
Surf Forecasts:
Onjuku surf forecast from 8 Jul 2026:
- Best quality surf: Thursday 9 Jul, 6AM (local time) - 6ft (1.9m), 14s period, SSE swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 9AM (local time) - 7ft (2.2m), 17s period, S swell with 2,867 kJ wave energy.
- Next surfable swell (1★+): Thursday 9 Jul, 6AM (local time) - 6ft (1.9m), 14s period with SSE 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 Thursday (Jul 09) at 6AM. The primary swell is predicted to be 1.9m and 14s period with a secondary swell of 0.9m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 2.2m 17s and forecast to arrive on Saturday (Jul 11) at 9AM. 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+) | 6AM (Thu 9th Jul) | 6ft (1.9m) 14s |
| Best Surf | 6AM (Thu 9th Jul) | 6ft (1.9m) 14s |
| Most Powerful | 9AM (Sat 11th Jul) | 7ft (2.2m) 17s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Alright, Rusty here with a look at what we've got coming up at Onjuku. The water's a bit colder than normal for this time of year, sitting at 73°.
Wednesday morning is the real standout. We've got a solid 7ft groundswell rolling in from the SE at a long 16 seconds, with a clean, light cross-off breeze from the ENE. The combined energy is strong at 2473, and conditions are set to be clean. This is going to be the pick of the period, with excellent surf for experienced surfers. The swell's pushing over 5ft, so it's a bit much for beginners, but for anyone with some time in the water, it's worth getting wet. Crowds are possible here, so get out early.
Wednesday afternoon sees a slight shift – the wind swings more easterly and gets a bit stronger, turning cross-shore. The swell holds at 7ft from the SSE, but the quality drops off, with the report calling it marginal.
Thursday morning is still clean and clear, but the swell has dropped to 6ft from the SSE, and the wind is a light cross-onshore. It's okay, but not a patch on Wednesday morning. By Thursday afternoon, the wind turns fully onshore, and the wave quality takes another hit.
Friday and Saturday look messy. We've got solid 7 to 7ft southerly swells, but the wind is strong and onshore – especially Friday afternoon and all day Saturday, where it gets up to 12 mph or more. The surf is going to be blown-out and choppy. The combined energy is still high, hitting 2962 on Saturday morning, but with that wind, it's not good for a paddle.
Sunday is similar – a dropping swell with moderate onshore winds. Not worth rushing for.
Monday and Tuesday of the following week see the swell drop right off, with only 2ft to 4ft of weak energy and onshore winds. It's a flat spell with poor conditions.
Wednesday, the 15th of July, shows a bit of life again, with a 6ft SSE swell and light onshore wind – marginal, but a step up from the flat days before.
Now, into the second week, things get interesting again. From the 19th of July, we see a building swell. Sunday morning the 19th has a clean 5ft SE swell with a cross-off wind – a promising option. By Sunday afternoon, it's building to 7ft from the SE with a 16-second period and clean wind. The energy is strong at 2610. That's another good window to watch.
Then, on Monday the 20th of July, the swell jumps to a massive 13ft from the ESE. The wind is clean and cross-off, but that is way too big for Onjuku. The report says the swell is predicted to be too big for this break – that's expert-only territory at a spot like this, and even then, it's a serious call. The combined energy is 7948, which is very strong. If you're not a seasoned charger, stay on the beach.
Tuesday the 21st of July morning is glassy, with an 12ft E swell. Again, that's a heavy 12ft – too big for most. The wind is calm, but the size is the story.
After that, Wednesday and Thursday of that week have some cleaner, cross-off wind conditions with swells around 5ft to 8ft, but the energy drops off and the wind picks up to a fresh breeze. It's a mixed bag, but Saturday the 18th and Tuesday the 23rd are likely to be the best of those final days, with clean conditions, though the swell is inconsistent.
Overall, lock in this Wednesday morning as the clear winner. The Sunday the 19th afternoon and maybe the morning of the 23rd are the other windows worth keeping an eye on, but with longer range forecasts, those are a bit less certain.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri morning, min 22°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 24mm), heaviest during Mon night. Warm (max 26°C on Sun morning, min 22°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wed 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SSE 15 | SSE 15 | SSE 14 | SSE 13 | S 14 | S 15 | S 16 | S 17 | S 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | S 6 | ESE 10 | ESE 9 |
Wave Graph | |||||||||||||||||||||
2140 | 1559 | 1306 | 828 | 1663 | 1847 | 2339 | 2669 | 2867 | 2750 | 2187 | 1631 | 1121 | 773 | 312 | 150 | 173 | 93 | 120 | 157 | 165 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | off | cross-off | cross | cross |
High Tide | 10:03PM1.33m | 12:13PM1.01m | 10:46PM1.33m | 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 | ||||||||
Low Tide | 3:24PM0.73m | 5:27AM0.49m | 4:20PM0.89m | 6:39AM0.36m | 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 | |||||||
— | — | 4:31 | — | — | 4:31 | — | — | 4:31 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | |
6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:53 | — | 6:52 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 5 | 5 | 11 | — | — | — | 3 |
Temp °C | 24 | 23 | 25 | 25 | 24 | 26 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 24 | 25 | 24 | 23 | 23 | 24 | 24 | 25 |
Feels °C | 25 | 25 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 26 | 26 | 25 | 27 | 25 | 26 | 26 | 27 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SSE 15 | SSE 15 | SSE 14 | SSE 13 | S 14 | S 15 | S 16 | S 17 | S 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 13 | S 5 | SSW 11 | SSW 11 | ESE 10 | ESE 10 | ESE 9 |
2140 | 1559 | 1306 | 828 | 1663 | 1847 | 2339 | 2669 | 2867 | 2750 | 2187 | 1631 | 1121 | 773 | 312 | 36 | 173 | 93 | 61 | 157 | 165 | |
Swell 2 Height (m) Direction Period (s) | E 8 | E 8 | ESE 8 | S 15 | ESE 8 | ESE 8 | ESE 10 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 9 | ESE 9 | SSW 12 | ESE 8 | ESE 8 | SSW 11 | SSW 6 | S 6 |
120 | 124 | 94 | 545 | 85 | 68 | 103 | 60 | 59 | 40 | 39 | 40 | 39 | 40 | 27 | 150 | 41 | 24 | 37 | 36 | 20 | |
Swell 3 Height (m) Direction Period (s) | — | E 8 | S 18 | ESE 8 | E 8 | NE 7 | — | E 9 | — | SSE 11 | — | SE 11 | SE 11 | SE 10 | SE 10 | ESE 9 | SSE 9 | SE 5 | SE 12 | SSW 10 | SSW 10 |
— | 120 | 226 | 81 | 100 | 2 | — | 81 | — | 44 | — | 19 | 29 | 16 | 26 | 26 | 9 | 10 | 6 | 20 | 18 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SSW 4 | SSW 4 | SSW 4 | S 5 | — | SW 5 | — | S 6 | — | — |
— | — | — | — | — | — | — | — | — | — | — | 13 | 25 | 21 | 32 | — | 12 | — | 120 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 9 | 9 | 9 | 9 | 9 | 9 | 17 | 200 | 17 | 23 | 88 | 205 | 9 | 9 | 17 | 2 | 0 | 0 | 9 | 51 |
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.











