Balneario Sao Jose Surf Forecast and Surf Report

G’day, Rusty here. We’ve got a solid run of surf ahead at Balneario Sao Jose, but you’ll need to pick your windows. The first few days are the pick, then things get messy mid-period before a nice clean-up early in the second week.

Kicking off Wednesday morning, the 2nd of September, it’s glassy with a clean 5ft southerly swell, period around 9 seconds, and moderate energy (408). This is a ripper start – clean, no wind, and the water temp is about average for this time of year, so no surprises there. It’s a beach/pier setup, exposed to the swell, and crowds are often around, but with conditions this good, it’s worth it.

Thursday morning the 3rd, the swell drops a touch to 5ft from the SSE, but the period bumps up to 11 seconds – a proper groundswell now – with energy climbing to 540. Light offshore wind from the NE, waves are clean and well-shaped. This is a standout morning. That longer period means better shape and longer lulls between sets, making it easier to paddle out. It’s a good day for intermediates – not too big, but plenty of push.

Friday morning the 4th, it’s smaller – 3ft from the SSE – with glassy conditions and 283 energy. A fun little session for a smaller board, very clean.

From Friday afternoon through the weekend, things go south. Onshore winds and rain showers kick in. Swell drops to 2ft to 2ft and becomes weak and messy with short period (8 seconds). Energy falls to triple digits (136) or below. Not worth paddling for.

Monday the 7th and Tuesday the 8th see the swell rebuild a bit – 5ft to 5ft from the S and SSE – but onshore winds and rain ruin the quality. Periods around 8-12 seconds, energy moderate (298-688), but it’s choppy and ugly.

Wednesday the 9th afternoon brings a change: 6ft from the east, cross-offshore wind from the NE, and 450 energy. The period is short at 7 seconds, so it’s a windswell, but the clean conditions make it rideable. Not a standout, but a break from the dross.

Now, here’s the real standout: Thursday morning the 10th of September. You get 6ft from the ESE, long period of 9 seconds, and strong energy of 720. Light cross-offshore wind from the NE, waves are clean. This is the best of the run – proper groundswell, good size, and excellent shape. Get out early.

Friday the 11th morning is also good – 5ft from the ESE, period 10 seconds, 485 energy, and clean with cross-offshore wind. A solid follow-up.

After that, it fades again. Saturday the 12th and Sunday the 13th drop back to 3ft, with messy wind and rain on Sunday. Monday the 14th sees the swell jump to 6ft from the SE, but strong cross-shore wind and rain make it a chop-fest – more interesting for kite surfing than paddle.

Then, a late gem: Tuesday the 15th of September morning, glassy conditions with 6ft from the SE, 9-second period, and 526 energy. Tuesday afternoon is even better – 6ft, glassy calm (0 wind), 643 energy, very clean. Wednesday the 16th morning stays glassy with 6ft from the SE, 10-second period, and 689 energy – a big, clean groundswell morning, but note the heavy rain rolling in by afternoon. The 16th is also a Tuesday more than a week out, so keep an eye on the forecasts – it’s promising but not locked in.

Through the second week, the standout remains the clean glassy mornings around the 10th and the 15th-16th. The rest is average to poor.

Overall, the first week has the most reliable windows, with Thursday the 3rd morning and Thursday the 10th morning being the true standouts. After that, the second week’s best bet is Tuesday the 15th and Wednesday the 16th mornings – but only if you’re willing to gamble on the long-range call.

Rusty.

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