Surf Forecasts:
Onjuku surf forecast from 26 Jun 2026:
- Best quality surf: Sunday 28 Jun, 6AM (local time) - 8ft (2.4m), 11s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 28 Jun, 12AM (local time) - 13ft (4.0m), 10s period, SSW swell with 2,867 kJ wave energy.
- Next surfable swell (1★+): Sunday 28 Jun, 6AM (local time) - 8ft (2.4m), 11s 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 Sunday (Jun 28) at 6AM. The primary swell is predicted to be 2.4m and 11s period. 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 4.0m 10s and forecast to arrive on Sunday (Jun 28) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Monday (Jun 29) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sun 28th Jun) | 8ft (2.4m) 11s |
| Best Surf | 6AM (Sun 28th Jun) | 8ft (2.4m) 11s |
| Most Powerful | 12AM (Sun 28th Jun) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 186mm), heaviest during Sat afternoon. Warm (max 25°C on Fri night, min 21°C on Sun morning). Winds decreasing (near gales from the SSW on Fri night, light winds from the ENE by Sat night). | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Wed morning. Warm (max 23°C on Tue morning, min 21°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 27 | Sunday 28 | Monday 29 | Tuesday 30 | Wednesday 1 | Thursday 2 | Fri 3 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | S 6 | SSW 9 | S 9 | SSW 10 | S 10 | S 9 | SSE 8 | SSE 7 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 5 | SSW 8 | E 6 | SE 8 | ESE 8 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 94 | 1716 | 548 | 2867 | 832 | 436 | 235 | 49 | 51 | 65 | 65 | 67 | 81 | 79 | 73 | 85 | 36 | 34 | 137 | 129 | 89 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | glassy | cross | off | cross-off | cross-off | cross-off | cross | cross-on |
High Tide | 1:08AM1.31m | 4:31PM1.20m | 1:54AM1.33m | 5:05PM1.24m | 2:39AM1.36m | 5:36PM1.26m | 3:21AM1.39m | 6:06PM1.28m | 4:01AM1.41m | 6:35PM1.28m | 4:41AM1.41m | 7:04PM1.29m | 5:20AM1.39m | ||||||||
Low Tide | 8:56AM0.25m | 8:43PM1.03m | 9:35AM0.19m | 9:29PM1.02m | 10:13AM0.14m | 10:09PM1.00m | 10:50AM0.11m | 10:45PM0.98m | 11:25AM0.10m | 11:21PM0.95m | 11:58AM0.12m | 11:58PM0.91m | 12:30PM0.16m | ||||||||
 |  |  |  | | |  |  | |  |  | |  | | | | | |  | | | |
 | — | 4:24 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:28 | — |
 | 6:55 | — | 6:57 | — | — | 6:57 | — | — | 6:57 | — | — | 6:57 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 |
mm | 48 | 5 | 75 | 53 | 3 | 1 | 1 | — | — | — | — | — | 3 | 14 | 4 | 1 | — | — | — | — | — |
Temp °C | 25 | 23 | 23 | 25 | 22 | 22 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 22 | 22 | 21 | 23 | 23 | 22 | 24 | 24 |
Feels °C | 24 | 24 | 22 | 22 | 21 | 23 | 24 | 23 | 23 | 24 | 24 | 24 | 24 | 25 | 23 | 19 | 23 | 23 | 24 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | S 8 | ESE 9 | S 10 | S 10 | S 9 | SSE 8 | SSE 7 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 5 | SSW 8 | E 6 | E 6 | E 8 | SE 6 | SE 6 |
| kJ | 71 | 887 | 15 | 1702 | 832 | 436 | 235 | 49 | 51 | 65 | 65 | 67 | 81 | 79 | 73 | 85 | 36 | 26 | 80 | 23 | 56 |
Swell 2 Height (m) Direction Period (s) | NE 10 | SW 13 | ESE 16 | SSW 12 | NE 5 | NE 6 | NE 6 | SSW 8 | S 7 | E 5 | E 5 | E 4 | E 4 | NE 10 | SE 9 | ESE 6 | SE 8 | SE 8 | S 5 | SSE 6 | NE 11 |
| kJ | 25 | 45 | 25 | 49 | 7 | 12 | 14 | 38 | 23 | 17 | 7 | 3 | 3 | 27 | 65 | 50 | 34 | 34 | 14 | 10 | 31 |
Swell 3 Height (m) Direction Period (s) | SE 10 | ESE 8 | ENE 9 | E 9 | E 8 | ESE 15 | ESE 15 | SE 9 | SW 8 | SW 8 | SW 7 | ESE 13 | ESE 13 | ESE 13 | NE 10 | SE 9 | S 6 | S 6 | NE 9 | NE 9 | ESE 12 |
| kJ | 37 | 14 | 8 | 6 | 6 | 21 | 42 | 40 | 17 | 16 | 9 | 18 | 17 | 17 | 25 | 37 | 18 | 18 | 23 | 13 | 14 |
Wind waves Height (m) Direction Period (s) | S 6 | SSW 9 | S 9 | SSW 10 | — | — | NE 6 | NE 4 | ENE 4 | — | E 5 | — | — | SSE 3 | — | — | E 6 | — | ESE 8 | E 8 | E 8 |
| kJ | 94 | 1716 | 548 | 2867 | — | — | 30 | 18 | 25 | — | 11 | — | — | 1 | — | — | 46 | — | 137 | 129 | 89 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 86 | 18 | 88 | 18 | 73 | 17 | 0 | 16 | 51 | 0 | 0 | 9 | 0 | 0 | 9 | 73 | 12 | 56 | 0 | 51 | 9 |
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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