Surf Forecasts:
Balneario Sao Jose surf forecast from 11 Sep 2026:
- Best quality surf: Monday 14 Sep, 12PM (local time) - 7ft (2.1m), 8s period, SE swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 6PM (local time) - 5ft (1.5m), 14s period, S swell with 931 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 6AM (local time) - 2.5ft (0.8m), 14s period with S 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 Friday (Sep 11) at 6AM. The primary swell is predicted to be 0.8m and 14s period with a secondary swell of 0.7m and 8s. 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 1.5m 14s and forecast to arrive on Thursday (Sep 17) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 11th Sep) | 2.5ft (0.8m) 14s |
| Best Surf | 12PM (Mon 14th Sep) | 7ft (2.1m) 8s |
| Most Powerful | 6PM (Thu 17th Sep) | 5ft (1.5m) 14s |
Table - best surf conditions forecast for Balneario Sao Jose over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about the next couple of weeks at Balneario Sao Jose. This beach/pier setup is exposed to the south-east, so it's all about what the ocean is pushing in from that direction.
The week starts slow. Friday the 11th is your best early bet, with a clean, glassy 2.6ft of S swell gliding in. The water's about average for this time of year. We’re talking small, clean lines in the morning with light east winds, really just a gentle breeze. The combined energy is moderate, so there's enough push for a fun session on a longboard or a fish. Afternoon gets a bit lumpy with a crossshore breeze so watch the tide.
Then we hit a dry patch. Saturday the 12th through Sunday the 14th is basically a write-off. We get rain, cross-onshore winds, and messy conditions. The swell jumps up to 6.6ft on Sunday morning, but it's all over the place with a short period, so not worth paddling out for.
Monday the 15th is a mixed bag. Morning brings a clean 4.3ft from the ESE with a light offshore cross-off wind. This would be the pick of the early week, clean waves with that westerly breeze keeping the face nice. The energy is moderate. The afternoon gets blown out by a 16 mph crosshore.
We go into a bit of a rocky patch for the middle of the week. Tuesday the 16th has some size (4.9ft) but it's onshore and messy. The 17th is the same story, bigger swell but with choppy cross-onshore winds from the east, making it feel more like a kite-surfing day than a paddling one.
Now, here's the highlight. Get your board ready for Friday the 18th of September. This is the standout. Early morning we have a clean 3.6ft S swell rolling in with a light offshore cross-off breeze, energy is strong. The conditions will be clean and well-shaped, with a long 12-second period giving it some real push and nice, lined-up waves. The afternoon goes glassy with a 3.0ft S swell, which is just a beautiful way to spend the rest of the day.
Saturday the 19th keeps the glassy theme in the morning with another 4.6ft from the ESE, backed by a calm zephyr. That'll be clean but the period drops to 8 seconds, so it'll be a bit more walled up and might not hold as well. Still a good one.
Sunday the 20th and Monday the 21st offer more glassy conditions and manageable 4.9ft and 3.6ft ESE swells, but the quality is a step down from Friday. The 22nd of September brings a nice little run of clean, waist-to-shoulder high S swells on Tuesday with glassy wind in the afternoon.
The last few days of the outlook get smaller again. Wednesday the 23rd morning looks clean, but the swell drops through the second week. The 24th has tiny, ordinary surf from multiple directions, and the energy is weak. The final Saturday the 26th brings a bigger, sloppier 6.2ft ESE swell but with poor onshore winds. Not the best way to end.
So, for the whole run, lock in Friday the 18th and Saturday the 19th. That's the clear window of quality, clean surf.
Short Range ForecastHeavy rain (total 56mm), heaviest during Sat night. Warm (max 27°C on Fri afternoon, min 17°C on Sun afternoon). Winds increasing (calm on Thu night, fresh winds from the SW by Fri night). | Days 5-7 Weather SummaryHeavy rain (total 39mm), heaviest during Mon night. Warm (max 22°C on Tue morning, min 18°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 15 | S 13 | S 12 | S 12 | S 11 | S 5 | S 8 | SSE 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | SSE 8 | SSE 8 | S 12 | S 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 161 | 225 | 148 | 68 | 37 | 83 | 372 | 623 | 449 | 206 | 406 | 408 | 315 | 212 | 147 | 202 | 294 | 137 | 295 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross | cross-on | cross | cross-on | on | cross-on | cross-on | cross-on | cross | cross | off | cross-off | cross | glassy | cross-on | on | cross-on |
High Tide | 2:13AM1.38m | 2:51PM1.30m | 2:44AM1.43m | 3:12PM1.27m | 3:15AM1.42m | 3:34PM1.24m | 3:47AM1.36m | 3:55PM1.19m | 4:18AM1.27m | 4:17PM1.13m | 4:51AM1.16m | 4:39PM1.06m | |||||||
Low Tide | 8:54AM-0.01m | 8:54PM0.27m | 9:15AM0.05m | 9:07PM0.23m | 9:32AM0.14m | 9:21PM0.19m | 9:46AM0.24m | 9:38PM0.18m | 9:59AM0.35m | 9:59PM0.20m | 10:11AM0.46m | 10:21PM0.26m | |||||||
 |  |  |  |  |  |  |  | | | | | | |  |  | | |  | |
 | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | 6:01 | — | — |
 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — |
mm | 1 | 1 | — | 7 | 3 | 4 | 23 | 9 | 8 | 14 | 3 | 5 | 15 | — | — | — | — | 2 | 5 |
Temp °C | 22 | 26 | 27 | 26 | 24 | 19 | 18 | 18 | 18 | 19 | 21 | 20 | 19 | 22 | 22 | 19 | 21 | 19 | 18 |
Feels °C | 24 | 28 | 29 | 28 | 27 | 20 | 18 | 18 | 19 | 19 | 23 | 22 | 21 | 21 | 20 | 21 | 20 | 18 | 17 |
Swell 1 Height (m) Direction Period (s) | E 7 | S 13 | S 12 | E 5 | ESE 5 | E 8 | S 8 | SSE 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | SSE 8 | SE 8 | SE 8 | S 8 |
| kJ | 40 | 225 | 148 | 22 | 15 | 29 | 208 | 374 | 449 | 206 | 406 | 408 | 315 | 212 | 147 | 202 | 154 | 99 | 295 |
Swell 2 Height (m) Direction Period (s) | S 12 | E 8 | SE 13 | S 12 | S 11 | S 11 | E 8 | ESE 8 | — | S 14 | SSE 13 | S 12 | S 11 | S 11 | S 10 | ESE 8 | S 12 | S 12 | ESE 12 |
| kJ | 103 | 57 | 7 | 68 | 37 | 36 | 33 | 20 | — | 16 | 33 | 73 | 116 | 82 | 71 | 75 | 146 | 137 | 14 |
Swell 3 Height (m) Direction Period (s) | S 15 | SE 13 | — | E 8 | E 8 | SE 11 | — | — | — | — | — | S 10 | S 11 | — | — | S 10 | E 8 | E 8 | ESE 12 |
| kJ | 161 | 7 | — | 10 | 19 | 5 | — | — | — | — | — | 8 | 149 | — | — | 52 | 43 | 37 | 15 |
Wind waves Height (m) Direction Period (s) | — | — | E 8 | — | SSW 3 | S 5 | S 8 | SSE 9 | — | ESE 6 | — | E 8 | WSW 3 | SW 5 | SSW 5 | — | SSE 8 | S 6 | ESE 8 |
| kJ | — | — | 71 | — | 2 | 83 | 372 | 623 | — | 130 | — | 341 | 1 | 27 | 69 | — | 294 | 84 | 66 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 28 | 51 | 35 | 175 | 22 | 95 | 95 | 28 | 19 | 19 | 0 | 0 | 48 | 0 | 35 | 95 | 95 |
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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