Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Castlerock surfForecast / Londonderry / Ireland
48hr Weather and Surf, issued 5 pm Friday 19 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
10.6° C
(Which is slightly warmer than usual)How big are the waves at Castlerock today?
The current surf forecast for Castlerock at 11PM is: 2.1m 14s primary swell from a Northwest direction (forecast issued at 05:00pm December 19). The wind direction is predicted to be offshore and the swell rating is 4.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 Dec) | - | - |
| Afternoon (19 Dec) | 8ft (2.5m) | 16s |
| Evening (19 Dec) | 7ft (2.2m) | 15s |
Table - waves today at Castlerock. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||||||
| 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 | 9 AM | 12 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 16 | 15 | 15 | 14 | 13 | 13 | 13 | 12 | 12 | 13 | 12 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 14 | 14 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 3211 | 2906 | 2027 | 1558 | 1006 | 680 | 405 | 287 | 260 | 212 | 159 | 437 | 793 | 1384 | 1901 | 1992 | 1685 | 1494 | 1138 | 998 | 716 | 577 | 437 | 321 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | 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 | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross- off | off |
High Tide / height (m) | 5:39PM 1.50 | 6:02AM 1.66 | 6:11PM 1.52 | 6:36AM 1.70 | 6:42PM 1.51 | 7:12AM 1.71 | ||||||||||||||||||
Low Tide / height (m) | 12:01AM 0.27 | 12:34PM 0.33 | 12:34AM 0.23 | 1:10PM 0.35 | 1:06AM 0.21 | |||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 8:49 | - | - | - | - | - | - | - | 8:49 | - | - | - | - | - | - | - | 8:51 | - |
| Sunset | 3:57 | - | - | - | - | - | - | - | 3:57 | - | - | - | - | - | - | - | 3:57 | - | - | - | - | - | - | - |
 |  |  | | | | |  |  |  | | | | | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | 1 | 2 | 1 | 4 | - | - | - | - | 1 | 2 | - | 1 | 2 | 2 | 1 |
| Temp. °C | 9 | 7 | 6 | 6 | 6 | 7 | 8 | 9 | 9 | 8 | 8 | 8 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 8 | 9 |
| Feels °C (?) | 2 | 1 | 1 | 1 | 0 | 1 | 0 | -1 | -1 | -2 | -1 | 0 | 2 | 2 | 3 | 3 | 3 | 4 | 3 | 3 | 5 | 6 | 6 | 7 |
- 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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