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:
Backdoor surfForecast / Ericeira / Portugal
48hr Weather and Surf, issued 5 am Saturday 13 Dec 2025 WETForecast update in hr min s Forecast update imminent
Backdoor surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Backdoor sea temperature is
16.1° C
(Which is slightly cooler than normal)How big are the waves at Backdoor today?
The current surf forecast for Backdoor at 12PM is: 4.5m 17s primary swell from a Northwest direction (forecast issued at 05:00am December 13). The wind direction is predicted to be offshore.
| Time (WET) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | 16ft (5.0m) | 17s |
| Afternoon (13 Dec) | 13ft (4.0m) | 16s |
| Evening (13 Dec) | 11ft (3.5m) | 15s |
Table - waves today at Backdoor. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tue 16 | |||||||||||||||||||||
| 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) (?) | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 18252 | 16742 | 13756 | 11118 | 8174 | 6849 | 5603 | 4135 | 3544 | 3025 | 2254 | 1847 | 1952 | 2140 | 2379 | 2609 | 2430 | 2494 | 2244 | 2026 | 1960 | 1820 | 1872 | 2088 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | glass | cross | cross- on | cross- off | cross- on | cross- on | cross |
High Tide / height (m) | 9:33AM 2.29 | 10:17PM 2.16 | 10:35AM 2.25 | 11:13PM 2.24 | 11:31AM 2.27 | 12:00AM 2.34 | ||||||||||||||||||
Low Tide / height (m) | 3:14AM 0.93 | 4:01PM 0.79 | 4:22AM 0.92 | 4:56PM 0.78 | 5:21AM 0.86 | 5:44PM 0.75 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tue 16 | |||||||||||||||||||||
| Sunrise | - | - | 7:47 | - | - | - | - | - | - | - | 7:48 | - | - | - | - | - | - | - | 7:48 | - | - | - | - | - |
| Sunset | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:15 | - | - | - |
 | |  |  | |  | | | | | | | | | | | | |  | |  |  |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 | 11 | 1 | 1 |
| Temp. °C | 13 | 13 | 13 | 14 | 16 | 15 | 14 | 13 | 12 | 11 | 11 | 14 | 15 | 14 | 13 | 13 | 12 | 12 | 12 | 14 | 12 | 14 | 14 | 12 |
| Feels °C (?) | 8 | 8 | 7 | 9 | 12 | 10 | 9 | 8 | 8 | 7 | 7 | 9 | 11 | 11 | 11 | 10 | 10 | 11 | 9 | 11 | 8 | 8 | 7 | 6 |
- 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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