Surf Forecasts:
Balneario Sao Jose surf forecast from 9 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 9PM (local time) - 4.5ft (1.4m), 12s period, SSE swell with glassy winds.
- Most powerful swell: Monday 10 Aug, 6PM (local time) - 6ft (1.9m), 13s period, SSE swell with 1,230 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 9PM (local time) - 4.5ft (1.4m), 12s period with SSE swell.
Best Forecast Surf Conditions for Balneario Sao Jose this week:
The surf forecast for Balneario Sao Jose over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 12) at 9PM. The primary swell is predicted to be 1.4m and 12s period with a secondary swell of 0.9m and 5s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Balneario Sao Jose in the next 16 days are 1.9m 13s and forecast to arrive on Monday (Aug 10) at 6PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 12th Aug) | 4.5ft (1.4m) 12s |
| Best Surf | 9PM (Wed 12th Aug) | 4.5ft (1.4m) 12s |
| Most Powerful | 6PM (Mon 10th Aug) | 6ft (1.9m) 13s |
Table - best surf conditions forecast for Balneario Sao Jose over the next 16 days.
The Lowdown
Alright, Rusty again. Let’s break it down in feet and degrees for you.
We’ve got Balneario Sao Jose, a beach/pier spot that eats south swell. Water’s running about 69°F, which is a touch warmer than average for the time of year – nothing wild, but a nice little comfort.
Sunday is a mess. That 4ft south swell (13-second period) is there, but the cross-on wind chops it up. Wave energy is moderate (605). Monday through Wednesday is more of the same nonsense. Swell gets as big as 6ft – 6ft from the SSE with a 13-second period, and the wave energy climbs into strong territory (752 to 1133), but the wind is either onshore or cross-onshore. Lumpy and no fun.
Thursday the 13th morning changes the tune. Glassy, calm, and a clean 4ft SSE swell, 12-second period, with moderate energy (480). That’s a real surf session. Friday the 14th morning is the real gem here – dead calm, glassy, 4ft south swell at 13 seconds (585). Perfect for a long morning with your favorite board.
Saturday drops back to cross-ons, but Sunday the 16th morning surprises with a glassy 3ft SSE swell. Small but clean.
Now the big one. Monday the 17th. You’re looking at a 8ft ESE swell, 8-second period, with strong wave energy (1152). And it’s glassy. That’s a heavy, punchy wall of water – experts only. The short period means it’ll be a bit dumpy, but on a beach break, that can wedge up nicely. The afternoon holds at 6ft and still glassy (650). This is the best session of the whole 16 days.
Tuesday and Wednesday the 18th–19th go flat. Swell drops to 3ft – 5ft, cross-onshore wind comes back, wave energy tanks (166 – 440). Not worth paddling out.
Then, Friday the 21st is the late-period standout. A 8ft south swell, 9-second period, with a clean cross-offshore breeze. Wave energy is strong (1462). That’s a serious amount of power for the confident surfer. Crowds are likely here when it’s good.
From the 23rd onward it’s small, windy, and miserable.
So: don’t bother until Thursday. Your best bets are Friday the 14th morning for a clean, glassy session, and Monday the 17th for the biggest, cleanest power. The 21st is a promising long-range call for the brave, but it’s a week and a half out, so stay tuned.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Mon afternoon. Warm (max 21°C on Sun morning, min 17°C on Mon afternoon). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Thu morning, min 18°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | S 13 | S 13 | S 11 | S 12 | SSE 13 | S 13 | SSE 13 | SSE 13 | SSE 12 | S 12 | SSE 12 | SSE 12 | SSE 12 | SSE 15 | SSE 14 | S 13 | SSE 13 | SSE 14 | SSE 13 | SSE 12 | SSE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 590 | 392 | 629 | 699 | 1144 | 956 | 995 | 1121 | 730 | 683 | 589 | 503 | 439 | 817 | 754 | 573 | 608 | 874 | 812 | 692 | 224 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-off | glassy | on | off | glassy | on | cross | cross-on | cross-on | glassy |
High Tide | 1:40PM1.19m | 00:53AM0.94m | 2:08PM1.28m | 1:28AM1.07m | 2:35PM1.32m | 2:01AM1.20m | 3:01PM1.32m | 2:33AM1.30m | 3:26PM1.29m | 3:06AM1.36m | 3:50PM1.25m | 3:38AM1.38m | 4:14PM1.21m | ||||||||
Low Tide | 7:52PM0.42m | 7:38AM0.09m | 8:27PM0.40m | 8:18AM-0.01m | 8:56PM0.40m | 8:53AM-0.05m | 9:19PM0.40m | 9:24AM-0.05m | 9:35PM0.40m | 9:50AM0.01m | 9:45PM0.38m | 10:10AM0.09m | 9:53PM0.35m | ||||||||
 |  |  | | | | | | |  | |  |  | |  | | | | | | | |
 | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — | 6:33 | — | — |
 | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:49 | — |
mm | — | 1 | 3 | 2 | 5 | 4 | 2 | 2 | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 19 | 18 | 19 | 17 | 17 | 18 | 18 | 19 | 21 | 21 | 19 | 24 | 23 | 20 | 22 | 23 | 20 | 21 | 20 | 20 |
Feels °C | 22 | 20 | 19 | 20 | 15 | 16 | 18 | 18 | 20 | 22 | 23 | 21 | 25 | 24 | 22 | 23 | 25 | 23 | 23 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 11 | S 12 | E 8 | S 13 | SSE 13 | SSE 13 | SSE 12 | S 12 | SSE 12 | SSE 12 | SSE 12 | SSE 15 | SSE 14 | S 13 | SSE 13 | SSE 14 | SSE 13 | SSE 12 | SE 8 |
| kJ | 590 | 392 | 629 | 699 | 5 | 956 | 995 | 1121 | 730 | 683 | 589 | 503 | 439 | 817 | 754 | 573 | 608 | 874 | 812 | 692 | 206 |
Swell 2 Height (m) Direction Period (s) | E 6 | S 6 | SSE 16 | E 8 | E 8 | E 12 | E 7 | — | — | — | — | — | E 6 | E 6 | E 6 | E 6 | E 6 | E 8 | E 9 | E 8 | SSE 12 |
| kJ | 15 | 52 | 51 | 10 | 19 | 3 | 4 | — | — | — | — | — | 41 | 33 | 16 | 12 | 7 | 12 | 13 | 6 | 224 |
Swell 3 Height (m) Direction Period (s) | — | E 6 | E 7 | E 8 | — | E 12 | — | — | — | — | — | — | — | E 6 | — | — | E 8 | — | — | E 9 | — |
| kJ | — | 10 | 9 | 43 | — | 3 | — | — | — | — | — | — | — | 33 | — | — | 1 | — | — | 14 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSE 13 | ESE 5 | E 6 | E 5 | E 4 | E 5 | E 5 | E 5 | — | — | — | — | — | ENE 6 | — | — | — |
| kJ | — | — | — | — | 1144 | 21 | 22 | 12 | 19 | 21 | 35 | 43 | — | — | — | — | — | 8 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 175 | 32 | 32 | 95 | 95 | 28 | 28 | 59 | 17 | 19 | 0 | 0 | 44 | 0 | 0 | 66 | 23 | 35 | 35 | 0 |
Best forecast wave conditions in São Paulo | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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Information about the Balneario Sao Jose Surf forecast
The above surf forecast table for Balneario Sao Jose provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Balneario Sao Jose can be found by selecting the local surf guide option on the grey menu. Our Balneario Sao Jose 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 (Balneario Sao Jose) 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 Balneario Sao Jose 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.
Balneario Sao Jose is 3 km (2 miles) from the city of Mongagua. If you plan a holiday in São Paulo, look for hotels and other accommodation in Mongagua. Mongagua has rooms for a wide range of budgets as well as car hire and transport links.
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