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Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 am Friday 12 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 3PM is: 2.2m 18s primary swell from a Northwest direction (forecast issued at 11:00am December 12). The wind direction is predicted to be cross-offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Dec) | 8ft (2.4m) | 18s |
| Afternoon (12 Dec) | 7ft (2.2m) | 18s |
| Evening (12 Dec) | 6ft (1.9m) | 17s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||||||||
| 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) (?) | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 14 | 14 | 13 | 13 | 13 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 3422 | 3539 | 3028 | 2600 | 2212 | 2454 | 2810 | 2756 | 2157 | 1647 | 1480 | 1349 | 1311 | 1019 | 732 | 581 | 563 | 607 | 802 | 732 | 854 | 933 | 990 | 1115 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | cross- off | cross- off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | off | off | cross- off | cross- off | cross | glass | cross | off | cross- off | cross- on |
High Tide / height (m) | 12:11PM 1.47 | 12:40AM 1.06 | 1:25PM 1.42 | 2:03AM 1.12 | 2:26PM 1.40 | 3:01AM 1.23 | ||||||||||||||||||
Low Tide / height (m) | 7:00PM 0.60 | 6:30AM 0.55 | 8:04PM 0.58 | 7:46AM 0.57 | 8:56PM 0.53 | |||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||||||||
| Sunrise | 8:42 | - | - | - | - | - | - | - | 8:44 | - | - | - | - | - | - | - | 8:45 | - | - | - | - | - | - | - |
| Sunset | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - | - | - | - | - |
 | |  |  | | | |  |  | |  |  | | | | | | | |  | |  | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | - | 1 | 1 | 4 | 3 | 4 | 6 | 3 | 4 |
| Temp. °C | 6 | 7 | 8 | 8 | 7 | 6 | 7 | 7 | 8 | 9 | 10 | 11 | 12 | 12 | 12 | 13 | 13 | 13 | 11 | 9 | 9 | 11 | 11 | 8 |
| Feels °C (?) | 1 | 1 | 2 | 1 | 2 | 0 | 1 | 0 | 0 | 0 | 1 | 2 | 3 | 5 | 6 | 6 | 7 | 8 | 8 | 8 | 7 | 7 | 8 | 0 |
- 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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