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Surf Forecasts:
Onjuku surfForecast / Chiba / Japan
48hr Weather and Surf, issued 2 am Thursday 16 Apr 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
15.6° C
(Which is 2.5°C colder than average for this time of year)How big are the waves at Onjuku today?
The current surf forecast for Onjuku at 10AM is: 1.7m 16s primary swell from a South-southeast direction and 1.0m 7s secondary swell from a Southeast direction (forecast issued at 02:00am April 16). An open ocean swell of 1.4m 5s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Apr) | 5.5ft (1.7m) | 16s |
| Afternoon (16 Apr) | 5.5ft (1.7m) | 16s |
| Evening (16 Apr) | 11ft (3.5m) | 9s |
Table - waves today at Onjuku. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 16 | Friday 17 | Saturday 18 | ||||||||||||||||||||||
| 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 15 | 14 | 14 | 16 | 16 | 16 | 8 | 9 | 15 | 15 | 15 | 15 | 14 | 10 | 14 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1102 | 1175 | 874 | 1469 | 1433 | 1379 | 1371 | 1634 | 1139 | 1139 | 1110 | 1052 | 1204 | 1061 | 712 | 1739 | 2021 | 2219 | 2219 | 2191 | 2164 | 2109 | 2082 | 2184 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross- on | cross- on | glass | cross- on | on | on | on | glass |
High Tide / height (m) | 3:29AM 1.40 | 4:03PM 1.39 | 3:50AM 1.44 | 4:50PM 1.44 | 4:13AM 1.48 | 5:37PM 1.44 | ||||||||||||||||||
Low Tide / height (m) | 9:19PM 0.47 | 9:46AM 0.36 | 9:55PM 0.53 | 10:19AM 0.20 | 10:30PM 0.63 | 10:54AM 0.07 | ||||||||||||||||||
Thursday 16 | Friday 17 | Saturday 18 | ||||||||||||||||||||||
| Sunrise | - | - | 5:05 | - | - | - | - | - | - | - | 5:05 | - | - | - | - | - | - | - | 5:03 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:10 | - | - | - | - | - | - | - | 6:12 | - | - | - | - | - | - | - | 6:12 | - |
 |  |  |  |  | | |  | |  |  | | | | | | | |  | | | | | | |
Rain (mm) | 11 | 5 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 16 | 15 | 15 | 15 | 16 | 14 | 13 | 11 | 10 | 10 | 10 | 11 | 12 | 12 | 13 | 13 | 14 | 14 | 14 | 16 | 16 | 17 | 16 | 16 |
| Feels °C (?) | 17 | 11 | 11 | 8 | 8 | 6 | 3 | 1 | 0 | 2 | 4 | 5 | 6 | 7 | 10 | 10 | 12 | 12 | 14 | 15 | 14 | 15 | 15 | 16 |
- 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.
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