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:
Backdoor surfForecast / Ericeira / Portugal
48hr Weather and Surf, issued 11 am Wednesday 17 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 normal for this time of year)How big are the waves at Backdoor today?
The current surf forecast for Backdoor at 4PM is: 3.0m 13s primary swell from a Northwest direction (forecast issued at 11:00am December 17). The wind direction is predicted to be cross-shore.
| Time (WET) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 11ft (3.5m) | 13s |
| Afternoon (17 Dec) | 10ft (3.0m) | 13s |
| Evening (17 Dec) | 8ft (2.5m) | 13s |
Table - waves today at Backdoor. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | |||||||||||||||||||||
| 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 | 3 AM | 6 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 24 | 22 | 21 | 19 | 19 | 18 | 17 | 17 | 16 | 17 | 16 | 16 | 17 | 17 | 17 | 17 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 4313 | 3597 | 3123 | 2537 | 2185 | 1839 | 1810 | 4440 | 19184 | 17640 | 20604 | 19971 | 16819 | 16272 | 14976 | 11712 | 13319 | 10908 | 12305 | 13127 | 13359 | 12591 | 10790 | 8472 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | glass | cross- off | cross- off | cross- off | cross- off | cross | cross | cross | cross | cross- on | cross | cross | cross | cross | cross | cross | cross | cross | cross- on | cross- on |
High Tide / height (m) | 1:01PM 2.38 | 1:20AM 2.55 | 1:41PM 2.45 | 1:57AM 2.64 | 2:18PM 2.50 | 2:33AM 2.70 | ||||||||||||||||||
Low Tide / height (m) | 6:53AM 0.66 | 7:04PM 0.62 | 7:32AM 0.56 | 7:41PM 0.56 | 8:09AM 0.48 | 8:17PM 0.51 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | |||||||||||||||||||||
| Sunrise | 7:50 | - | - | - | - | - | - | - | 7:50 | - | - | - | - | - | - | - | 7:50 | - | - | - | - | - | - | - |
| Sunset | - | - | 5:16 | - | - | - | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:16 | - | - | - | - | - |
 |  | |  |  | | | | | | | |  |  | | | | | |  | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 6 | 2 | 2 | - | - | - | - | - | - | - | - |
| Temp. °C | 13 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 13 | 15 | 15 | 15 | 15 | 15 | 14 | 13 | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 13 |
| Feels °C (?) | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 10 | 10 | 11 | 9 | 9 | 9 | 11 | 11 | 6 | 6 | 7 | 7 | 7 | 6 | 6 | 9 | 9 |
- 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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