Surf Forecasts:
Onjuku surf forecast from 17 Jun 2026:
- Best quality surf: Wednesday 24 Jun, 9PM (local time) - 6ft (1.9m), 10s period, ENE swell with offshore winds.
- Most powerful swell: Wednesday 24 Jun, 9AM (local time) - 10ft (3.0m), 10s period, NE swell with 1,676 kJ wave energy.
- Next surfable swell (1★+): Thursday 18 Jun, 6AM (local time) - 4.5ft (1.4m), 6s period with SW 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 Thursday (Jun 18) at 6AM. The primary swell is predicted to be 1.4m and 6s period with a secondary swell of 0.9m and 6s. Another secondary swell of 0.8m 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 3.0m 10s and forecast to arrive on Wednesday (Jun 24) at 9AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Tuesday (Jun 23) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 18th Jun) | 4.5ft (1.4m) 6s |
| Best Surf | 9PM (Wed 24th Jun) | 6ft (1.9m) 10s |
| Most Powerful | 9AM (Wed 24th Jun) | 10ft (3.0m) 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 61mm), heaviest during Wed night. Warm (max 23°C on Fri morning, min 20°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 34mm), heaviest during Sat night. Warm (max 23°C on Tue morning, min 19°C on Tue afternoon). Winds decreasing (fresh winds from the E on Sat night, calm by Mon night). | ||||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wed 24 | |||||||||||||||
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) | ENE 9 | S 7 | S 7 | S 8 | E 9 | E 9 | E 8 | ENE 8 | ENE 9 | ENE 10 | ESE 7 | E 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 8 | E 9 | NE 9 | NE 10 | ENE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 144 | 226 | 358 | 146 | 73 | 76 | 51 | 57 | 103 | 197 | 471 | 784 | 520 | 449 | 498 | 509 | 298 | 286 | 1208 | 1676 | 874 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | off | glassy | cross-off | cross | cross-off | cross | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | glassy | cross-off | off | off | off |
High Tide | 5:16AM1.49m | 8:07PM1.30m | 6:07AM1.42m | 8:44PM1.27m | 7:04AM1.31m | 9:18PM1.26m | 8:09AM1.17m | 9:51PM1.26m | 9:32AM1.05m | 10:24PM1.27m | 11:22AM0.98m | 11:00PM1.28m | 1:23PM1.00m | ||||||||
Low Tide | 00:00AM1.02m | 12:47PM-0.00m | 00:50AM0.97m | 1:31PM0.13m | 1:47AM0.91m | 2:13PM0.30m | 2:53AM0.84m | 2:54PM0.47m | 4:07AM0.74m | 3:34PM0.64m | 5:22AM0.64m | 4:19PM0.78m | 6:30AM0.53m | 5:17PM0.90m | |||||||
 |  |  |  | | | |  |  | | | |  | | |  |  | | | | | |
 | — | 4:22 | — | — | 4:22 | — | — | 4:24 | — | — | 4:24 | — | — | 4:24 | — | — | 4:24 | — | — | 4:24 | — |
 | 6:54 | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:55 | — | — | 6:55 | — | — | 6:55 | — | — | 6:55 |
mm | 41 | 15 | — | — | — | — | — | — | 5 | 14 | 3 | 3 | 4 | 2 | 2 | 1 | 3 | 2 | 2 | 1 | — |
Temp °C | 21 | 21 | 22 | 21 | 23 | 23 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 23 | 23 | 18 | 17 | 18 |
Feels °C | 21 | 23 | 20 | 23 | 24 | 24 | 23 | 22 | 22 | 20 | 17 | 19 | 19 | 19 | 19 | 20 | 25 | 22 | 14 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | S 7 | S 7 | S 8 | S 7 | E 9 | E 8 | ENE 8 | ENE 9 | ENE 10 | SSW 8 | SW 8 | E 10 | ENE 10 | ENE 10 | ESE 8 | E 8 | E 9 | SE 11 | ENE 10 | SSE 10 |
| kJ | 144 | 110 | 358 | 146 | 43 | 76 | 51 | 57 | 103 | 197 | 11 | 15 | 196 | 139 | 131 | 509 | 298 | 286 | 30 | 1086 | 42 |
Swell 2 Height (m) Direction Period (s) | SSE 10 | ENE 9 | E 9 | SE 6 | E 9 | S 6 | SSW 7 | S 8 | SE 10 | SE 9 | SSE 11 | SE 9 | SSW 7 | SSW 8 | SE 10 | ENE 10 | ENE 10 | S 7 | SSW 6 | SSE 11 | SW 7 |
| kJ | 10 | 115 | 83 | 40 | 73 | 26 | 20 | 30 | 24 | 22 | 13 | 21 | 16 | 6 | 28 | 83 | 71 | 33 | 4 | 45 | 2 |
Swell 3 Height (m) Direction Period (s) | SE 16 | ESE 6 | SE 9 | E 9 | SE 10 | SE 10 | SE 5 | SE 10 | S 5 | SSE 12 | E 18 | E 18 | — | SSE 10 | SSW 8 | SE 11 | SE 11 | SE 11 | — | — | — |
| kJ | 10 | 17 | 65 | 63 | 25 | 25 | 7 | 24 | 2 | 14 | 6 | 6 | — | 10 | 6 | 29 | 31 | 31 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 4 | S 7 | — | N 4 | NE 5 | NE 4 | ENE 3 | ENE 4 | E 4 | SE 5 | ESE 7 | E 8 | ESE 8 | ESE 8 | ESE 8 | — | — | NE 5 | NE 9 | NE 10 | ENE 10 |
| kJ | 22 | 226 | — | 12 | 5 | 4 | 1 | 16 | 26 | 82 | 471 | 784 | 520 | 449 | 498 | — | — | 36 | 1208 | 1676 | 874 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 0 | 82 | 0 | 51 | 9 | 56 | 240 | 60 | 132 | 206 | 206 | 110 | 110 | 51 | 51 | 0 | 2 | 142 | 142 | 16 |
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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