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Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 5 am Thursday 11 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
10.9° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 11AM is: 1.1m 14s primary swell from a West-northwest direction and 0.5m 9s secondary swell from a Northwest direction (forecast issued at 05:00am December 11). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 3.5ft (1.1m) | 13s |
| Afternoon (11 Dec) | 3.5ft (1.0m) | 15s |
| Evening (11 Dec) | 5ft (1.6m) | 17s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | Sun 14 | |||||||||||||||||||||
| 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 | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 13 | 13 | 14 | 15 | 18 | 17 | 17 | 16 | 17 | 18 | 18 | 18 | 18 | 18 | 17 | 16 | 16 | 16 | 15 | 14 | 14 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 976 | 651 | 440 | 467 | 474 | 1414 | 1524 | 1619 | 1825 | 2505 | 3499 | 3578 | 3097 | 2630 | 2630 | 3087 | 3090 | 2756 | 2157 | 1542 | 1387 | 1349 | 1196 | 1093 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | cross- off | cross- off | off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 10:56AM 1.56 | 11:07PM 1.07 | 12:11PM 1.47 | 12:40AM 1.06 | 1:25PM 1.42 | |||||||||||||||||||
Low Tide / height (m) | 4:16AM 0.39 | 5:52PM 0.57 | 5:19AM 0.48 | 7:00PM 0.60 | 6:30AM 0.55 | 8:04PM 0.58 | ||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | Sun 14 | |||||||||||||||||||||
| Sunrise | - | - | 8:41 | - | - | - | - | - | - | - | 8:42 | - | - | - | - | - | - | - | 8:44 | - | - | - | - | - |
| Sunset | - | - | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - | - | - |
 |  |  |  | | | | |  | |  | |  | | | | | | | | |  | | | |
Rain (mm) | - | - | - | 1 | 3 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 |
| Temp. °C | 10 | 10 | 10 | 11 | 9 | 9 | 8 | 7 | 6 | 5 | 5 | 7 | 8 | 8 | 7 | 7 | 7 | 8 | 9 | 11 | 12 | 13 | 13 | 13 |
| Feels °C (?) | 3 | 2 | 1 | 5 | 5 | 4 | 4 | 2 | 1 | 0 | -1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 2 | 2 | 4 | 8 | 9 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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