Backdoor surfForecast / Ericeira / Portugal

information circle12 Day Weather and Surf, issued 6 pm Thursday 02 Oct 2025 WEST
Forecast 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
17.2° C
(Which is 2.7°C colder than average for this time of year)


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 Friday (Oct 03) at 1AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.6m and 13s. Another secondary swell of 0.6m and 4s is also forecast. 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 2.5m 13s and forecast to arrive on Monday (Oct 06) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Sunday (Oct 05) at 4AM.

Wave TypeTime (WEST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Fri 3rd Oct)3ft (0.9m) 10s
Best Surf 1AM (Mon 6th Oct)8ft (2.5m) 13s
Most Powerful 1AM (Mon 6th Oct)8ft (2.5m) 13s

Table - best surf conditions forecast for Backdoor over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 20°C on Thu afternoon, min 15°C on Sat night). Mainly fresh winds.

Days 3-6 Weather Summary Mostly dry. Warm (max 23°C on Mon morning, min 17°C on Sun afternoon). Wind will be generally light.

Thu
02
Friday
03
Saturday
04
Sunday
05
Monday
06
Tuesday
07
Wednesday
08
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
2
2
0
0
0
0
0
2
2
4
4
2
4
3
2
3
2
0
2
1
Swell
Height Map
Wave Height (m) & direction (?)
1.1
NW
0.9
WNW
1.1
NW
1.1
NW
1
NW
1
NW
1
NW
1.3
NW
2.3
NW
1.6
WNW
2.5
NNW
2.2
NNW
2
NNW
1.2
W
1.3
W
1.3
W
1.7
WNW
1.7
WNW
1.6
WNW
1.6
WNW
1.5
NW
Period(s) (?)111012111010101412141312121514131513131211
Wave
Graph
(?)Metric surfscale
Energy kJ (?)26818235530821619218164715699612113140710806366845911174960825734553
Wind
(km/h)
20
NNW
15
N
15
N
25
NNW
20
N
25
N
30
NNW
35
N
25
N
25
NNW
15
NNE
15
SE
10
SW
5
NE
5
N
20
NNW
20
N
20
N
25
N
20
N
15
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
off
cross-
off
crosscrosscrosscrosscrosscrosscrosscross-
off
cross-
off
cross-
on
cross-
off
crosscrosscross-
off
crosscrosscrosscross
High Tide
/ height (m)
12:29AM
2.15
12:43PM
2.46
1:14AM
2.40
1:26PM
2.72
1:54AM
2.65
2:06PM
2.97
2:32AM
2.88
2:45PM
3.16
3:11AM
3.05
3:26PM
3.26
3:49AM
3.14
4:07PM
3.25
4:30AM
3.14
Low Tide
/ height (m)
6:19PM
0.83
6:28AM
0.83
7:05PM
0.56
7:13AM
0.58
7:44PM
0.29
7:54AM
0.33
8:22PM
0.05
8:33AM
0.12
9:00PM
-0.12
9:13AM
-0.04
9:38PM
-0.19
9:54AM
-0.11
10:17PM
-0.14
10:37AM
-0.09
Thu
02
Friday
03
Saturday
04
Sunday
05
Monday
06
Tuesday
07
Wednesday
08
Sunrise--7:33--7:35--7:35--7:37--7:37--7:39--7:39
Sunset7:19--7:17--7:15--7:15--7:13--7:12--7:09--
clear
clear
clear
clear
part cloud
clear
clear
part cloud
cloud
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
clear
part cloud
clear
Rain (mm)
---------------------
Temp. °C201719191618191718182123232122211919181618
Feels °C (?)171516161415161416152021232320191716151417
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Ericeira

  1. weather stationWind Update The wind is still cross-on at Backdoor (moderate winds from the NNW at Sintra/Granja 13 km from Backdoor). 0.9m 11s groundswell from the WNW with a 0.6m 5s windswell from the NNW. 2 swells combining to make bigger set waves.

    Backdoor
Expand
<
>
View all

3 h 28 min ago

25 km/h
NNW
Cross-On
Please reload the page to see if there are any updates.

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.

Nearest
Nearest
Nearest