) | 5.5ft (1.7m) | 11s |
| Evening (10 Dec) | 6ft (1.8m) | 13s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 11 | 11 | 13 | 13 | 14 | 14 | 13 | 13 | 14 | 15 | 18 | 17 | 17 | 16 | 17 | 18 | 18 | 18 | 18 | 17 | 17 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 822 | 771 | 715 | 1185 | 1034 | 1167 | 976 | 732 | 440 | 474 | 455 | 1292 | 1489 | 1713 | 1825 | 2595 | 3723 | 3539 | 3063 | 2600 | 2512 | 2454 | 2445 | 2133 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | cross- off | cross- off | cross- off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide / height (m) | 9:51AM 1.68 | 9:57PM 1.15 | 10:56AM 1.56 | 11:07PM 1.07 | 12:11PM 1.47 | 12:40AM 1.06 | ||||||||||||||||||
Low Tide / height (m) | 4:47PM 0.50 | 4:16AM 0.39 | 5:52PM 0.57 | 5:19AM 0.48 | 7:00PM 0.60 | |||||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| Sunrise | 8:41 | - | - | - | - | - | - | - | 8:41 | - | - | - | - | - | - | - | 8:42 | - | - | - | - | - | - | - |
| Sunset | - | - | 3:57 | - | - | - | - | - | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - | - | - | - | - |
 | |  |  | |  | | |  |  | |  | | |  | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | 1 | 2 | 1 | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 10 | 10 | 10 | 10 | 11 | 10 | 10 | 10 | 11 | 10 | 9 | 8 | 8 | 7 | 6 | 6 | 5 | 7 | 7 | 6 | 5 | 5 | 5 | 4 |
| Feels °C (?) | 1 | 1 | 2 | 3 | 4 | 2 | 2 | 2 | 3 | 5 | 5 | 5 | 4 | 2 | 1 | 1 | 0 | 2 | 2 | 1 | 0 | 0 | -1 | -2 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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