Onjuku Surf Forecast and Surf Report

G'day, Rusty here, your local surf checkin' in from the Chiba coast. We've got a solid run of swell on the cards for Onjuku, but it's a mixed bag with the conditions, so let's break it down.

First up, the water is sitting at 81°, which is a tick warmer than the long-term average for this time of year, so you'll be comfortable in a spring suit or even just boardies.

The real story is the start of the week. Tuesday, the 4th of August, we're looking at a serious pulse of energy. A 12 ft swell from the SE, with a super long 16-second period, is pumping a massive 6,322 units of combined energy (6,322) into the beach. This is groundswell that's got some serious grunt. The wind is a cross-offshore from the NE, keeping things clean, but at 22 mph it's a fresh breeze. Now, this is the standout session, but only for the experienced crew. That 12 ft is well over the 8 ft mark, making it strictly for experts. The long period will see waves breaking too straight for a beach break like Onjuku, but if you know where to sit, you'll get some freight trains. It's inconsistent here, so don't expect a wave every minute, but the ones that come will be worth the wait. Crowds are possible, so get in early.

Wednesday, the 5th of August, keeps the size at 12 ft, but the period drops to 14 seconds and the wind stays a fresh cross-offshore. The energy is still massive (5,411 to 5,288). This is still a big day for experts only.

Thursday, the 6th of August, sees the swell back off to 8 ft, still with a 13-14 second period. The wind is lighter, a gentle breeze, and clean in the morning. The energy is still strong (2,749). This is a bit more manageable, but still a bigger wave for intermediate surfers. The afternoon gets a bit of a cross-shore bump, so morning is the pick.

Friday, the 7th of August, the swell drops to 7 ft and then 6 ft, but the wind swings onshore from the ESE, bringing rain showers. The cross-chop will make it messy. The energy is moderate (2,437 to 3,416). Not a great day for a paddle.

Saturday, the 8th of August, the swell is down to 5 ft. The wind is still cross-shore, and there's risk of a thunderstorm. The energy is moderate (1,492 to 1,665). This is a marginal day.

Sunday, the 9th, the swell bumps up a touch to 6 ft-6 ft from the ESE, with a 14-second period. The wind is a cross-offshore in the afternoon. The energy is moderate (2,066 to 2,408). Not a standout, but a possible session if you're keen.

Monday, the 10th, the wind picks up again to a fresh cross-offshore, but the swell drops to 4 ft before jumping to 7 ft. The energy is moderate (1,855 to 2,469). The morning looks small and clean.

Then we hit a bit of a lull in quality. From Tuesday, the 11th of August, we get another big pulse of 10 ft from the ENE with a 12-second period, cranking 4,647 units of energy. The wind is a fresh cross-offshore again, so it's clean, but this is a big, powerful swell. It's a Tuesday, so crowds might be a bit less, but it's still a spot for experts only. The afternoon swings to a 7 ft from the SW with a 14-second period, which is a different direction.

From Wednesday, the 12th of August, right through to the end of the outlook on the 19th, the conditions get a bit ragged. The winds turn onshore from the SSW and SE, bringing choppy, cross-onshore conditions. The swell stays between 5 ft and 8 ft, but the energy drops into the low to moderate range (680 to 2,291). There are a few moments with clean cross-offshore winds on the 14th and 15th of August, with 5 ft to 7 ft swell, but it's not the same quality as the start of the period. The 16th and 17th of August have onshore winds and the 18th and 19th are poor.

So, to sum it up, the absolute standouts are Tuesday the 4th and Wednesday the 5th of August for the big-wave chargers. The next best window is the morning of Thursday the 6th, and maybe the afternoon of the 9th. After that, it's a bit of a waiting game for the next proper clean window. The setup for the later days is more interesting for kite surfing than paddle surfing given the wind.

Stay stoked,
Rusty

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