Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Castletown surfForecast / Isle of Man / UK
48hr Weather and Surf, issued 5 pm Wednesday 10 Dec 2025 GMTForecast update in hr min s Forecast update imminent
Castletown surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castletown sea temperature is
11.7° C
(Which is 1.5°C warmer than normal for this time of year)How big are the waves at Castletown today?
The current surf forecast for Castletown at 1AM is: 3.0m 8s primary swell from a South-southwest direction (forecast issued at 05:00pm December 10). The wind direction is predicted to be cross-onshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 11ft (3.5m) | 9s |
| Afternoon (11 Dec) | 11ft (3.5m) | 9s |
| Evening (11 Dec) | 6.5ft (2.0m) | 8s |
Table - waves today at Castletown. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| 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) (?) | 7 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 4 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 625 | 452 | 467 | 752 | 1573 | 2007 | 2012 | 2165 | 1774 | 1147 | 511 | 264 | 153 | 136 | 47 | 128 | 166 | 246 | 254 | 362 | 565 | 1383 | 1254 | 1516 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on | on | cross- off | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | cross- on | cross- on |
High Tide / height (m) | 3:09PM 4.97 | 3:54AM 4.43 | 4:08PM 4.75 | 4:57AM 4.23 | 5:11PM 4.56 | 6:03AM 4.14 | ||||||||||||||||||
Low Tide / height (m) | 9:34PM 0.97 | 9:49AM 1.53 | 10:36PM 1.17 | 10:52AM 1.69 | 11:42PM 1.30 | |||||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 8:26 | - | - | - | - | - | - | - | 8:27 | - | - | - | - | - | - | - | 8:29 | - |
| Sunset | 3:56 | - | - | - | - | - | - | - | 3:55 | - | - | - | - | - | - | - | 3:55 | - | - | - | - | - | - | - |
 |  |  | | | | |  | |  | | | |  |  | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | 2 | 1 | 2 | - | - | - | - | - | - | - | - | - | 3 | 1 | 1 |
| Temp. °C | 11 | 11 | 10 | 10 | 11 | 11 | 11 | 12 | 11 | 11 | 8 | 8 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 12 |
| Feels °C (?) | 2 | 2 | 1 | 0 | 0 | 0 | -1 | 1 | 1 | 2 | 3 | 4 | 5 | 4 | 2 | 2 | 3 | 3 | 3 | 2 | 0 | -2 | 3 | 3 |
- 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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