Balneario Sao Jose Surf Forecast and Surf Report

Alright surfers, Rusty here with a fresh look at the next couple of weeks down at Balneario Sao Jose. We’ve got a bit of a mixed bag coming, but there are some proper windows to keep an eye on.

The first few days are pretty mellow. We kick off this Tuesday afternoon (15th Sept) with some clean, glassy 3ft swell rolling in from the south. The water’s sitting at 71°, which is a touch warmer than normal for this time of year—nice little bonus. The combined energy is moderate at 212, so it won’t be firing, but for a small wave funboard or a log, those glassy conditions will be a treat, and it’s the best of the early window. Wednesday morning (16th) drops right off to 2ft, so not much to get excited about there, and by Wednesday afternoon the wind swings onshore and ruins the party.

We’ve got a bit of a lull from Thursday through Friday with poor conditions and messy onshore winds, though Saturday morning (19th) sneaks back in with a glassy 5ft wave. The energy is still moderate at 325, and while the period is short at 7 seconds, the clean surface will make it rideable. Sunday morning (20th) is similar—glassy conditions with 5ft of ESE swell (290 combined energy). These are small-craft days, not standouts, but solid for a grovel session.

Now, the end of the forecast gets interesting. Sunday the 27th of September is your standout window. We’re looking at a proper pulse of 6ft swell from the south early that morning with glassy conditions and combined energy pushing into the strong range at 511. That’s a solid step up in power. For the more experienced crew, that’s the call. The period is only 8 seconds, so it’s a windswell, but with zero wind and a clean face, it’ll offer some punchy lines. The afternoon turns a bit onshore and might get marginal, so hit the early session. Monday the 28th continues the run with a glassy 5ft south swell, energy still strong at 537, and absolutely dead calm wind. Again, the morning is where it’s at. The afternoon picks up a longer period (13 seconds) and more energy (903), but the cross-onshore breeze will chop it up a bit.

Beyond that, conditions look less reliable with onshore flows and storm risks creeping in. The last day of the month, Wednesday the 30th of September, shows a glassy 3ft south swell (445 energy) in the morning, but nothing that compares to that late September pulse.

So, to wrap it up: the first standout is Saturday morning (19th) for the clean, small waves. But the real highlight—the one to circle on the calendar—is Sunday the 27th of September's early session for the best combo of size, energy, and glass.

This is Rusty, signing off. Stay wet.

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