Onjuku Surf Forecast and Surf Report

Alright, let’s get into it. This is Rusty, and I’ve got the goods for Onjuku coming up over the next couple of weeks.

Right now, we’re in a bit of a flat spell, no real surf to speak of for the first few days, so don’t rush down. The water is sitting at 81°, which is a full degree warmer than usual for this time of year – feels like a bath out there, so a springy will do you fine.

Come Saturday morning, September 12, things start to show a pulse. East swell around 2ft with a clean 14-second period and a moderate offshore breeze from the north. The combined energy is still moderate at 202, but it’ll be clean and offshore, and after the previous drizzly rubbish, that’s a win. It’s not a standout, but it’s a good sign.

Sunday morning, September 13, is the first real highlight of this run. Onjuku gets 2ft from the ESE at 13 seconds, light offshore from the NNE. The energy is still moderate at 220, but the wind is gentle and offshore, so the waves will be clean and feel a bit more lined up. This is the first morning worth paddling out for – small but fun, quiet vibes.

Now, hold up for Wednesday afternoon, September 16. This is a sneaky one – glassy conditions, no wind at all (NNE at 3 mph), and 2ft from the east at 12 seconds. The energy is moderate at 241, but the glassy surface is rare these days. It’ll be small, but if you’re on a log, you’ll be grinning. Not a big day, but a sweet little session.

Then we jump ahead a week. Friday, September 18, the real swell kicks in. An east-northeast wind, offshore at 22 mph in the afternoon, with a 8ft groundswell from the SE at 16 seconds – that’s a very long period, so the waves will have serious push and shape. The combined energy is massive at 3684. This is serious. That size, 8ft, is pushing into expert territory, especially with that long period making it dumpy at the banks. Best for experienced surfers only.

Sunday, September 20, offers a cleaner window. Morning gives us 7ft from the south at 13 seconds, light ENE cross-off wind, and combined energy of 1944. The conditions are clean, and the swell is solid. This is one of the better-looking days for a competent crew.

The absolute standout of the entire outlook? Friday afternoon, September 25. Glassy conditions, a 10ft groundswell from the SE at 16 seconds – that’s very long period, proper deep-ocean energy – and the combined energy is a huge 4619. The wind is glassy from the WSW at just 3 mph. That’s a clean, powerful, heavy session for experts only. This is the one to circle on your calendar, but it’s far out, so keep checking back. The Saturday after that (September 26) pushes 12ft SE swell, but the wind swings cross-shore and the energy hits 5271 – it’s too big for the break, only for the nitro-burners.

In between, there are a few days with onshore wind and messy conditions, and from September 22 through 24, it’s mostly no-go, with some rain and fresh onshore breezes.

So, bottom line: if you want small clean fun, aim for the 13th or 16th. For power and size, the 18th and 20th are solid, and the 25th is the real long-range diamond – big, glassy, and heavy.

Stay patient, that run is coming.

Rusty.

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