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Backdoor surfForecast / Ericeira / Portugal
12 Day Weather and Surf, issued 11 pm Monday 17 Nov 2025 WET
Best Forecast Surf Conditions for Backdoor this week:
The surf forecast for Backdoor over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Nov 18) at 9AM. The primary swell is predicted to be 1.8m and 8s period with a secondary swell of 0.6m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Backdoor in the next 12 days are 3.0m 10s and forecast to arrive on Tuesday (Nov 25) at 3AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 12s period and expected on Wednesday (Nov 19) at 9AM.
| Wave Type | Time (WET) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Tue 18th Nov) | 6ft (1.8m) 8s |
| Best Surf | 6AM (Tue 25th Nov) | 8ft (2.5m) 10s |
| Most Powerful | 3AM (Tue 25th Nov) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Backdoor over the next 12 days.
Short Range Forecast Mostly dry. Very mild (max 17°C on Tue afternoon, min 12°C on Thu afternoon). Winds increasing (light winds from the NE on Tue morning, fresh winds from the N by Thu morning). | Days 3-6 Weather Summary Mostly dry. Very mild (max 16°C on Sun morning, min 10°C on Thu night). Winds decreasing (fresh winds from the NNE on Thu night, calm by Sat morning). | |||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Mon 24 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 9 | 8 | 8 | 7 | 6 | 6 | 7 | 8 | 8 | 9 | 8 | 8 | 13 | 13 | 13 | 13 | 12 | 12 | 8 | 9 | 9 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 686 | 466 | 221 | 117 | 129 | 176 | 284 | 408 | 662 | 1047 | 535 | 356 | 458 | 468 | 538 | 411 | 308 | 298 | 250 | 470 | 673 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross | cross | cross | cross | cross- off | cross- off | cross | cross- off | cross- off | cross- off | cross- off | glass | cross | cross | cross- on | cross- on | cross- on | on | on | |
High Tide / height (m) | 1:09AM 2.61 | 1:24PM 2.61 | 1:42AM 2.69 | 1:58PM 2.63 | 2:13AM 2.74 | 2:32PM 2.62 | 2:46AM 2.75 | 3:05PM 2.58 | 3:19AM 2.72 | 3:39PM 2.50 | 3:53AM 2.66 | 4:15PM 2.41 | 4:30AM 2.58 | 4:52PM 2.30 | ||||||||
Low Tide / height (m) | 7:16AM 0.48 | 7:29PM 0.42 | 7:49AM 0.41 | 8:00PM 0.40 | 8:22AM 0.37 | 8:32PM 0.41 | 8:56AM 0.37 | 9:04PM 0.45 | 9:30AM 0.42 | 9:37PM 0.52 | 10:06AM 0.50 | 10:12PM 0.60 | 10:45AM 0.60 | |||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Mon 24 | ||||||||||||||||
| Sunrise | - | 7:22 | - | - | 7:24 | - | - | 7:24 | - | - | 7:26 | - | - | 7:26 | - | - | 7:28 | - | - | 7:28 | - | |
| Sunset | - | - | 5:22 | - | - | 5:21 | - | - | 5:20 | - | - | 5:20 | - | - | 5:19 | - | - | 5:19 | - | - | 5:17 | |
 |  | |  |  |  | | | | | | | | | | | | | | | | ||
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Temp. °C | 15 | 16 | 17 | 15 | 15 | 15 | 14 | 13 | 13 | 13 | 12 | 13 | 12 | 12 | 14 | 15 | 16 | 16 | 16 | 16 | 17 | |
| Feels °C (?) | 12 | 13 | 14 | 13 | 10 | 9 | 9 | 6 | 6 | 6 | 5 | 6 | 8 | 10 | 11 | 12 | 15 | 14 | 15 | 13 | 14 | |
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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 Backdoor 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.
Information about the Backdoor Surf forecast
The above surf forecast table for Backdoor provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Backdoor can be found by selecting the local surf guide option on the grey menu. Our Backdoor surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Backdoor) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Backdoor may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Backdoor is 14 km (9 miles) from the city of Sintra. If you plan a holiday in Ericeira, look for hotels and other accommodation in Sintra. Sintra has rooms for a wide range of budgets as well as car hire and transport links.
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