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Surf Forecasts:
Onjuku surfForecast / Chiba / Japan
16 Day Weather and Surf, issued 8 am Friday 15 May 2026 JSTForecast update in hr min s Forecast update imminent
Onjuku surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Onjuku sea temperature is
17.5° C
(Which is 2.8°C colder than average for this time of year)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 Friday (May 15) at 9PM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.3m and 7s. 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 1.4m 9s and forecast to arrive on Sunday (May 17) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 7s period and expected on Friday (May 15) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 15th May) | 3.5ft (1.1m) 9s |
| Best Surf | 9PM (Fri 15th May) | 3.5ft (1.1m) 9s |
| Most Powerful | 6PM (Sun 17th May) | 4.5ft (1.4m) 9s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 22°C on Sun morning, min 16°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Wed afternoon. Warm (max 22°C on Mon morning, min 16°C on Wed afternoon). Winds increasing (light winds from the SE on Mon morning, fresh winds from the NE by Wed afternoon). | ||||||||||||||||||||
Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
ESE 9 | E 9 | E 9 | E 9 | SE 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | SE 10 | ESE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | ESE 9 | SSW 7 | |
254 | 246 | 199 | 117 | 81 | 78 | 172 | 292 | 286 | 207 | 151 | 90 | 77 | 122 | 142 | 160 | 170 | 144 | 128 | 113 | 186 | |
Wind (km/h) | |||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross | cross-off | glassy | cross | glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | off | |
High Tide | 4:03PM1.35m | 2:55AM1.45m | 4:55PM1.40m | 3:25AM1.49m | 5:46PM1.41m | 3:58AM1.52m | 6:39PM1.38m | 4:34AM1.53m | 7:33PM1.33m | 5:13AM1.51m | 8:30PM1.27m | 5:56AM1.44m | 9:31PM1.22m | ||||||||
Low Tide | 9:17AM0.19m | 9:21PM0.79m | 9:56AM0.04m | 10:02PM0.87m | 10:37AM-0.07m | 10:41PM0.95m | 11:20AM-0.11m | 11:18PM1.01m | 12:06PM-0.09m | 11:56PM1.05m | 12:54PM-0.01m | 00:40AM1.07m | 1:46PM0.11m | 1:39AM1.06m | |||||||
 |  |  | | |  | | | | | | | | | |  | |  | | |  | |
 | 4:35 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:31 | — | — | 4:31 | — | — | 4:31 | — | — |
 | — | 6:34 | — | — | 6:35 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:38 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 2 | 5 | 2 | 8 | |
Temp °C | 17 | 17 | 17 | 19 | 20 | 18 | 22 | 21 | 22 | 22 | 22 | 20 | 22 | 21 | 20 | 21 | 17 | 16 | 19 | 18 | 18 |
14 | 14 | 16 | 17 | 18 | 18 | 20 | 20 | 20 | 20 | 19 | 18 | 19 | 18 | 19 | 23 | 12 | 11 | 16 | 16 | 17 | |
Swell 1 Height (m) Direction Period (s) | ESE 9 | E 9 | E 9 | E 9 | SE 9 | SE 6 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | E 8 | ESE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | ESE 9 | S 7 |
 kJ | 254 | 246 | 199 | 117 | 81 | 42 | 172 | 292 | 286 | 207 | 151 | 90 | 44 | 122 | 142 | 160 | 170 | 144 | 128 | 113 | 128 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 7 | NE 7 | SE 9 | E 8 | E 9 | SE 10 | NE 9 | NE 10 | ENE 10 | SSE 8 | SE 9 | SE 10 | NE 9 | NE 8 | SSW 4 | NE 9 | NE 7 | NE 6 | S 8 | SE 9 |
| kJ | 3 | 17 | 7 | 41 | 71 | 78 | 38 | 31 | 26 | 10 | 22 | 31 | 77 | 12 | 18 | 7 | 12 | 16 | 12 | 1 | 86 |
Swell 3 Height (m) Direction Period (s) | SE 12 | NE 9 | SE 11 | SE 11 | NE 8 | SE 11 | NE 9 | ENE 9 | NE 9 | NE 10 | SE 10 | SSE 7 | NE 9 | E 11 | NE 9 | SSE 5 | SSW 4 | S 8 | S 8 | E 11 | ENE 6 |
| kJ | 6 | 3 | 19 | 20 | 9 | 29 | 27 | 16 | 12 | 33 | 16 | 9 | 13 | 2 | 26 | 5 | 6 | 1 | 1 | 2 | 13 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 7 | — | NNE 6 | — | — | — | — | — | — | — | SSW 4 | SW 4 | SSW 5 | SSW 4 | SW 4 | NE 3 | — | SSE 3 | SE 5 | SSW 7 |
| kJ | 24 | 49 | — | 4 | — | — | — | — | — | — | — | 5 | 21 | 40 | 29 | 21 | 3 | — | 2 | 45 | 186 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 56 | 57 | 0 | 0 | 51 | 0 | 0 | 240 | 0 | 9 | 9 | 142 | 142 | 143 | 23 | 9 | 206 | 206 | 110 | 56 | 0 |
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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