
Surf Forecasts:
Onjuku surf forecast from 10 Jul 2026:
- Best quality surf: Monday 13 Jul, 12PM (local time) - 3.5ft (1.0m), 12s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 11 Jul, 3AM (local time) - 7ft (2.2m), 17s period, S swell with 2,733 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 12PM (local time) - 3.5ft (1.0m), 12s period with SSW 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 Monday (Jul 13) at 12PM. The primary swell is predicted to be 1.0m and 12s period with a secondary swell of 0.4m and 9s. 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 2.2m 17s and forecast to arrive on Saturday (Jul 11) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Mon 13th Jul) | 3.5ft (1.0m) 12s |
| Best Surf | 12PM (Mon 13th Jul) | 3.5ft (1.0m) 12s |
| Most Powerful | 3AM (Sat 11th Jul) | 7ft (2.2m) 17s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
G’day, it’s Rusty here. Fair warning – this 16-day stretch for Onjuku is a tough one, with only a couple of brief windows that might be worth paddling out for. The first week is mostly a write-off, with messy, onshore wind and poor quality surf. There’s a big gap from the start all the way through to late in the second week before we see anything half-decent, so patience is the name of the game.
Alright, let’s get into it. The first real flicker of hope doesn’t come until Monday the 13th of July. Even then, it’s not a classic. The swell drops right off to 3ft from the SSW, with a 13-second period (moderate groundswell energy). The combined energy is weak at 332, and while the morning is tangled with a risk of thunderstorms and a light cross-shore wind, the afternoon cleans up nicely with a cross-offshore breeze from the ENE. You’ll find small, clean waves, but it’s marginal – more of a longboard or foiling session.
The real standout, and the only one I’d get excited about, is on Thursday the 23rd of July. This is the pick of the bunch. The morning brings a clean 5ft swell from the ESE, with a 11-second period and a combined energy of 786 (moderate). The wind is a near-glass-off from the east at 3 mph, making for that very good surf conditions call. The swell direction is a touch east of the optimum SSE, but it’s still workable. The water is sitting at 74°, which is a bit colder than normal for this time of year – about 2° down, so you’ll want a decent spring suit.
The afternoon on the 23rd gets a bit tricky though. The swell jumps to 7ft from the E, with a very long 11-second period and a massive combined energy of 2262 (strong). That’s a heap of juice, but with a light cross-shore wind and a “marginal” call, it’s likely to be lumpy and hard to manage. This is more for experienced surfers only – the 7ft size and the long period can make for a close-out at beach breaks. Onjuku is an exposed beach-and-reef setup, so the long period might make it break too straight, especially if the tide isn’t cooperating.
Outside of these two sessions, the rest of the 16 days is a desert. After the 23rd, the 24th and 25th have clean winds but the swell drops back to 3-4ft, and the energy is weak to moderate. The ratings are poor to marginal, so it’s not worth chasing hard. The big gap between the 13th and the 23rd is about 10 days of mostly poor conditions, which is a long wait for not much reward.
Bottom line: if you’re keen, aim for the morning of Thursday the 23rd of July. That’s your best bet. The rest of the period is a lesson in patience.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Sun night. Warm (max 26°C on Sun morning, min 23°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Mon morning. Warm (max 27°C on Mon morning, min 24°C on Mon afternoon). Wind will be generally light. | ||||||||||||||||||||
Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | S 15 | S 16 | S 16 | S 16 | S 16 | S 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 12 | S 11 | ESE 10 | S 10 | S 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 |
Wave Graph | |||||||||||||||||||||
1847 | 2369 | 2605 | 2632 | 2410 | 2294 | 1774 | 1411 | 642 | 289 | 313 | 176 | 151 | 65 | 98 | 54 | 106 | 138 | 190 | 212 | 151 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on |
High Tide | 2:21PM1.09m | 11:39PM1.34m | 3:42PM1.20m | 00:41AM1.37m | 4:34PM1.30m | 1:44AM1.42m | 5:16PM1.35m | 2:44AM1.47m | 5:52PM1.37m | 3:40AM1.51m | 6:24PM1.37m | 4:33AM1.52m | 6:54PM1.36m | ||||||||
Low Tide | 5:47PM1.02m | 7:44AM0.22m | 7:27PM1.09m | 8:43AM0.08m | 8:45PM1.11m | 9:36AM-0.02m | 9:42PM1.09m | 10:24AM-0.09m | 10:29PM1.03m | 11:09AM-0.09m | 11:12PM0.96m | 11:51AM-0.03m | 11:55PM0.87m | ||||||||
4:31 | — | — | 4:31 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:35 | — | — | |
— | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | |
mm | — | — | — | — | — | — | — | — | 8 | 3 | — | 2 | — | — | — | — | — | — | — | — | 2 |
Temp °C | 25 | 24 | 24 | 25 | 25 | 24 | 26 | 25 | 25 | 27 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 25 | 27 | 27 | 26 |
Feels °C | 26 | 24 | 25 | 26 | 24 | 24 | 28 | 26 | 26 | 29 | 26 | 27 | 28 | 28 | 27 | 29 | 28 | 29 | 29 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | S 15 | S 16 | S 16 | S 16 | S 16 | S 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 12 | S 11 | ESE 10 | S 10 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | SSE 11 | ESE 8 |
1847 | 2369 | 2605 | 2632 | 2410 | 2294 | 1774 | 1411 | 642 | 289 | 313 | 176 | 151 | 65 | 98 | 54 | 106 | 138 | 190 | 38 | 151 | |
Swell 2 Height (m) Direction Period (s) | ESE 8 | ESE 10 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | ESE 9 | S 5 | ESE 9 | ESE 9 | ESE 9 | SSW 11 | ESE 10 | S 10 | SSW 9 | SSW 9 | S 6 | S 6 | S 8 |
65 | 107 | 60 | 59 | 40 | 40 | 40 | 40 | 26 | 16 | 27 | 26 | 26 | 65 | 63 | 49 | 29 | 27 | 7 | 6 | 140 | |
Swell 3 Height (m) Direction Period (s) | NE 8 | — | ESE 9 | — | E 9 | SSE 9 | SE 10 | SE 11 | SE 10 | ESE 9 | ESE 6 | ESE 5 | SE 12 | S 15 | S 15 | SE 10 | SSE 11 | S 13 | SSW 9 | SSW 8 | SSW 8 |
2 | — | 90 | — | 58 | 35 | 28 | 29 | 25 | 27 | 6 | 3 | 22 | 4 | 4 | 33 | 12 | 3 | 8 | 7 | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 4 | S 4 | S 4 | — | SSW 4 | — | — | — | — | S 6 | — | — | — | — | — | ESE 9 | — |
— | — | — | — | 9 | 22 | 13 | — | 7 | — | — | — | — | 41 | — | — | — | — | — | 212 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 9 | 17 | 88 | 9 | 101 | 57 | 18 | 86 | 2 | 51 | 0 | 0 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 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.










