Surf Forecasts:
Onjuku surf forecast from 23 Jul 2026:
- Best quality surf: Friday 24 Jul, 9AM (local time) - 2ft (0.6m), 9s period, E swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 3PM (local time) - 3ft (0.9m), 8s period, ENE swell with 96 kJ wave energy.
- Next surfable swell (1★+): Friday 24 Jul, 9AM (local time) - 2ft (0.6m), 9s period with E 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 Friday (Jul 24) at 9AM. The primary swell is predicted to be 0.6m and 9s 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 0.9m 8s and forecast to arrive on Tuesday (Jul 28) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Jul 24) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Fri 24th Jul) | 2ft (0.6m) 9s |
| Best Surf | 9AM (Fri 24th Jul) | 2ft (0.6m) 9s |
| Most Powerful | 3PM (Tue 28th Jul) | 3ft (0.9m) 8s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the horizon for the local stretch.
First up, the honest truth: the next week or so is flat. Real flat. We’re talking tiny, weak waves from the 24th of July right through to the 3rd of August. The swell energy is barely in the double digits for most of that, with a measly 128 (weak) on the Friday morning, and it just doesn’t get any better. You’ll be staring at a glassy, clean surface with no push. It’s a proper lull, so don’t bother paddling out unless you’re just floating.
But hang on to your leash, because from the 4th of August things wake up. And I mean *wake up*. On Tuesday the 4th morning, we see a solid 8 ft SE groundswell rolling in with a long 16-second period. The wind is light and cross-offshore, making it clean. The combined energy jumps to 2854 (strong), and that’s the real deal. This is proper, powerful groundswell – the kind that hums under the board. The morning is the pick, with glassy conditions and a decent wall. It’s a bit big for the learners, but for the experienced crew, this is the standout of the whole outlook.
The Wednesday the 5th keeps it pumping with 8 ft to 10 ft SE swell, same long period, but the wind picks up to a moderate breeze. Still clean, but the bigger size pushes it towards expert territory. By Thursday the 6th, we’re looking at 10 ft+ and the swell is getting too big for this break, with the wind cranking. Thursday afternoon and Friday the 7th are just massive – 16 ft to 20 ft SE swell, with a 17-18 second period and strong, messy cross-shore winds. That’s more of a big-wave show than a paddle session. Combined energy hits 16153 (very strong) on Friday morning. This is for the elite only, and even then, it’s a wild one. If you’re not a charger, steer clear.
The water temperature is sitting at 79°, about average for this time of year, so no surprises there.
The one true standout in this whole 16-day window is definitely the Tuesday morning, 4th of August. That’s your window. Clean, solid, powerful groundswell, with that long period making the waves hold up. It’s a rare gem in a flat spell, so if you can, get out there.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Sat night. Warm (max 28°C on Fri morning, min 23°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Mon afternoon. Warm (max 29°C on Mon morning, min 22°C on Wed afternoon). Wind will be generally light. | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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) | E 9 | SE 11 | SE 16 | SE 10 | SE 16 | SE 10 | SE 15 | SE 15 | SE 14 | SE 14 | SE 10 | SE 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 57 | 57 | 66 | 48 | 63 | 50 | 55 | 64 | 72 | 70 | 63 | 63 | 78 | 96 | 73 | 47 | 47 | 53 | 65 | 67 | 61 |
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-off | cross-off | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross | glassy | cross-off | cross-off | cross-off | off | cross-off | glassy |
High Tide | 11:05PM1.26m | 4:30PM1.13m | 00:24AM1.25m | 4:42PM1.19m | 1:35AM1.28m | 5:00PM1.23m | 2:32AM1.33m | 5:21PM1.27m | 3:19AM1.38m | 5:42PM1.30m | 4:01AM1.42m | 6:03PM1.32m | |||||||||
Low Tide | 7:51AM0.37m | 7:16PM1.10m | 8:43AM0.30m | 8:40PM1.07m | 9:26AM0.23m | 9:28PM1.02m | 10:04AM0.17m | 10:04PM0.97m | 10:37AM0.13m | 10:38PM0.90m | 11:08AM0.12m | 11:11PM0.83m | |||||||||
 | |  |  | |  | | | |  | |  |  | |  | |  | | | |  | |
 | 4:39 | — | — | 4:41 | — | — | 4:41 | — | — | 4:43 | — | — | 4:43 | — | — | 4:43 | — | — | 4:45 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — |
mm | — | — | — | 4 | 2 | 9 | — | 1 | 4 | — | 4 | 1 | — | — | 1 | 3 | 3 | 1 | — | — | — |
Temp °C | 28 | 28 | 26 | 28 | 28 | 25 | 26 | 26 | 26 | 29 | 26 | 23 | 25 | 26 | 25 | 25 | 23 | 22 | 24 | 25 | 24 |
Feels °C | 32 | 31 | 30 | 34 | 33 | 28 | 29 | 29 | 31 | 33 | 26 | 23 | 27 | 29 | 28 | 29 | 24 | 24 | 25 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 8 | SE 10 | SE 10 | E 6 | E 6 | E 5 | ENE 7 | SE 10 | SE 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 |
| kJ | 57 | 39 | 36 | 35 | 49 | 50 | 22 | 22 | 20 | 36 | 63 | 63 | 78 | 96 | 73 | 47 | 47 | 53 | 65 | 67 | 61 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 11 | SE 10 | SE 4 | E 8 | E 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 14 | SSW 6 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 |
| kJ | 22 | 57 | 51 | 7 | 34 | 34 | 53 | 64 | 53 | 51 | 47 | 12 | 63 | 35 | 34 | 33 | 32 | 31 | 31 | 33 | 23 |
Swell 3 Height (m) Direction Period (s) | SE 18 | SE 17 | SE 16 | SE 10 | SE 16 | SE 4 | SE 15 | SE 15 | SE 14 | SE 14 | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 |
| kJ | 49 | 43 | 66 | 48 | 63 | 6 | 55 | 54 | 72 | 70 | 12 | 13 | 24 | 14 | 23 | 14 | 13 | 13 | 11 | 11 | 5 |
Wind waves Height (m) Direction Period (s) | NE 3 | E 3 | ESE 4 | SE 4 | SE 4 | — | — | — | — | — | NE 7 | NE 7 | — | SE 5 | — | — | — | — | — | — | SSW 3 |
| kJ | 3 | 4 | 10 | 7 | 7 | — | — | — | — | — | 54 | 56 | — | 1 | — | — | — | — | — | — | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 9 | 9 | 9 | 9 | 0 | 0 | 9 | 9 | 0 | 56 | 24 | 0 | 56 | 0 | 0 | 206 | 0 | 0 | 0 | 0 |
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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