Surf Forecasts:
Onjuku surf forecast from 11 Jul 2026:
- Best quality surf: Monday 13 Jul, 9AM (local time) - 3.5ft (1.1m), 13s period, SSW swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 3PM (local time) - 7ft (2.1m), 16s period, S swell with 2,410 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 9AM (local time) - 3.5ft (1.1m), 13s 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 9AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.4m and 9s. Another secondary swell of 0.9m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 2.1m 16s and forecast to arrive on Saturday (Jul 11) at 3PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 13th Jul) | 3.5ft (1.1m) 13s |
| Best Surf | 9AM (Mon 13th Jul) | 3.5ft (1.1m) 13s |
| Most Powerful | 3PM (Sat 11th Jul) | 7ft (2.1m) 16s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
G’day, I’m Rusty. Let’s talk surf at Onjuku for the next couple of weeks. First week’s a bit messy, but the second weekend has some real promise.
Saturday the 11th and Sunday the 12th? Forget it. There’s decent swell – about 7ft to 7ft from the south and south-southwest, with a long 16-second period – plenty of energy (2691). But the wind is blowing hard, cross-on and onshore at 12 to 16 mph, making everything choppy. Water temp is 75°, pretty normal for this time of year.
The big standout is Monday morning, 13th July. Swell drops to a nice 4ft from the south-southwest, still with a good 13-second period. Energy is moderate (517). The wind goes glassy – just a light 3 mph breeze from the north-northwest – so expect clean, fun waves. Get out there early.
After Monday, it goes small and ordinary through Thursday the 17th. Swell drops below 3ft, periods shorten under 10 seconds, and the wind stays onshore or cross-on. Not much doing. From Friday 18th through Tuesday 21st, we see a bit more size (2ft to 4ft) but the wind and chop keep things average.
Another standout shapes up for Wednesday morning, 22nd July. Swell jumps to 6ft from the southeast (13-second period), with strong energy (1194). Wind is very light from the south-southeast – almost offshore – keeping things clean for experienced surfers. This is the pick of the mid-week.
But if you can hold out, Sunday 26th July is the best. Swell builds to a solid 8ft from the southeast, with a long 14-second period – energy is pumping (2274). Wind is cross-offshore from the northeast at 9 mph, keeping the faces clean. This is excellent for experienced surfers – anything over 8ft is for experts only, and the next day’s forecast is close to that. So Sunday morning is your window.
Onjuku is exposed to south-southeast swells, so that’s what we’re seeing. It’s inconsistent, so when it fires like it might on the 26th, you don’t want to miss it. Crowds can sometimes show up – get there early and you’ll be fine.
That’s the rundown. Keep an eye on Sunday the 26th – it’s got me stoked.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Sun night. Warm (max 28°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed morning, min 24°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
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 16 | S 16 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | S 10 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 9 | ESE 9 | ESE 8 | SSE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2632 | 2410 | 2133 | 1938 | 1591 | 651 | 424 | 313 | 100 | 123 | 86 | 51 | 65 | 124 | 161 | 141 | 134 | 141 | 137 | 94 | 191 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | glassy | cross | cross-off | cross-off | cross | glassy | cross-on | cross-on | on | on | on | on | on | on | on |
High Tide | 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 | 5:24AM1.49m | 7:20PM1.34m | ||||||||
Low Tide | 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 | 12:29PM0.08m | 00:40AM0.77m | ||||||||
 | |  |  |  |  |  |  |  | | | |  | |  | | | | | | | |
 | 4:31 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:35 | — | — | 4:35 | — | — |
 | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | 2 | 11 | 1 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 28 | 25 | 26 | 26 | 24 | 27 | 27 | 25 | 27 | 27 | 26 | 28 | 28 | 26 |
Feels °C | 26 | 25 | 25 | 27 | 26 | 26 | 29 | 31 | 28 | 29 | 29 | 27 | 30 | 29 | 28 | 29 | 29 | 30 | 30 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 16 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | S 7 | SSW 11 | SSW 10 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 9 | ESE 9 | ESE 8 | SSE 8 |
| kJ | 2632 | 2410 | 2133 | 1938 | 1591 | 651 | 424 | 313 | 51 | 123 | 86 | 50 | 65 | 124 | 161 | 141 | 134 | 141 | 137 | 94 | 191 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | E 9 | SSW 5 | ESE 9 | ESE 9 | SSW 11 | ESE 9 | ESE 8 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SE 9 | SE 10 | ESE 8 |
| kJ | 59 | 40 | 40 | 40 | 40 | 28 | 27 | 27 | 100 | 26 | 22 | 51 | 32 | 29 | 16 | 15 | 14 | 7 | 21 | 23 | 90 |
Swell 3 Height (m) Direction Period (s) | — | SSE 9 | SSE 9 | SE 10 | SE 10 | ESE 9 | SE 10 | SE 10 | ESE 9 | SE 12 | SE 12 | SE 10 | SE 10 | ENE 9 | S 13 | SE 5 | SE 10 | SE 10 | SSW 8 | SSW 8 | SE 14 |
| kJ | — | 58 | 35 | 28 | 26 | 27 | 24 | 15 | 26 | 22 | 35 | 26 | 24 | 26 | 3 | 1 | 28 | 14 | 7 | 6 | 7 |
Wind waves Height (m) Direction Period (s) | — | S 4 | SSW 4 | SSW 4 | SSW 4 | SSW 5 | SW 5 | — | — | — | — | — | — | SSE 2 | — | S 5 | SE 5 | — | S 3 | SSE 7 | — |
| kJ | — | 9 | 24 | 28 | 37 | 51 | 42 | — | — | — | — | — | — | 1 | — | 2 | 1 | — | 3 | 78 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 557 | 9 | 88 | 18 | 205 | 22 | 0 | 12 | 0 | 0 | 9 | 0 | 9 | 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.
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