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Surf Forecasts:

Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 8 am Thursday 15 Jan 2026 JST
Forecast 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
16.4° C
 (Which is 1.2°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 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Jan 16) at 9AM. The primary swell is predicted to be 2.4m and 8s period with a secondary swell of 1.4m and 8s. Another secondary swell of 0.2m and 13s 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 12 days are 2.4m 8s and forecast to arrive on Friday (Jan 16) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 7s period and expected on Saturday (Jan 17) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Fri 16th Jan)8ft (2.4m) 8s
Best Surf 9AM (Fri 16th Jan)8ft (2.4m) 8s
Most Powerful 9AM (Fri 16th Jan)8ft (2.4m) 8s

Table - best surf conditions forecast for Onjuku over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 15°C on Fri afternoon, min 8°C on Thu morning). Winds decreasing (strong winds from the WSW on Thu night, calm by Fri night).

Days 3-6 Weather Summary Moderate rain (total 12mm), heaviest on Tue night. Very mild (max 11°C on Mon night, min 3°C on Tue night). Winds increasing (light winds from the NW on Mon night, fresh winds from the NNE by Tue night).

Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
3
1
0
1
1
1
1
0
0
0
0
2
2
2
0
2
1
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.3
SE
0.4
SW
1.9
SW
2.4
SW
0.8
SSW
0.3
ENE
0.3
ENE
1.7
SW
0.7
SW
1.1
NE
0.7
NE
0.3
ENE
0.3
ENE
0.4
ENE
1.4
ESE
0.9
ENE
0.8
ENE
0.6
ENE
1.4
NE
0.4
ENE
0.4
ENE
Period(s) (?)9878812127778121111711111181312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)13153616757630282534913267272447175183143932355750
Wind
(km/h)
5
NE
20
SW
45
WSW
15
NW
10
NE
5
ESE
15
WNW
10
W
15
N
20
NE
20
ENE
20
NE
20
NE
20
NE
10
NW
15
NW
10
NNE
30
NNE
20
N
10
N
10
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
on		cross-
on		cross-
off		cross-
off		crosscross-
off		crossoffcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		offoffcross-
off
High Tide
/ height (m)
12:54PM
1.27
4:49AM
1.21
1:55PM
1.31
5:12AM
1.26
2:46PM
1.36
5:35AM
1.29
3:30PM
1.41
5:59AM
1.32
4:11PM
1.45
6:22AM
1.34
4:50PM
1.46
6:45AM
1.36
5:30PM
1.44
Low Tide
/ height (m)
9:00PM
0.26
8:57AM
1.07
9:41PM
0.18
9:41AM
1.03
10:17PM
0.11
10:17AM
0.98
10:51PM
0.07
10:50AM
0.93
11:23PM
0.06
11:24AM
0.87
11:53PM
0.08
12:00PM
0.80
12:23AM
0.14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Sunrise6:46--6:46--6:46--6:45--6:45--6:45--6:43--
Sunset-4:47--4:49--4:50--4:51--4:52--4:52--4:53-
cloud
cloud
clear
clear
clear
part cloud
clear
clear
clear
cloud
cloud
cloud
light rain
light rain
rain showers
part cloud
part cloud
mod rain
light snow
snow showers
part cloud
Rain (mm)
------------122--7-1-
Temp. °C10121414151314141299991011111110223
Feels °C (?)83510111010108442467776-3-3-1
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

View detailed surf forecast for Onjuku at:
surf-forecast.com

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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