Onjuku Surf Forecast and Surf Report

Alright, Rusty here, let’s get into it.

We’re looking at a solid stretch of surf coming up at Onjuku, though it’s not for the faint of heart. The first decent window hits Sunday morning, the 9th of August. We’ve got a solid 6ft of ESE groundswell (13 seconds) rolling in, and it’s glassy – that’s a beautiful start. The water temp is about average for this time of year, so no surprises there.

Sunday morning is a standout. That 6ft swell with glassy conditions is a real treat. The combined energy is pumping at 1131 (moderate to strong), so it’s got some punch. Keep in mind, this is an exposed spot, and at that size it's for experienced surfers only – over 5ft, so beginners should sit this one out. The crowd factor is “sometimes,” so it could get a bit busy.

By Monday the 10th, the swell bumps up to 7ft from the east, but the wind picks up to a cross-offshore breeze (15-18 mph). It’s still clean, but that wind is a bit of a hassle. The energy jumps to 1226 then later 2943 (strong to very strong) – a lot of power, but the quality takes a hit.

Tuesday morning the 11th looks like another highlight. The wind swings light WNW cross-offshore, the swell is 7ft from the east with an 11-second period, and conditions are clean. The energy is 1137 – moderate to strong – and the report calls it excellent for experienced surfers. This is the kind of morning you set the alarm for.

After Tuesday afternoon, things go a bit ragged. The wind gets messy, and we hit a gap of several quiet days mid-week. Wednesday and Thursday are small and choppy, not worth paddling out for. By Friday the 14th, we get a pulse of 7ft from the east, but the wind is cross or cross-off and the energy is up there (1537), though the quality is marginal. Not a standout, but a possible early session if you’re keen.

The weekend of the 15th-16th stays in the 6ft to 7ft range from the east, but the wind is strong (15-22 mph). Clean, but those stiff winds make it a workout. For a beach break like this, the setup is starting to look more interesting for kite surfing than paddle surfing.

The next real standout comes on Wednesday the 19th of August. Swell holds at 7ft from the east, period drops to 8 seconds, but the wind is light cross-off in the morning and glassy-adjacent in the afternoon. The energy is 1107 (moderate to strong) and the report says excellent for experienced surfers. This is another top pick – just watch the shorter period, which can make the waves a bit dumpy at a beach break. Perfect for reefs or points, but here it’s still good if you’re ready for a steeper drop.

After that, the last week of the forecast trails off. The 20th through 24th sees smaller swell (2ft to 7ft) with onshore or cross-onshore winds and dropping energy. There’s a small, glassy morning on the 22nd with 4ft of ESE swell – a gentle session for a longboard, but nothing to write home about.

Best on offer: Sunday morning the 9th for that glassy groundswell, and Wednesday the 19th for cleaner conditions on a solid size. Both are for experienced surfers only.

Rusty.

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