Surf Forecasts:
Sao Joao surf forecast from 4 Aug 2026:
- Most powerful swell: Friday 7 Aug, 10AM (local time) - 6ft (1.8m), 8s period, NNW swell with 378 kJ wave energy.
Best Forecast Surf Conditions for Sao Joao this week:
The most powerful waves expected at Sao Joao in the next 16 days are 1.8m 8s and forecast to arrive on Friday (Aug 07) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Fri 7th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Sao Joao over the next 16 days.
The Lowdown
Alright folks, Rusty here, taking a look at what's on the table for the next couple of weeks. Honestly, it's a bit of a quiet stretch for the most part, but there's a window of hope for those who can wait.
Right off the bat, things are looking pretty average. The water temp at São João is sitting at 67°, which is about 2° cooler than usual for this time of year, so nothing wild, just a touch on the fresh side. The first recommendation doesn't come up until the 16th, so we're looking at more than a week of pretty ordinary conditions. The energy in the water stays weak, barely cracking three digits, and the wind is relentless from the north-northwest, keeping things choppy and messy.
Now, let's talk about the one real standout. The best surf on offer is on Monday, 17th August. The morning session is where it's at. We've got a clean 6ft swell rolling in from the NNW, with a moderate wave energy of 556. The wind is glassy—just a slight air, which is a massive plus. It's a fairly consistent break, and the swell direction is a solid match for what this spot likes. The period is a short 9 seconds, so it's wind swell, but with that glassy surface, it should still be a lot of fun. Just be aware, the swell is over 5ft, so it might be a bit much for absolute beginners, but it's not quite into heavy territory.
The other decent-looking window is the Sunday, 16th August morning. That's a 5ft swell from the NW, also with glassy conditions and a short period of 8 seconds. The energy is moderate at 343. It's a solid option, but the Monday morning is the clear winner.
After that, things go back to being average. The wind picks up again, and the swell drops off. For the second week, the outlook is pretty flat overall. São João is a beach and jetty setup, and with the persistent cross-onshore winds most of the time, it's more of a kite-surfing setup than a paddle-surfing one when the wind is up.
So, to sum it up: hold on through the first week, and get ready for a couple of glassy mornings on the 16th and 17th. The 17th is the pick of the bunch.
Stay stoked,
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Thu 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 25°C on Fri morning, min 18°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
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 | NW 9 | NNW 9 | NNW 7 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | WNW 7 | NW 7 | W 7 | NNW 5 | NW 7 | NW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 129 | 118 | 90 | 88 | 225 | 301 | 312 | 303 | 316 | 378 | 283 | 149 | 97 | 78 | 41 | 83 | 91 | 36 | 37 | 131 | 94 |
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 | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross |
High Tide | 7:01PM2.53m | 7:30AM2.35m | 7:52PM2.37m | 8:28AM2.25m | 8:59PM2.23m | 9:42AM2.20m | 10:24PM2.16m | 11:07AM2.25m | 11:52PM2.22m | 12:24PM2.42m | 1:04AM2.38m | 1:27PM2.66m | 2:02AM2.56m | ||||||||
Low Tide | 12:44PM0.50m | 1:14AM0.49m | 1:33PM0.62m | 2:07AM0.63m | 2:36PM0.74m | 3:14AM0.75m | 4:00PM0.79m | 4:39AM0.79m | 5:31PM0.72m | 6:03AM0.71m | 6:49PM0.52m | 7:10AM0.53m | 7:50PM0.29m | ||||||||
 | |  | | | | | | | | | | | | | | | | | | | |
 | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — |
 | — | 8:45 | — | — | 8:44 | — | — | 8:43 | — | — | 8:40 | — | — | 8:39 | — | — | 8:38 | — | — | 8:37 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 21 | 24 | 24 | 19 | 26 | 25 | 20 | 25 | 25 | 20 | 25 | 25 | 21 | 25 | 24 | 20 | 25 | 25 | 20 |
Feels °C | 24 | 22 | 21 | 21 | 20 | 16 | 22 | 20 | 17 | 22 | 21 | 18 | 22 | 22 | 21 | 23 | 21 | 19 | 22 | 21 | 18 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | N 9 | WNW 8 | WNW 8 | W 10 | W 10 | W 10 | W 10 | W 9 | WNW 9 | WNW 9 | WNW 9 | NNW 7 | WNW 9 | W 8 | NW 11 | NW 10 | W 7 | W 7 | W 11 | NW 12 |
| kJ | 129 | 7 | 90 | 69 | 56 | 53 | 49 | 49 | 45 | 28 | 28 | 26 | 97 | 25 | 32 | 31 | 27 | 35 | 22 | 2 | 38 |
Swell 2 Height (m) Direction Period (s) | NNW 8 | NW 12 | NW 11 | NW 9 | SW 12 | WNW 7 | WNW 6 | S 12 | S 13 | S 12 | S 12 | S 12 | WNW 9 | S 11 | NW 12 | S 13 | S 11 | NNW 10 | NW 9 | NW 14 | WNW 10 |
| kJ | 6 | 5 | 56 | 88 | 6 | 17 | 8 | 3 | 3 | 3 | 3 | 3 | 26 | 3 | 6 | 3 | 2 | 36 | 19 | 8 | 10 |
Swell 3 Height (m) Direction Period (s) | SW 13 | N 8 | SW 12 | W 10 | — | SW 12 | SW 12 | — | — | — | — | — | W 6 | — | N 10 | S 11 | — | W 12 | W 11 | S 12 | NW 9 |
| kJ | 7 | 1 | 6 | 19 | — | 6 | 6 | — | — | — | — | — | 2 | — | 2 | 2 | — | 3 | 2 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | WNW 8 | — | — | NW 9 | NNW 9 | NNW 7 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 7 | — | NNW 7 | NNW 7 | WNW 7 | NW 7 | NNW 4 | NNW 5 | NW 7 | NW 6 |
| kJ | — | 118 | — | — | 225 | 301 | 312 | 303 | 316 | 378 | 283 | 149 | — | 78 | 41 | 83 | 91 | 17 | 37 | 131 | 94 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 183 | 5 | 11 | 525 | 298 | 198 | 578 | 92 | 171 | 971 | 171 | 74 | 584 | 6 | 74 | 1620 | 106 | 263 | 580 | 171 |
Best forecast wave conditions in Lisboa | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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Information about the Sao Joao Surf forecast
The above surf forecast table for Sao Joao provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sao Joao can be found by selecting the local surf guide option on the grey menu. Our Sao Joao 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 Joao) 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 Joao 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 Joao is 4 km (2 miles) from Paco de Arcos. If you plan a holiday in Lisboa, look for hotels and other accommodation in Paco de Arcos. Paco de Arcos has rooms for a wide range of budgets as well as car hire and transport links.
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