Surf Forecasts:
Onjuku surf forecast from 1 Oct 2026:
- Best quality surf: Monday 5 Oct, 3PM (local time) - 11ft (3.5m), 17s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 7 Oct, 6AM (local time) - 21ft (6.5m), 18s period, SE swell with 28,372 kJ wave energy.
- Next surfable swell (1★+): Monday 5 Oct, 6AM (local time) - 6.5ft (2.0m), 17s 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 Monday (Oct 05) at 6AM. The primary swell is predicted to be 2.0m and 17s period with a secondary swell of 1.7m and 9s. Another secondary swell of 1.9m and 9s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 6.5m 18s and forecast to arrive on Wednesday (Oct 07) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 11s period and expected on Wednesday (Oct 07) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 5th Oct) | 6.5ft (2.0m) 17s |
| Best Surf | 3PM (Mon 5th Oct) | 11ft (3.5m) 17s |
| Most Powerful | 6AM (Wed 7th Oct) | 21ft (6.5m) 18s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri afternoon. Warm (max 24°C on Thu afternoon, min 18°C on Fri night). Winds increasing (calm on Thu afternoon, fresh winds from the NE by Fri afternoon). | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Tue afternoon. Warm (max 23°C on Mon morning, min 19°C on Sun night). Mainly near gales. | |||||||||||||||||||
Thu 1 | Friday 2 | Saturday 3 | Sunday 4 | Monday 5 | Tuesday 6 | Wednesday 7 | ||||||||||||||
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) | SSE 9 | SSE 8 | SSE 7 | SSE 6 | ENE 7 | ESE 8 | E 7 | E 8 | E 8 | E 8 | SSE 16 | SSE 16 | SE 17 | SSE 17 | SE 17 | SE 18 | SSE 18 | SE 17 | SE 14 | ENE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 579 | 173 | 59 | 31 | 276 | 35 | 215 | 172 | 251 | 266 | 859 | 2573 | 6962 | 7803 | 12541 | 16147 | 23135 | 19468 | 2944 | 1293 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | off | cross-on | cross |
High Tide | 6:06PM1.46m | 8:47AM1.13m | 6:33PM1.41m | 11:07AM1.07m | 7:04PM1.34m | 7:50PM1.23m | 2:34PM1.20m | 10:55PM1.14m | 2:44PM1.25m | 1:06AM1.18m | 3:00PM1.29m | 2:19AM1.27m | ||||||||
Low Tide | 1:32AM0.18m | 12:43PM0.99m | 2:31AM0.26m | 12:36PM1.07m | 3:55AM0.34m | 5:42AM0.38m | 7:23PM1.08m | 7:07AM0.37m | 8:09PM0.92m | 8:05AM0.37m | 8:43PM0.74m | |||||||||
 |  |  | |  | |  | |  | | | | |  | |  | | | | | |
 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — |
 | 5:22 | — | — | 5:22 | — | — | 5:21 | — | — | 5:19 | — | — | 5:17 | — | — | 5:15 | — | — | 5:15 | — |
mm | — | — | 2 | 3 | 1 | — | — | — | — | — | — | — | — | 2 | — | 10 | 2 | — | — | 2 |
Temp °C | 24 | 24 | 23 | 20 | 19 | 19 | 20 | 20 | 21 | 21 | 20 | 23 | 23 | 22 | 22 | 22 | 21 | 23 | 22 | 21 |
Feels °C | 25 | 27 | 22 | 16 | 14 | 14 | 15 | 17 | 17 | 17 | 17 | 22 | 22 | 21 | 20 | 19 | 14 | 22 | 21 | 19 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SSE 8 | SSE 7 | SSE 6 | SE 16 | ESE 8 | ESE 15 | SE 10 | SE 10 | SE 12 | ESE 8 | SSE 16 | SE 17 | SSE 17 | SE 17 | SE 18 | SSE 18 | SE 17 | SE 14 | ENE 12 |
| kJ | 579 | 173 | 59 | 31 | 10 | 35 | 21 | 16 | 53 | 140 | 376 | 2573 | 6962 | 7803 | 12541 | 16147 | 23135 | 19468 | 2944 | 1293 |
Swell 2 Height (m) Direction Period (s) | E 8 | ENE 6 | E 8 | SE 9 | E 12 | ESE 15 | SE 12 | SE 14 | ESE 16 | SSE 15 | SSE 16 | ESE 9 | ESE 13 | E 8 | E 10 | — | — | NE 11 | ENE 12 | SE 12 |
| kJ | 23 | 21 | 12 | 13 | 3 | 21 | 5 | 32 | 84 | 89 | 859 | 456 | 60 | 347 | 405 | — | — | 1802 | 1403 | 1031 |
Swell 3 Height (m) Direction Period (s) | E 18 | E 8 | E 11 | SE 16 | E 12 | E 11 | E 12 | E 17 | SSE 14 | ESE 16 | SSE 19 | E 14 | E 13 | ESE 13 | — | — | — | — | ESE 13 | ESE 20 |
| kJ | 6 | 22 | 9 | 10 | 11 | 9 | 3 | 22 | 36 | 82 | 475 | 104 | 88 | 57 | — | — | — | — | 1319 | 37 |
Wind waves Height (m) Direction Period (s) | NE 6 | — | ENE 5 | ENE 6 | ENE 7 | ENE 6 | E 7 | E 8 | E 8 | E 8 | — | ESE 9 | — | NNE 4 | NNE 5 | NE 6 | NE 8 | NNE 11 | — | — |
| kJ | 60 | — | 46 | 144 | 276 | 119 | 215 | 172 | 251 | 266 | — | 653 | — | 46 | 54 | 401 | 1231 | 4021 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 9 | 240 | 240 | 206 | 206 | 56 | 51 | 51 | 51 | 22 | 0 | 69 | 75 | 200 | 631 | 631 | 51 | 9 | 82 |
Best forecast wave conditions in Chiba | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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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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