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 11 pm Thursday 11 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 1.6°C warmer than normal for this time of year)How big are the waves at Castletown today?
The current surf forecast for Castletown at 3AM is: 1.4m 8s primary swell from a South-southwest direction (forecast issued at 11:00pm December 11). An open ocean swell of 0.5m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Dec) | 3ft (0.9m) | 8s |
| Afternoon (12 Dec) | 4ft (1.2m) | 4s |
| Evening (12 Dec) | 4ft (1.2m) | 5s |
Table - waves today at Castletown. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 12 | Saturday 13 | Sunday 14 | ||||||||||||||||||||||
| 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) (?) | 8 | 8 | 8 | 8 | 8 | 8 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 7 | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 804 | 406 | 210 | 130 | 113 | 125 | 54 | 83 | 74 | 89 | 89 | 102 | 249 | 515 | 936 | 1338 | 1647 | 1861 | 2152 | 2410 | 2581 | 2362 | 2265 | 2335 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- off | cross- off | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on |
High Tide / height (m) | 4:57AM 4.23 | 5:11PM 4.56 | 6:03AM 4.14 | 6:17PM 4.44 | 7:07AM 4.15 | |||||||||||||||||||
Low Tide / height (m) | 10:36PM 1.17 | 10:52AM 1.69 | 11:42PM 1.30 | 12:01PM 1.76 | 12:47AM 1.35 | 1:08PM 1.71 | ||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:27 | - | - | - | - | - | - | - | 8:29 | - | - | - | - | - | - | - | 8:30 | - | - | - |
| Sunset | - | - | - | - | - | - | 3:55 | - | - | - | - | - | - | - | 3:55 | - | - | - | - | - | - | - | 3:55 | - |
 |  | |  |  | | |  | | | |  | |  |  | | | | | | | |  | | |
Rain (mm) | 3 | 6 | 1 | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | - | - | 2 | 8 | 2 |
| Temp. °C | 10 | 8 | 8 | 9 | 9 | 10 | 10 | 10 | 9 | 9 | 9 | 10 | 10 | 10 | 9 | 10 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels °C (?) | 4 | 4 | 5 | 6 | 4 | 4 | 4 | 4 | 2 | 2 | 2 | 2 | 1 | -1 | -3 | -2 | -2 | 0 | 1 | 1 | 0 | 0 | 0 | 1 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
Buy Less, Surf More This Black Friday
Surf-forecast is providing a free, all-access pass to our premium features and 12-day forecasts all weekend.
Quiksilver Teams Up With PrimaLoft® For World’s First Thermal Layering System for a Wetsuit.
Previously used in our snow jackets for mountain conditions, PrimaLoft® technology is making its debut in the surf industry. The aim is to bring mountain-grade warmth to the waves.
Vancouver Island’s Day Of Days With Reed Platenius
Surf-Forecast recently helped the 21-year-old Canadian pro surfer and adventurer score some cold water perfection at home.
Read more
Discover more articles and updates in the Greenroom.
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castletown surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Nearest