Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
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Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 11 pm Monday 15 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
10.7° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 6AM is: 1.7m 15s primary swell from a Northwest direction (forecast issued at 11:00pm December 15). The wind direction is predicted to be cross-offshore and the swell rating is 4.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Dec) | 5ft (1.6m) | 15s |
| Afternoon (16 Dec) | 4.5ft (1.4m) | 14s |
| Evening (16 Dec) | 4.5ft (1.4m) | 14s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| 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) (?) | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 21 | 21 | 21 | 20 | 19 | 19 | 19 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1694 | 1486 | 1361 | 1271 | 1059 | 1031 | 846 | 822 | 765 | 607 | 479 | 357 | 351 | 346 | 261 | 357 | 777 | 6252 | 9935 | 10031 | 8784 | 7202 | 6645 | 5981 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | cross- off | cross- off | cross- off | off | off | off | off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | off | off | off | off |
High Tide / height (m) | 3:45AM 1.34 | 3:55PM 1.42 | 4:22AM 1.44 | 4:32PM 1.45 | 4:56AM 1.53 | 5:06PM 1.48 | ||||||||||||||||||
Low Tide / height (m) | 9:40PM 0.47 | 9:52AM 0.50 | 10:18PM 0.41 | 10:39AM 0.44 | 10:53PM 0.36 | 11:20AM 0.38 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:47 | - | - | - | - | - | - | - | 8:48 | - | - | - | - | - | - | - | 8:48 | - | - | - |
| Sunset | - | - | - | - | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - | - | - | - | - | - | - | 3:56 | - |
 |  |  | |  | | | | | | | |  |  | | | |  | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 1 | - | - | 1 | - | - | - | - | - | - |
| Temp. °C | 8 | 7 | 6 | 6 | 6 | 6 | 5 | 6 | 6 | 5 | 4 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 9 | 8 | 7 | 6 | 6 | 8 |
| Feels °C (?) | 5 | 3 | 2 | 2 | 2 | 1 | 0 | 1 | 1 | 0 | -2 | -3 | -3 | -2 | 2 | 6 | 6 | 3 | 2 | 1 | 1 | 1 | 0 | 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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