Surf Forecasts:
Sao Juliao surf forecast from 4 Aug 2026:
- Most powerful swell: Friday 7 Aug, 7AM (local time) - 6ft (1.8m), 8s period, NNW swell with 368 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 1.8m 8s and forecast to arrive on Friday (Aug 07) at 7AM. 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 | 7AM (Fri 7th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Sao Juliao over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at the surf for the next couple of weeks.
Looking at the whole picture, it’s a bit of a flat, windswept stretch for the most part. We’ve got a long gap at the start with pretty much nothing on offer. The first week is a write-off, to be honest. From Tuesday the 4th through to Friday the 15th, it’s all small, short-period, wind-blown slop. There’s a stretch of poor conditions with chop and lumpy seas. Even with a couple of small pulses, the onshore winds just kill it. You’d be fighting a losing battle out there.
The waves that do show are small, mostly under 3ft, and the wind is cross-onshore from the north, which is never good for a beach break. The water temp is around 67°, which is about average for this time of year, so nothing crazy there.
There is a bit of a change on the horizon. From Monday the 16th, things start to look a little more interesting. The swell starts to pick up a bit. The combined energy jumps up to 378 on Monday morning, and then it really kicks in that afternoon with a strong 862. The swell is still from the NW, but it's got more size, around 5ft to 7ft. The wind is still cross-onshore, but lighter, especially on Monday morning with a gentle breeze. That's about the best we see, although it's still not perfect. That bigger swell on Monday afternoon is getting into the too-messy territory. It's a similar story on Tuesday the 17th, with a bit of a drop in size but still some energy there.
Honestly, the pick of the bunch looks like Monday the 16th morning. It’s not a classic, but there’ll be some rideable waves and less wind mess. With the swell at 5ft and a cross-shore breeze, you might find a few corners on the inside. As for the rest, it’s mainly a cross-onshore mess, especially with that 25 mph wind on the final Wednesday. This stretch might be more interesting for the kite surfers than for paddle surfers, to be honest. It’s a pretty bleak outlook until that last stand-out session.
Stay stoked.
Short Range ForecastMostly dry. Warm (max 22°C on Tue morning, min 18°C on Wed night). Winds increasing (light winds from the WNW on Tue morning, fresh winds from the NNW by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Fri morning, min 18°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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) | WNW 9 | WNW 8 | WNW 8 | WNW 8 | NNW 10 | NNW 9 | NNW 7 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 6 | NNW 8 | NNW 7 | W 8 | WNW 7 | W 7 | W 7 | NNW 5 | NNW 6 | NNW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 129 | 118 | 90 | 75 | 117 | 301 | 281 | 273 | 281 | 365 | 276 | 127 | 94 | 57 | 33 | 48 | 42 | 37 | 24 | 58 | 140 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | 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 | 7:11PM2.61m | 7:40AM2.43m | 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 | ||||||||
Low Tide | 12:54PM0.52m | 1:25AM0.50m | 1:43PM0.64m | 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 | ||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — |
 | — | 8:45 | — | — | 8:45 | — | — | 8:44 | — | — | 8:43 | — | — | 8:40 | — | — | 8:39 | — | — | 8:38 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 22 | 21 | 21 | 21 | 19 | 21 | 21 | 19 | 21 | 21 | 19 | 21 | 21 | 20 | 21 | 21 | 20 | 21 | 21 | 19 |
Feels °C | 23 | 21 | 22 | 19 | 18 | 16 | 17 | 17 | 16 | 19 | 18 | 17 | 20 | 20 | 21 | 21 | 19 | 19 | 18 | 18 | 17 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 8 | WNW 8 | WNW 8 | NNW 10 | W 10 | W 10 | W 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | NNW 8 | NNW 7 | NNW 7 | WNW 7 | W 7 | W 7 | W 7 | W 7 | NNW 13 |
| kJ | 129 | 118 | 90 | 69 | 117 | 100 | 49 | 48 | 29 | 28 | 28 | 26 | 94 | 57 | 30 | 48 | 33 | 37 | 24 | 23 | 140 |
Swell 2 Height (m) Direction Period (s) | NNW 8 | NNW 11 | NNW 11 | NNW 9 | W 7 | SW 12 | WNW 6 | S 12 | SW 13 | S 13 | S 12 | S 12 | WNW 9 | WNW 9 | W 8 | NW 11 | NNW 10 | NNW 10 | NW 9 | NNW 14 | W 6 |
| kJ | 6 | 13 | 64 | 75 | 27 | 6 | 8 | 3 | 7 | 3 | 3 | 3 | 26 | 25 | 33 | 31 | 42 | 37 | 20 | 21 | 30 |
Swell 3 Height (m) Direction Period (s) | S 13 | N 8 | SW 12 | WNW 10 | WNW 10 | — | S 12 | — | — | — | — | S 12 | S 12 | N 11 | NW 12 | N 7 | S 11 | S 11 | NW 11 | NNW 10 | NW 7 |
| kJ | 3 | 1 | 6 | 34 | 37 | — | 3 | — | — | — | — | 3 | 3 | 2 | 6 | 8 | 2 | 2 | 5 | 10 | 13 |
Wind waves Height (m) Direction Period (s) | — | — | NW 3 | NNW 3 | NNW 4 | NNW 9 | NNW 7 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 6 | — | NW 3 | — | N 4 | NNW 3 | NNW 4 | NNW 5 | NNW 6 | NNW 5 |
| kJ | — | — | 4 | 3 | 11 | 301 | 281 | 273 | 281 | 365 | 276 | 127 | — | 2 | — | 3 | 7 | 12 | 24 | 58 | 33 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 26 | 215 | 38 | 26 | 549 | 270 | 231 | 553 | 125 | 145 | 981 | 145 | 44 | 558 | 27 | 44 | 1604 | 139 | 237 | 554 | 145 |
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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