
Surf Forecasts:
Backdoor surf forecast from 3 Jul 2026:
- Best quality surf: Saturday 4 Jul, 1AM (local time) - 2.5ft (0.7m), 11s period, NW swell with glassy winds.
- Most powerful swell: Friday 3 Jul, 1PM (local time) - 5ft (1.6m), 8s period, NNW swell with 370 kJ wave energy.
- Next surfable swell (1★+): Saturday 4 Jul, 1AM (local time) - 2.5ft (0.7m), 11s period with NW swell.
Best Forecast Surf Conditions for Backdoor this week:
The surf forecast for Backdoor over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Jul 04) at 1AM. The primary swell is predicted to be 0.7m and 11s period with a secondary swell of 1.0m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Backdoor in the next 16 days are 1.6m 8s and forecast to arrive on Friday (Jul 03) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 16s period and expected on Friday (Jul 03) at 1PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sat 4th Jul) | 2.5ft (0.7m) 11s |
| Best Surf | 1AM (Sat 4th Jul) | 2.5ft (0.7m) 11s |
| Most Powerful | 1PM (Fri 3rd Jul) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Backdoor over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here again, but in old-school numbers. So, looking at the whole 16 days, it’s a bummer. There’s one real bright spot, and then a whole lot of nothing. The standout is Friday morning, July 3rd. After that, you’re looking at a long, dry spell.
Friday morning, July 3rd is the session to be in the water. Backdoor is cooking. There’s a solid 6ft swell from the NNW with a 9-second period, and the wind is a crisp cross-offshore from the ESE at 9 mph. That wind is going to keep the surface glassy and the waves looking good. The combined swell energy is moderate at 493, so there’s enough push. Water temp is about 64°, which is normal for the season. For a heavy reef break like Backdoor that’s very consistent, this is your one chance. It’s strictly for experienced surfers.
From Friday afternoon all the way to Saturday, July 18th, it’s dead. The surf drops to tiny, junky, or blown-out conditions. Backdoor is a consistent spot, so it’s not the location, it’s just a bad run of weather and swell. There’s a small pulse on the morning of July 12th with 4ft, but the wind is onshore and rough—barely a look. Another bump on the morning of July 13th with 5ft, but it’s the same story: onshore and messy.
So, lock in Friday morning, July 3rd. After that, it’s a 15-day quiet period. Forget about the second week. It’s a wash.
Rusty.
Short Range ForecastMostly dry. Warm (max 31°C on Fri morning, min 22°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Mon morning, min 18°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 3 | Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | NNW 9 | NNW 8 | NW 11 | NNW 8 | NNW 8 | NNW 9 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | NNW 4 | WNW 8 | NNW 4 | NNW 4 | NW 10 | NW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 |
Wave Graph | |||||||||||||||||||||
493 | 232 | 126 | 151 | 123 | 108 | 31 | 27 | 24 | 21 | 20 | 20 | 14 | 9 | 10 | 25 | 23 | 35 | 55 | 54 | 54 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | glassy | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross-off | cross | cross | cross | cross | cross-on | cross-off | cross-on | cross-on | cross-on |
High Tide | 5:46PM2.72m | 6:07AM2.42m | 6:22PM2.67m | 6:45AM2.37m | 7:00PM2.60m | 7:28AM2.33m | 7:44PM2.52m | 8:18AM2.30m | 8:36PM2.44m | 9:17AM2.28m | 9:39PM2.38m | 10:24AM2.31m | 10:52PM2.37m | ||||||||
Low Tide | 11:27AM0.49m | 00:01AM0.46m | 12:03PM0.53m | 00:38AM0.50m | 12:41PM0.60m | 1:18AM0.54m | 1:25PM0.67m | 2:03AM0.59m | 2:17PM0.74m | 2:57AM0.64m | 3:19PM0.79m | 4:01AM0.67m | 4:33PM0.77m | ||||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | |
— | — | 9:06 | — | — | 9:06 | — | — | 9:06 | — | — | 9:06 | — | — | 9:05 | — | — | 9:05 | — | — | 9:05 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 31 | 26 | 25 | 29 | 26 | 24 | 27 | 28 | 24 | 27 | 25 | 21 | 23 | 23 | 19 | 22 | 22 | 19 | 22 | 22 | 19 |
Feels °C | 27 | 25 | 26 | 27 | 25 | 24 | 26 | 25 | 22 | 24 | 22 | 18 | 20 | 20 | 17 | 21 | 21 | 18 | 21 | 21 | 18 |
Swell 1 Height (m) Direction Period (s) | NNW 9 | NNW 8 | NNW 7 | NNW 8 | NNW 8 | NNW 9 | NNW 6 | NW 10 | NW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 8 | WNW 8 | W 8 | NW 10 | NW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 |
493 | 232 | 114 | 151 | 123 | 108 | 23 | 27 | 24 | 18 | 18 | 16 | 14 | 7 | 5 | 25 | 23 | 35 | 55 | 54 | 54 | |
Swell 2 Height (m) Direction Period (s) | S 16 | NW 12 | NW 11 | WNW 11 | WNW 10 | WNW 10 | NW 11 | WNW 9 | WNW 9 | NW 9 | NW 9 | NNW 8 | NNW 8 | NW 8 | NW 11 | W 8 | W 7 | NNW 4 | NNW 6 | NNW 6 | N 6 |
5 | 142 | 126 | 101 | 57 | 38 | 31 | 16 | 16 | 21 | 20 | 7 | 7 | 2 | 5 | 4 | 4 | 2 | 4 | 7 | 3 | |
Swell 3 Height (m) Direction Period (s) | — | S 16 | S 4 | S 4 | — | NNW 12 | WNW 9 | N 8 | W 11 | S 13 | S 11 | S 11 | S 12 | S 12 | NW 8 | NW 7 | NW 7 | W 7 | S 17 | S 16 | S 16 |
— | 5 | 1 | 1 | — | 14 | 17 | 5 | 2 | 3 | 2 | 2 | 3 | 3 | 2 | 2 | 2 | 1 | 6 | 5 | 5 | |
Wind waves Height (m) Direction Period (s) | ESE 3 | — | — | — | — | — | — | NNW 6 | NNW 4 | N 5 | NNW 4 | NNW 4 | NNW 4 | NNW 4 | NNW 4 | NNW 4 | NNW 4 | — | — | — | NW 3 |
1 | — | — | — | — | — | — | 23 | 14 | 15 | 14 | 20 | 11 | 9 | 10 | 4 | 4 | — | — | — | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 49 | 0 | 25 | 182 | 29 | 25 | 45 | 29 | 29 | 590 | 118 | 912 | 1377 | 131 | 412 | 412 | 92 | 26 | 45 | 45 |
Best forecast wave conditions in Ericeira | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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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 16 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.










