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Surf Forecasts:
Onjuku surfForecast / Chiba / Japan
12 Day Weather and Surf, issued 8 pm Tuesday 24 Feb 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 slightly cooler than normal)Best Forecast Surf Conditions for Onjuku this week:
The surf forecast for Onjuku over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Feb 27) at 3AM. The primary swell is predicted to be 3.5m and 10s period with a secondary swell of 3.0m and 10s. Another secondary swell of 0.9m 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 12 days are 3.5m 10s and forecast to arrive on Friday (Feb 27) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Wednesday (Feb 25) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 27th Feb) | 11ft (3.5m) 10s |
| Best Surf | 3AM (Fri 27th Feb) | 11ft (3.5m) 10s |
| Most Powerful | 3AM (Fri 27th Feb) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Onjuku over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Heavy rain (total 61mm), heaviest during Wed afternoon. Very mild (max 17°C on Tue night, min 8°C on Thu morning). Winds decreasing (near gales from the N on Thu morning, calm by Fri afternoon). | Days 3-6 Weather Summary Some drizzle, heaviest during Sun night. Very mild (max 16°C on Sat afternoon, min 9°C on Sat night). Wind will be generally light. | |||||||||||||||||||||
Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | Sunday 01 | Monday 02 | Tue 03 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 10 | 6 | 8 | 8 | 9 | 10 | 9 | 9 | 9 | 9 | 10 | 12 | 10 | 10 | 11 | 9 | 16 | 14 | 13 | 13 | 13 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 51 | 263 | 437 | 1108 | 1452 | 1874 | 1462 | 1473 | 866 | 450 | 496 | 902 | 394 | 231 | 150 | 95 | 324 | 336 | 312 | 372 | 367 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | on | cross- off | off | off | off | off | off | off | cross- on | off | cross- off | off | cross- off | on | on | off | cross- off | off | off | cross- off | |
High Tide / height (m) | 11:02PM 0.99 | 8:13AM 1.36 | 8:56AM 1.30 | 4:36AM 11:04AM 1.21 1.23 | 4:17AM 1.26 | 1:18PM 1.27 | 4:29AM 1.30 | 2:35PM 1.35 | 4:45AM 1.33 | 3:30PM 1.42 | 5:02AM 1.36 | 4:17PM 1.46 | ||||||||||
Low Tide / height (m) | 1:25AM 0.97 | 4:56PM 0.38 | 6:47PM 0.34 | 7:18AM 1.19 | 8:08PM 0.25 | 8:48AM 1.09 | 9:04PM 0.18 | 9:26AM 0.96 | 9:47PM 0.14 | 9:59AM 0.82 | 10:22PM 0.16 | 10:31AM 0.67 | ||||||||||
Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | Sunday 01 | Monday 02 | Tue 03 | ||||||||||||||||
| Sunrise | - | 6:13 | - | - | 6:13 | - | - | 6:11 | - | - | 6:09 | - | - | 6:09 | - | - | 6:07 | - | - | 6:05 | - | |
| Sunset | - | - | 5:29 | - | - | 5:30 | - | - | 5:30 | - | - | 5:31 | - | - | 5:32 | - | - | 5:34 | - | - | 5:34 | |
 |  |  |  |  | |  | | |  |  |  |  | | | | | | | | | ||
Rain (mm) | 4 | 10 | 29 | 18 | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | 3 | - | - | |
| Temp. °C | 17 | 17 | 11 | 10 | 9 | 9 | 9 | 11 | 12 | 13 | 15 | 16 | 13 | 12 | 13 | 14 | 13 | 12 | 12 | 12 | 13 | |
| Feels °C (?) | 13 | 12 | 3 | 2 | -1 | -1 | 0 | 6 | 9 | 11 | 10 | 11 | 9 | 9 | 10 | 11 | 11 | 7 | 7 | 7 | 9 | |
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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 12 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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