Surf Forecasts:
Sao Juliao surf forecast from 5 Aug 2026:
- Most powerful swell: Friday 7 Aug, 1AM (local time) - 4.5ft (1.4m), 8s period, NNW swell with 250 kJ wave energy.
Best Forecast Surf Conditions for Sao Juliao this week:
The most powerful waves expected at Sao Juliao in the next 16 days are 1.4m 8s and forecast to arrive on Friday (Aug 07) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Fri 7th Aug) | 4.5ft (1.4m) 8s |
Table - best surf conditions forecast for Sao Juliao over the next 16 days.
The Lowdown
Alright, Rusty here. Gotta be straight with you – it's a tough stretch ahead for Sao Juliao. The whole 16-day window is a write-off, my friend. There isn't a single session I'd recommend paddling out for. The entire run is plagued by that nasty cross-onshore wind, which is just chopping everything up. From Wednesday the 5th through to Thursday the 20th of August, it's all "poor surf conditions."
We start off on Wednesday afternoon with a weak 3ft NNW swell, but that 25 km/h cross-on wind makes it a messy affair. The water's at 68°F, which is about average for the time of year. Thursday the 6th sees a bit more size at 4ft, but the period drops to a weak 8 seconds with even stronger wind. The combined energy hits the 200s (288 on Thursday morning), which is moderate, but it doesn't mean a thing with that wind. That same pattern of poor quality, cross-on wind, and choppy, lumpy conditions just carries on day after day.
There's a brief moment around Monday the 17th afternoon where the swell jumps to 5ft from the NW and the energy gets strong (487), but it's still got a fresh cross-onshore breeze on it. That's too big and blown out for a beginner-friendly spot like this. Honestly, the setup looks more interesting for kite surfing than paddle surfing right now. We don't get a single break in the wind until the very last entry on Thursday the 20th, which finally shows a cross wind, but even then it's still a 5ft mess with a short period and a score of zero.
It's a blank run, plain and simple. For this area, a stretch like this is pretty normal when the winds don't co-operate. Don't force it – forecasts can change, but right now, leave the boards in the van.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Thu afternoon, min 18°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sat afternoon, min 18°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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 10 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | N 8 | N 8 | W 7 | NW 11 | W 7 | WNW 7 | NNW 8 | NNW 8 | NW 9 | NNW 12 | NNW 6 | WNW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 117 | 101 | 227 | 221 | 250 | 207 | 180 | 120 | 63 | 33 | 37 | 35 | 39 | 51 | 48 | 54 | 21 | 59 | 74 | 102 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 8:02PM2.45m | 8:38AM2.33m | 9:08PM2.30m | 9:51AM2.28m | 10:33PM2.23m | 11:16AM2.33m | 00:00AM2.29m | 12:33PM2.50m | 1:13AM2.45m | 1:37PM2.74m | 2:11AM2.63m | 2:30PM2.98m | 3:01AM2.79m | |||||||
Low Tide | 2:17AM0.64m | 2:47PM0.76m | 3:24AM0.77m | 4:09PM0.82m | 4:48AM0.82m | 5:40PM0.74m | 6:12AM0.73m | 6:58PM0.54m | 7:19AM0.55m | 7:59PM0.31m | 8:14AM0.36m | 8:50PM0.09m | ||||||||
 |  | | | | | | | | | | | | | | | | | | | |
 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:47 | — | — |
 | 8:45 | — | — | 8:44 | — | — | 8:43 | — | — | 8:40 | — | — | 8:39 | — | — | 8:38 | — | — | 8:37 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 19 | 21 | 22 | 19 | 22 | 22 | 20 | 22 | 23 | 21 | 22 | 22 | 20 | 22 | 22 | 19 | 22 | 22 | 19 |
Feels °C | 19 | 17 | 17 | 19 | 17 | 20 | 20 | 19 | 21 | 22 | 21 | 21 | 21 | 20 | 21 | 21 | 18 | 21 | 20 | 18 |
Swell 1 Height (m) Direction Period (s) | NNW 10 | NNW 9 | W 10 | W 10 | W 10 | W 9 | W 9 | W 9 | N 8 | N 8 | W 7 | W 7 | W 7 | WNW 7 | W 7 | W 6 | W 6 | NNW 12 | NNW 11 | WNW 10 |
| kJ | 117 | 101 | 49 | 49 | 46 | 43 | 42 | 40 | 63 | 31 | 37 | 35 | 35 | 51 | 33 | 20 | 12 | 59 | 74 | 102 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | W 10 | WNW 7 | S 12 | SW 13 | S 13 | S 12 | S 12 | WNW 9 | W 8 | NNW 12 | NW 11 | NNW 10 | NW 9 | NNW 8 | NW 10 | NNW 7 | WNW 10 | WNW 11 | NNW 10 |
| kJ | 37 | 73 | 9 | 3 | 7 | 3 | 3 | 3 | 26 | 33 | 14 | 30 | 39 | 42 | 48 | 24 | 20 | 19 | 41 | 59 |
Swell 3 Height (m) Direction Period (s) | SW 12 | SW 12 | S 12 | — | — | — | — | — | S 12 | S 12 | S 11 | S 11 | S 11 | N 7 | W 11 | NW 11 | NW 9 | W 6 | WNW 9 | NNW 8 |
| kJ | 6 | 6 | 3 | — | — | — | — | — | 3 | 3 | 2 | 2 | 2 | 1 | 2 | 5 | 21 | 6 | 8 | 6 |
Wind waves Height (m) Direction Period (s) | WNW 7 | NNW 4 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | — | NW 3 | NNW 7 | N 7 | NW 3 | — | NNW 3 | NNW 8 | NNW 4 | NNW 5 | NNW 6 | NNW 5 |
| kJ | 47 | 17 | 227 | 221 | 250 | 207 | 180 | 120 | — | 2 | 16 | 8 | 2 | — | 3 | 54 | 20 | 41 | 60 | 36 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 30 | 26 | 231 | 454 | 231 | 145 | 432 | 105 | 44 | 411 | 29 | 29 | 449 | 26 | 26 | 449 | 275 | 145 | 406 | 26 |
Best forecast wave conditions in Ericeira | ||||||||||||||||||||
Best forecast wave conditions in Portugal | ||||||||||||||||||||
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Information about the Sao Juliao Surf forecast
The above surf forecast table for Sao Juliao provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sao Juliao can be found by selecting the local surf guide option on the grey menu. Our Sao Juliao 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 (Sao Juliao) 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 Sao Juliao 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.
Sao Juliao is 15 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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