
Surf Forecasts:
Onjuku surf forecast from 3 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 3AM (local time) - 8ft (2.5m), 17s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 8 Jul, 6AM (local time) - 8ft (2.5m), 17s period, SE swell with 4,293 kJ wave energy.
- Next surfable swell (1★+): Tuesday 7 Jul, 12AM (local time) - 6ft (1.9m), 8s period with SE swell.
Best Forecast Surf Conditions for Onjuku this week:
The surf forecast for Onjuku over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Jul 07) at 12AM. The primary swell is predicted to be 1.9m and 8s period with a secondary swell of 0.3m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 2.5m 17s and forecast to arrive on Wednesday (Jul 08) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 7s period and expected on Tuesday (Jul 07) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 7th Jul) | 6ft (1.9m) 8s |
| Best Surf | 3AM (Wed 8th Jul) | 8ft (2.5m) 17s |
| Most Powerful | 6AM (Wed 8th Jul) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here. Let's have a look at what Onjuku has cookin' for us over the next couple of weeks.
Right off the bat, we're looking at a pretty flat and sloppy start. The first few days from Saturday through to Monday morning are just not worth paddling out for. We're talkin' small, weak, and choppy. The combined swell energy is barely registering, with values as low as 93 (weak energy) and the wind is just makin' a mess of things. That's a rough way to start the weekend.
Then Monday afternoon we start to see a bit of a pulse. The swell bumps up to 5ft from the ESE and the wind swings cross-offshore, cleanin' things up just enough to be considered marginal. It's not gonna be a classic, but if you're itchin' for a paddle, it's the first hint of something rideable.
The real story, and the standout of this whole forecast, is Wednesday the 8th through Friday the 10th. Wednesday morning, we've got a solid 8ft groundswell from the SE, with a very long period of 16 seconds, and the combined swell energy is a massive 4535 (strong to very strong energy). The wind is light and cross-offshore, makin' for clean conditions. This is proper, powerful surf. But listen, at this size and with that long period, Onjuku is a beach break, so those long lines are gonna be dumpy and close out quick. This is purely for the experienced crew. Beginners, stay on the sand for this one. Thursday morning is also a beaut – 7ft from the SSE, 14 second period and glassy, clean conditions thanks to a slight offshore breeze. The energy is still well up there at 2654. Friday morning is the real gem though: 8ft from the S, a 16 second period, and glassy as a mirror. The swell energy is at 3233. That is the morning to be out there. The conditions will be as clean as they come with that power. There's a chance the crowd factor might play up since it gets `sometimes` busy, but with quality this good, you'd expect a few others to have the same idea.
After that peak, things slowly wind down. Saturday the 11th and Sunday the 12th still have some size, with 7ft and 5ft respectively, but the wind is more onshore and the quality drops off. There's still some decent grunt in the water, but the onshore breeze will mess with the surface. The 12th of July has a clean morning with a 5ft swell from SSW, but the energy is much lower at 1131 (moderate) by then.
From Monday the 14th onwards, it's a long, drawn-out affair of poor quality and fading swell. The combined energy drops into the double and low triple digits, and the waves are small and weak. It looks pretty bleak from the 14th through the 19th, with a short-lived bump of dirty, wind-affected 7ft on the 18th. The 19th shows a tiny bit of life with a 4ft SSW swell and clean wind, but it's a low-energy affair (247). It's a real desert after that mid-week swell window.
So, to wrap it up: this first week is a write-off. The absolute stand-out session is Friday the 10th of July, first light. That morning with the glassy conditions and powerful S swell is about as good as it gets at Onjuku. The Wednesday and Thursday before it are also excellent for experienced surfers, just be aware of the long period close-outs at a beach break. After that, the tank is empty for over a week. Keep your eyes on the charts, because forecasts can change, and it doesn't often stay this flat for long.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Sun night. Warm (max 23°C on Sat morning, min 21°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Thu afternoon, min 20°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Fri 10 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | ENE 7 | E 7 | E 8 | E 8 | SE 5 | SE 5 | SE 6 | ESE 7 | ESE 7 | SE 8 | SSE 15 | SSE 16 | SE 17 | SE 16 | SE 16 | SE 14 | SSE 14 | SSE 16 | S 15 | S 16 | S 16 |
Wave Graph | |||||||||||||||||||||
56 | 52 | 55 | 41 | 35 | 58 | 114 | 218 | 257 | 522 | 624 | 1150 | 3859 | 3855 | 3219 | 1615 | 1614 | 2746 | 2342 | 3080 | 2928 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | cross-off | cross-on | glassy | glassy | on |
High Tide | 6:00AM1.34m | 7:58PM1.31m | 6:44AM1.27m | 8:26PM1.32m | 7:35AM1.19m | 8:56PM1.32m | 8:39AM1.09m | 9:27PM1.32m | 10:09AM1.02m | 10:03PM1.33m | 12:13PM1.01m | 10:46PM1.33m | 2:21PM1.09m | ||||||||
Low Tide | 00:39AM0.87m | 1:02PM0.23m | 1:24AM0.82m | 1:33PM0.32m | 2:14AM0.77m | 2:06PM0.43m | 3:11AM0.70m | 2:42PM0.57m | 4:16AM0.61m | 3:24PM0.73m | 5:27AM0.49m | 4:20PM0.89m | 6:39AM0.36m | 5:47PM1.02m | |||||||
— | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:30 | — | — | 4:30 | — | — | 4:31 | — | — | 4:31 | — | |
6:55 | — | 6:55 | — | — | 6:55 | — | — | 6:55 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | |
mm | — | 3 | 1 | 7 | 3 | 1 | 7 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 23 | 22 | 23 | 23 | 21 | 23 | 23 | 22 | 23 | 23 | 21 | 23 | 23 | 21 | 24 | 25 | 23 | 25 | 25 |
Feels °C | 24 | 24 | 23 | 24 | 24 | 22 | 20 | 22 | 22 | 22 | 21 | 22 | 20 | 23 | 23 | 22 | 25 | 27 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | E 7 | E 8 | E 8 | E 7 | SE 10 | SE 6 | SE 13 | SE 12 | SE 8 | ESE 8 | ESE 9 | SE 17 | SE 16 | SE 16 | SE 14 | SSE 14 | SSE 16 | S 15 | S 16 | S 16 |
56 | 52 | 55 | 41 | 28 | 35 | 114 | 140 | 152 | 522 | 477 | 464 | 3859 | 3855 | 3219 | 1615 | 1614 | 2746 | 2342 | 3080 | 2928 | |
Swell 2 Height (m) Direction Period (s) | SSE 6 | S 5 | NE 10 | S 4 | SE 10 | ENE 8 | ENE 8 | NE 8 | ENE 8 | NE 8 | SSE 15 | SSE 16 | ESE 9 | S 22 | S 20 | SSE 16 | S 18 | ESE 8 | ESE 9 | ESE 8 | ESE 8 |
11 | 5 | 26 | 9 | 25 | 19 | 20 | 11 | 11 | 9 | 624 | 1150 | 484 | 342 | 791 | 1569 | 891 | 119 | 137 | 153 | 105 | |
Swell 3 Height (m) Direction Period (s) | NE 11 | NE 10 | SE 11 | SE 10 | ENE 9 | NE 9 | SE 9 | SSW 7 | SW 7 | SW 7 | — | SSE 22 | SSE 18 | S 22 | S 19 | ESE 8 | ESE 8 | — | ESE 9 | — | — |
29 | 27 | 19 | 16 | 8 | 3 | 22 | 5 | 2 | 2 | — | 265 | 1392 | 338 | 1216 | 235 | 149 | — | 162 | — | — | |
Wind waves Height (m) Direction Period (s) | — | SSE 5 | SSE 3 | — | SE 5 | SE 5 | — | ESE 7 | ESE 7 | — | NNE 7 | — | — | — | E 8 | — | — | — | — | — | — |
— | 9 | 4 | — | 35 | 58 | — | 218 | 257 | — | 5 | — | — | — | 309 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 9 | 587 | 9 | 557 | 598 | 74 | 68 | 68 | 0 | 51 | 51 | 51 | 0 | 51 | 0 | 0 | 9 | 0 | 0 | 9 |
Best forecast wave conditions in Chiba | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Onjuku Surf forecast
The above surf forecast table for Onjuku provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Onjuku can be found by selecting the local surf guide option on the grey menu. Our Onjuku surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Onjuku) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Onjuku may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Onjuku is 3 km (2 miles) from Ohara. If you plan a holiday in Chiba, look for hotels and other accommodation in Ohara. Ohara has rooms for a wide range of budgets as well as car hire and transport links.











