Surf Forecasts:
Onjuku surf forecast from 9 Jul 2026:
- Best quality surf: Monday 13 Jul, 12PM (local time) - 3.5ft (1.0m), 12s period, S 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 S 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, Rusty here, lookin’ at the Onjuku stretch for the next couple of weeks. Gotta be honest, it’s a tough start for the lineup. The water’s runnin’ a bit colder than normal for this time of year, sittin’ at 74°, so toss on an extra layer if you’re paddlin’ out.
We’ve got a serious run of onshore, choppy junk from the get-go, and not much to get excited about for a solid stretch. The first real chance of a wave doesn’t show up until the morning of Friday the 24th of July. That’s a full two-week gap of meagre, messy conditions before we see a glimmer of hope. The wait is brutal.
So, let’s cut to the one true standout in this whole forecast. It’s the morning of Friday the 24th. Onjuku’s gonna see a solid 7ft of swell from the ESE, with a moderate 11-second period. The combined energy is a strong 1103, and the real kicker is the wind: a clean offshore breeze from the NE at 16 mph. That’ll groom the face up nicely. This is a proper groundswell, and those longer-period waves will have some punch, but at a beach break, it might be a bit too straight. For the experienced surfer who knows the bank, it’s the best session on offer. The morning of Saturday the 25th still has some clean 5ft leftovers from the ESE with a fresh offshore, but it’s smaller and less consistent.
Right now, I’d be marking that Friday morning on the calendar. Everything else is a write-off. This is one of those forecasts where you’ve just gotta be patient and wait for that one window.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest 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 2mm), mostly falling on Mon morning. Warm (max 26°C on Mon afternoon, min 24°C on Mon morning). 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 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1847 | 2159 | 2605 | 2632 | 2410 | 2339 | 1730 | 1591 | 752 | 356 | 248 | 186 | 126 | 65 | 45 | 61 | 71 | 88 | 90 | 88 | 86 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross | cross | on | cross-on | on | on | on | on | on | on | on | 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 | — | — | — | — | — | — | — | — | 10 | 2 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 23 | 25 | 25 | 24 | 26 | 25 | 26 | 25 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 25 | 27 | 27 | 25 |
Feels °C | 26 | 26 | 24 | 26 | 25 | 24 | 27 | 27 | 30 | 29 | 28 | 27 | 28 | 28 | 26 | 28 | 27 | 27 | 30 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | S 15 | S 16 | S 16 | S 16 | S 16 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
| kJ | 1847 | 2159 | 2605 | 2632 | 2410 | 2339 | 1730 | 1591 | 752 | 356 | 248 | 186 | 126 | 65 | 45 | 61 | 71 | 88 | 90 | 88 | 86 |
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 | E 9 | ESE 9 | ESE 9 | ESE 8 | E 9 | SSW 10 | SSW 10 | SE 10 | S 13 | SSW 9 | SW 8 | SSW 8 |
| kJ | 65 | 107 | 60 | 59 | 40 | 40 | 40 | 40 | 26 | 41 | 27 | 26 | 41 | 40 | 33 | 19 | 26 | 3 | 15 | 18 | 7 |
Swell 3 Height (m) Direction Period (s) | NE 8 | — | ESE 9 | — | E 9 | SE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 6 | SE 5 | SE 12 | SE 12 | SE 10 | SE 10 | S 13 | S 13 | S 13 | SE 11 | SSE 11 |
| kJ | 2 | — | 90 | — | 58 | 43 | 28 | 28 | 25 | 23 | 8 | 4 | 22 | 35 | 26 | 25 | 4 | 3 | 3 | 5 | 11 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 4 | SSW 4 | SSW 4 | — | — | — | — | SW 5 | WSW 5 | S 4 | S 5 | SSW 5 | SSW 5 | SSW 5 | SSW 4 | SSW 4 | SSW 4 |
| kJ | — | — | — | — | 9 | 31 | 15 | — | — | — | — | 6 | 2 | 23 | 36 | 31 | 37 | 37 | 20 | 18 | 20 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 9 | 9 | 557 | 17 | 101 | 23 | 17 | 9 | 2 | 17 | 9 | 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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