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Surf Forecasts:
Onjuku surfForecast / Chiba / Japan
16 Day Weather and Surf, issued 8 am Saturday 28 Mar 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
15.4° C
(Which is 1.7°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 Sunday (Mar 29) at 9AM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.5m and 4s is also forecast. 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 3.5m 9s and forecast to arrive on Tuesday (Mar 31) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Thursday (Apr 02) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sun 29th Mar) | 3.5ft (1.1m) 10s |
| Best Surf | 3AM (Wed 1st Apr) | 7.5ft (2.3m) 10s |
| Most Powerful | 9PM (Tue 31st Mar) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Onjuku over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Some drizzle, heaviest during Sat morning. Very mild (max 17°C on Sun morning, min 13°C on Sat morning). Winds increasing (calm on Sun night, fresh winds from the SSW by Mon night). | Days 3-6 Weather Summary Heavy rain (total 54mm), heaviest during Tue night. Very mild (max 17°C on Tue morning, min 9°C on Thu afternoon). Winds decreasing (strong winds from the NNE on Thu morning, calm by Thu night). | ||||||||||||||||||||
Saturday 28 | Sunday 29 | Monday 30 | Tuesday 31 | Wednesday 01 | Thursday 02 | Friday 03 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 9 | 10 | 9 | 9 | 10 | 9 | 10 | 6 | 7 | 10 | 9 | 8 | 8 | 7 | 7 | 8 | 9 | 9 | 9 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 333 | 293 | 207 | 225 | 211 | 164 | 148 | 147 | 90 | 106 | 327 | 1448 | 541 | 240 | 120 | 458 | 429 | 512 | 381 | 306 | 166 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | on | on | cross- off | cross- on | glass | cross- on | cross- on | cross- on | on | on | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | cross | cross- on | cross- on |
High Tide / height (m) | 11:38AM 1.14 | 3:20AM 1.25 | 1:37PM 1.20 | 3:34AM 1.29 | 2:44PM 1.28 | 3:49AM 1.32 | 3:34PM 1.35 | 4:05AM 1.36 | 4:18PM 1.40 | 4:22AM 1.39 | 4:57PM 1.41 | 4:39AM 1.42 | 5:34PM 1.39 | ||||||||
Low Tide / height (m) | 7:46PM 0.36 | 8:39AM 0.93 | 8:39PM 0.34 | 9:10AM 0.76 | 9:19PM 0.36 | 9:40AM 0.60 | 9:52PM 0.40 | 10:09AM 0.45 | 10:22PM 0.47 | 10:38AM 0.33 | 10:48PM 0.55 | 11:06AM 0.24 | 11:13PM 0.64 | ||||||||
Saturday 28 | Sunday 29 | Monday 30 | Tuesday 31 | Wednesday 01 | Thursday 02 | Friday 03 | |||||||||||||||
| Sunrise | 5:31 | - | - | 5:31 | - | - | 5:28 | - | - | 5:28 | - | - | 5:26 | - | - | 5:24 | - | - | 5:24 | - | - |
| Sunset | - | 5:54 | - | - | 5:55 | - | - | 5:57 | - | - | 5:58 | - | - | 5:59 | - | - | 5:59 | - | - | 6:00 | - |
 |  |  | |  |  | | | |  |  |  | |  |  | | | | | |  | |
Rain (mm) | 1 | - | - | - | - | - | - | - | - | 2 | 11 | 15 | - | - | 12 | 13 | 1 | - | - | - | - |
| Temp. °C | 14 | 15 | 15 | 17 | 17 | 15 | 17 | 17 | 17 | 17 | 15 | 17 | 15 | 14 | 15 | 11 | 9 | 9 | 14 | 14 | 16 |
| Feels °C (?) | 12 | 14 | 13 | 16 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 10 | 10 | 9 | 12 | 1 | 1 | 3 | 11 | 8 | 12 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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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