Surf Forecasts:
Onjuku surf forecast from 20 Oct 2026:
- Best quality surf: Tuesday 27 Oct, 12PM (local time) - 11ft (3.5m), 9s period, SW swell with cross-shore winds.
- Most powerful swell: Tuesday 27 Oct, 12PM (local time) - 11ft (3.5m), 9s period, SW swell with 1,854 kJ wave energy.
- Next surfable swell (1★+): Sunday 25 Oct, 3AM (local time) - 6ft (1.9m), 8s period with SE 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 Sunday (Oct 25) at 3AM. The primary swell is predicted to be 1.9m and 8s period with a secondary swell of 0.9m and 15s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 3.5m 9s and forecast to arrive on Tuesday (Oct 27) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Thursday (Oct 22) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 25th Oct) | 6ft (1.9m) 8s |
| Best Surf | 12PM (Tue 27th Oct) | 11ft (3.5m) 9s |
| Most Powerful | 12PM (Tue 27th Oct) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Short Range ForecastMostly dry. Warm (max 26°C on Wed morning, min 16°C on Thu night). Mainly strong winds. | Days 5-7 Weather SummaryHeavy rain (total 37mm), heaviest during Sat morning. Warm (max 22°C on Sun morning, min 17°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | ||||||||||||||
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) | SE 12 | SSE 14 | SSW 7 | S 15 | S 14 | S 13 | S 12 | S 13 | S 14 | S 13 | SSW 14 | SSW 15 | SE 8 | SSW 15 | SSW 14 | ESE 9 | E 9 | ESE 9 | ESE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 330 | 276 | 506 | 648 | 1057 | 704 | 290 | 451 | 462 | 366 | 366 | 411 | 634 | 242 | 236 | 144 | 274 | 248 | 325 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-on | cross-on |
High Tide | 11:21PM1.04m | 2:04PM1.22m | 1:08AM1.10m | 2:21PM1.28m | 2:11AM1.19m | 2:40PM1.33m | 3:01AM1.28m | 3:00PM1.38m | 3:47AM1.36m | 3:22PM1.43m | 4:32AM1.41m | 3:45PM1.47m | |||||||
Low Tide | 6:44AM0.53m | 8:00PM0.83m | 7:36AM0.51m | 8:27PM0.67m | 8:18AM0.52m | 8:55PM0.50m | 8:56AM0.55m | 9:25PM0.34m | 9:32AM0.60m | 9:57PM0.19m | 10:06AM0.68m | 10:31PM0.07m | |||||||
 |  |  |  | |  | | | |  |  | |  | | | |  | |  | |
 | — | 5:48 | — | — | 5:48 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — |
 | — | — | 4:57 | — | — | 4:55 | — | — | 4:53 | — | — | 4:52 | — | — | 4:52 | — | — | 4:51 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | 11 | 11 | 9 | — | — | — | 3 | 2 | 1 |
Temp °C | 24 | 26 | 26 | 25 | 20 | 17 | 17 | 17 | 18 | 20 | 18 | 19 | 19 | 22 | 22 | 22 | 19 | 21 | 24 |
Feels °C | 24 | 22 | 22 | 20 | 16 | 12 | 12 | 12 | 15 | 19 | 17 | 16 | 18 | 23 | 22 | 22 | 17 | 19 | 20 |
Swell 1 Height (m) Direction Period (s) | SE 12 | SE 11 | SSE 13 | SSE 12 | S 14 | S 13 | S 12 | S 13 | S 14 | S 13 | SSW 14 | SSW 15 | SE 8 | ESE 7 | ESE 8 | ESE 9 | SSW 12 | ESE 9 | ESE 7 |
| kJ | 330 | 229 | 506 | 477 | 1057 | 704 | 290 | 451 | 462 | 366 | 366 | 411 | 634 | 234 | 165 | 144 | 56 | 248 | 325 |
Swell 2 Height (m) Direction Period (s) | S 16 | SSE 14 | S 18 | S 15 | SW 7 | SE 8 | S 15 | SE 9 | SE 8 | ESE 6 | ESE 10 | ESE 10 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | — | SW 12 | SSW 11 |
| kJ | 190 | 276 | 304 | 648 | 50 | 35 | 221 | 65 | 41 | 40 | 39 | 40 | 334 | 242 | 236 | 135 | — | 34 | 23 |
Swell 3 Height (m) Direction Period (s) | NE 10 | S 18 | ESE 8 | SE 10 | SE 9 | SW 7 | SE 8 | — | SE 10 | SE 8 | — | — | — | — | — | — | N 10 | S 15 | S 15 |
| kJ | 4 | 103 | 48 | 25 | 51 | 7 | 44 | — | 76 | 54 | — | — | — | — | — | — | 2 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 7 | SSW 8 | NE 4 | NE 6 | NE 6 | ENE 6 | E 6 | — | ESE 8 | SE 7 | — | N 4 | — | — | E 9 | — | SW 11 |
| kJ | 69 | 207 | 505 | 319 | 39 | 195 | 154 | 77 | 78 | — | 179 | 268 | — | 10 | — | — | 274 | — | 233 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 557 | 557 | 554 | 51 | 205 | 51 | 51 | 68 | 51 | 51 | 554 | 22 | 0 | 0 | 0 | 103 | 73 | 200 |
Best forecast wave conditions in Chiba | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Onjuku surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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