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Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 pm Sunday 07 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 1AM is: 0.4m 13s primary swell from a West-northwest direction and 0.4m 6s secondary swell from a Northwest direction (forecast issued at 11:00pm December 07). An open ocean swell of 0.3m 2s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (08 Dec) | 2ft (0.6m) | 21s |
| Afternoon (08 Dec) | 4ft (1.2m) | 18s |
| Evening (08 Dec) | 4.5ft (1.3m) | 17s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 08 | Tuesday 09 | Wednesday 10 | ||||||||||||||||||||||
| 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 | 9 AM | 12 PM | 3 PM | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 13 | 13 | 13 | 23 | 21 | 20 | 18 | 18 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 14 | 13 | 11 | 10 | 12 | 12 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 67 | 66 | 93 | 87 | 361 | 746 | 957 | 1172 | 986 | 838 | 683 | 525 | 447 | 382 | 306 | 405 | 1053 | 888 | 412 | 347 | 714 | 893 | 1174 | 1367 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | off | cross- off | cross- off | off | cross- off | off | off | cross- off | cross- off | cross- off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 7:34PM 1.56 | 8:02AM 1.88 | 8:18PM 1.42 | 8:54AM 1.79 | 9:05PM 1.28 | 9:51AM 1.68 | ||||||||||||||||||
Low Tide / height (m) | 1:47AM 0.16 | 2:48PM 0.26 | 2:32AM 0.22 | 3:45PM 0.38 | 3:21AM 0.30 | 4:47PM 0.50 | ||||||||||||||||||
Monday 08 | Tuesday 09 | Wednesday 10 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:37 | - | - | - | - | - | - | - | 8:38 | - | - | - | - | - | - | - | 8:41 | - | - | - |
| Sunset | - | - | - | - | - | - | 3:57 | - | - | - | - | - | - | - | 3:57 | - | - | - | - | - | - | - | 3:57 | - |
 |  |  |  |  |  | | | | |  |  |  | | | | | | | | | | | | |
Rain (mm) | - | - | - | 4 | - | - | - | - | - | - | 1 | 7 | 5 | 1 | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 8 | 8 | 9 | 9 | 10 | 10 | 9 | 8 | 8 | 10 | 12 | 14 | 15 | 11 | 10 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 11 |
| Feels °C (?) | 4 | 3 | 3 | 2 | 1 | 3 | 3 | 4 | 4 | 3 | 4 | 3 | 7 | 4 | -1 | 0 | -2 | 0 | 0 | 0 | -1 | -1 | 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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