Onjuku Surf Forecast and Surf Report

Alright, Rusty here with the imperial rundown.

Right now we’re in a flat spell at Onjuku. Small surf and just ordinary conditions. We start on Sunday the 23rd of August with tiny 2ft easterly swell, period around 9 seconds, so it’s weak and mushy. Wind is a light cross-offshore from the NE, surface is clean, but there’s barely any energy (combined energy of all swells directed here is 102). It’s surfable but very ordinary. Water temp is 81°, about average for this time of year.

Sunday afternoon stays small at 2ft from the SSE, period jumps to 12 seconds, wind goes cross-shore, energy picks up to 241. Still marginal.

Monday the 24th sees a bump. Morning has 3ft from the SSE with a very long period of 18 seconds – proper groundswell – energy at 941. Wind is light southerly and onshore, so it’s clean but questionable on the tide. Afternoon gets bigger at 6ft, same SSE direction, period 16 seconds, energy 1827, but wind swings cross-onshore from the SSW at 12 mph, making it choppy.

From Tuesday the 25th through Thursday the 27th, conditions get worse. Swell hangs around 2ft to 6ft but winds are cross-onshore and fresh, blowing the surface out. Thursday even has a risk of thunderstorms. Rough patch.

Friday the 28th is small and marginal with light rain and cross-onshore wind.

Saturday the 29th and Sunday the 30th clean up a bit. Swell stays tiny, 2ft to 3ft, but wind goes cross-offshore from the ENE, so the surface is glassy. Energy is low (148 to 259), so it’s more about a gentle paddle.

Now the good stuff. Monday the 31st of August morning and afternoon both look good. Swell is small at 2ft from the east, period 11 seconds, but the wind goes offshore from the north at just 6 mph – glassy conditions. Energy is moderate (227) and the reports say to expect good surf. Clean and inviting.

The standout is Tuesday the 1st of September. Morning has 4ft southerly swell with a 14-second period, energy at 838. By the afternoon, it’s 5ft from the south, period 13 seconds, energy 881, and the wind is offshore from the NNE at 12 mph – that’s clean, lined-up waves. This is the best of the whole outlook. The swell direction from the south matches the optimum SSE well.

Wednesday the 2nd of September sees a bump – 6ft to 6ft from the ESE, period 10 seconds, energy hits 1801 in the afternoon. Wind is cross-offshore from the NE, so it’s clean, but shorter period makes it more of a beach-blast.

From Thursday the 3rd onward, conditions become uncertain. Winds pick up, and by the 4th and 5th of September we’re looking at strong onshore winds and building chop, with swell up to 8ft from the SE – expert-only and blown out. The final days, 6th and 7th of September, are a write-off.

Best bet: Monday the 31st for small, clean fun, and absolutely Tuesday the 1st of September for the standout session. Don’t miss that Tuesday afternoon.

Rusty.

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