Surf Forecasts:
Onjuku surf forecast from 26 Oct 2026:
- Best quality surf: Saturday 31 Oct, 9AM (local time) - 3.5ft (1.1m), 18s period, SE swell with cross-offshore winds.
- Most powerful swell: Saturday 31 Oct, 3PM (local time) - 5.5ft (1.7m), 16s period, SE swell with 1,519 kJ wave energy.
- Next surfable swell (1★+): Tuesday 27 Oct, 9AM (local time) - 4.5ft (1.4m), 8s 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 Tuesday (Oct 27) at 9AM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.7m and 7s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onjuku in the next 16 days are 1.7m 16s and forecast to arrive on Saturday (Oct 31) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Saturday (Oct 31) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Tue 27th Oct) | 4.5ft (1.4m) 8s |
| Best Surf | 9AM (Sat 31st Oct) | 3.5ft (1.1m) 18s |
| Most Powerful | 3PM (Sat 31st Oct) | 5.5ft (1.7m) 16s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Short Range ForecastModerate rain (total 18mm), heaviest on Thu night. Warm (max 20°C on Tue afternoon, min 14°C on Wed night). Winds decreasing (fresh winds from the N on Wed morning, light winds from the WSW by Thu night). | Days 4-6 Weather SummaryHeavy rain (total 86mm), heaviest during Fri afternoon. Warm (max 21°C on Sun night, min 14°C on Sat night). Winds increasing (light winds from the W on Fri morning, strong winds from the SW by Sun night). | ||||||||||||||||||||
Tuesday 27 | Wednesday 28 | Thursday 29 | Friday 30 | Saturday 31 | Sunday 1 | Monday 2 | |||||||||||||||
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 8 | S 8 | S 8 | NE 7 | NE 8 | NE 8 | SE 14 | SE 13 | SSE 8 | SSE 8 | SSE 8 | SE 8 | SE 18 | SE 16 | SE 14 | SE 13 | SSE 14 | SSE 12 | SSE 11 | SW 8 | SSE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 223 | 100 | 113 | 132 | 91 | 132 | 74 | 87 | 749 | 887 | 824 | 418 | 726 | 1519 | 902 | 600 | 845 | 1407 | 416 | 1225 | 308 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | off | off | cross-off | cross | cross-on | cross-on | cross | on | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-off | off |
High Tide | 4:10PM1.50m | 6:04AM1.40m | 4:37PM1.51m | 6:55AM1.34m | 5:06PM1.51m | 7:53AM1.26m | 5:39PM1.47m | 9:06AM1.19m | 6:15PM1.39m | 10:45AM1.15m | 7:00PM1.28m | 12:14PM1.17m | 8:31PM1.14m | ||||||||
Low Tide | 10:39AM0.77m | 11:08PM-0.01m | 11:10AM0.86m | 11:48PM-0.03m | 11:41AM0.94m | 00:32AM0.01m | 12:13PM1.02m | 1:22AM0.10m | 12:49PM1.07m | 2:21AM0.22m | 1:52PM1.11m | 3:34AM0.34m | 4:41PM1.08m | ||||||||
 |  |  |  | |  | | | |  | | |  | |  | | | | |  | | |
 | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — |
 | — | 4:50 | — | — | 4:49 | — | — | 4:47 | — | — | 4:46 | — | — | 4:45 | — | — | 4:45 | — | — | 4:44 | — |
mm | 2 | — | 5 | — | — | 3 | 3 | 1 | 4 | 37 | 42 | 1 | — | — | — | — | 1 | 5 | — | 10 | — |
Temp °C | 19 | 20 | 19 | 18 | 18 | 15 | 18 | 19 | 19 | 17 | 18 | 19 | 20 | 20 | 19 | 16 | 19 | 21 | 22 | 17 | 17 |
Feels °C | 18 | 19 | 19 | 11 | 14 | 11 | 15 | 18 | 15 | 18 | 17 | 14 | 18 | 19 | 15 | 13 | 16 | 16 | 15 | 15 | 12 |
Swell 1 Height (m) Direction Period (s) | E 8 | ESE 7 | S 8 | S 8 | NE 8 | SE 11 | SE 10 | SE 13 | SE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 16 | SE 14 | SE 13 | SSE 14 | E 10 | SE 8 | SSW 8 | SSE 12 |
| kJ | 223 | 89 | 113 | 60 | 91 | 29 | 28 | 87 | 530 | 666 | 824 | 418 | 244 | 1519 | 902 | 600 | 845 | 46 | 268 | 476 | 308 |
Swell 2 Height (m) Direction Period (s) | S 7 | S 8 | NE 6 | SE 10 | S 7 | S 7 | SE 14 | SE 10 | SE 13 | SE 12 | SE 13 | SE 12 | SE 18 | SW 7 | SSE 18 | SSE 15 | ESE 10 | NNE 11 | SSE 11 | SSE 10 | SSW 8 |
| kJ | 51 | 100 | 30 | 48 | 27 | 9 | 74 | 27 | 100 | 75 | 57 | 92 | 726 | 37 | 534 | 559 | 75 | 12 | 416 | 342 | 107 |
Swell 3 Height (m) Direction Period (s) | SE 14 | SE 13 | SE 9 | ESE 10 | SE 10 | SE 16 | ENE 12 | E 14 | — | E 13 | NE 13 | SE 19 | SW 6 | S 7 | SW 8 | NE 8 | WSW 7 | NE 13 | S 13 | SSE 13 | SE 9 |
| kJ | 8 | 7 | 42 | 40 | 27 | 10 | 13 | 4 | — | 4 | 6 | 184 | 75 | 24 | 42 | 55 | 5 | 7 | 289 | 212 | 67 |
Wind waves Height (m) Direction Period (s) | NNW 3 | NE 6 | NE 6 | NE 7 | — | NE 8 | ENE 4 | ESE 5 | SSE 8 | SSE 8 | — | SW 7 | WSW 6 | — | NNE 4 | NE 8 | ENE 7 | SSE 12 | SSW 6 | SW 8 | NE 5 |
| kJ | 1 | 29 | 53 | 132 | — | 132 | 29 | 35 | 749 | 887 | — | 103 | 103 | — | 42 | 131 | 34 | 1407 | 229 | 1225 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 12 | 0 | 103 | 0 | 0 | 56 | 9 | 9 | 2 | 9 | 2 | 0 | 0 | 200 | 0 | 68 | 88 | 553 | 2 | 0 |
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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