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:
Cabo de Sines surfForecast / Alentejo / Portugal
48hr Weather and Surf, issued 5 am Wednesday 17 Dec 2025 WETForecast update in hr min s Forecast update imminent
Cabo de Sines surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cabo de Sines sea temperature is
16.4° C
(Which is slightly cooler than normal)How big are the waves at Cabo de Sines today?
The current surf forecast for Cabo de Sines at 11AM is: 3.0m 14s primary swell from a West-northwest direction (forecast issued at 05:00am December 17). The wind direction is predicted to be offshore and the swell rating is 11.
| Time (WET) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 10ft (3.0m) | 14s |
| Afternoon (17 Dec) | 10ft (3.0m) | 13s |
| Evening (17 Dec) | 8ft (2.4m) | 13s |
Table - waves today at Cabo de Sines. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | Sat 20 | |||||||||||||||||||||
| 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 | 9 PM | 0 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 23 | 21 | 20 | 19 | 19 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 5799 | 4641 | 3692 | 2993 | 2678 | 2231 | 1939 | 1548 | 1453 | 1430 | 4216 | 12875 | 14054 | 13484 | 13172 | 11404 | 11977 | 8620 | 8573 | 8578 | 8028 | 8353 | 8224 | 7953 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross- on | cross- on | on | cross- on | cross- on | cross- on | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 12:39AM 2.93 | 12:57PM 2.85 | 1:17AM 3.02 | 1:36PM 2.89 | 1:53AM 3.10 | 2:13PM 2.92 | ||||||||||||||||||
Low Tide / height (m) | 6:48AM 1.13 | 6:57PM 1.07 | 7:25AM 1.04 | 7:32PM 1.03 | 8:01AM 0.97 | 8:06PM 0.99 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Sat 20 | |||||||||||||||||||||
| Sunrise | - | - | 7:45 | - | - | - | - | - | - | - | 7:45 | - | - | - | - | - | - | - | 7:46 | - | - | - | - | - |
| Sunset | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:17 | - | - | - | - | - | - | - | 5:17 | - | - | - |
 | |  |  | |  | | | | | | | |  | | |  | |  | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 8 | 6 | 1 | - | - | - | - | - |
| Temp. °C | 12 | 11 | 11 | 13 | 14 | 14 | 14 | 14 | 13 | 12 | 12 | 14 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 |
| Feels °C (?) | 6 | 6 | 7 | 10 | 11 | 12 | 13 | 13 | 11 | 10 | 9 | 10 | 11 | 11 | 10 | 10 | 13 | 11 | 9 | 9 | 8 | 8 | 8 | 8 |
- 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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