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Surf Forecasts:

Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 2 pm Thursday 20 Nov 2025 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
19.5° C
 (Which is 1.6°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 (Nov 21) at 6AM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 0.6m and 6s. Another secondary swell of 0.5m and 6s 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 3.0m 10s and forecast to arrive on Wednesday (Nov 26) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 10s period and expected on Wednesday (Nov 26) at 3PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Fri 21st Nov)3.5ft (1.1m) 6s
Best Surf 9AM (Mon 24th Nov)6.5ft (2.0m) 8s
Most Powerful12PM (Wed 26th Nov)10ft (3.0m) 10s

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 Some drizzle, heaviest during Sun morning. Very mild (max 17°C on Sun morning, min 11°C on Thu night). Winds increasing (calm on Thu afternoon, fresh winds from the NNW by Fri night).

Days 3-6 Weather Summary Heavy rain (total 36mm), heaviest during Sun night. Very mild (max 18°C on Sun night, min 12°C on Tue night). Winds increasing (calm on Tue morning, near gales from the WSW by Tue night).

Thu
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
1
0
1
0
0
1
1
0
0
0
0
2
2
2
2
0
0
0
0
0
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.8
ESE
0.7
ESE
0.6
SSW
0.7
SW
0.9
SSW
0.8
NE
0.9
NE
0.4
ESE
0.4
ESE
0.4
ESE
2.4
SE
2
SE
1.6
SE
1.4
SE
1.2
SE
1.2
SE
1.8
SSW
1.9
SW
1.3
SSW
0.7
SW
0.4
SE
Period(s) (?)6667856991078888971010109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)4139264911231683332365824803242662012163156783149821
Wind
(km/h)
5
SSW
20
WSW
5
WNW
15
WSW
15
NW
15
NNE
15
ENE
15
SE
15
S
15
S
20
SSE
10
NE
15
N
15
NNW
5
SE
20
SW
45
WSW
45
WSW
40
W
45
NNW
20
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glasscross-
on		cross-
off		crosscross-
off		cross-
off		cross-
off		cross-
on		onononcross-
off		offcross-
off		glasscross-
on		cross-
on		crosscrosscross-
off		off
High Tide
/ height (m)
3:22PM
1.41
5:33AM
1.32
3:49PM
1.42
6:09AM
1.30
4:17PM
1.43
6:47AM
1.27
4:47PM
1.42
7:28AM
1.24
5:18PM
1.38
8:14AM
1.21
5:52PM
1.33
9:06AM
1.19
6:33PM
1.25
10:03AM
1.20
Low Tide
/ height (m)
10:30PM
0.10
10:29AM
0.91
11:02PM
0.08
10:57AM
0.94
11:36PM
0.10
11:26AM
0.96
12:12AM
0.13
11:58AM
0.98
12:50AM
0.19
12:38PM
1.00
1:31AM
0.25
1:35PM
1.02
2:17AM
0.33
Thu
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Sunrise--6:18--6:18--6:20--6:20--6:22--6:22--6:22
Sunset4:30--4:29--4:29--4:28--4:28--4:28--4:27--
clear
clear
part cloud
clear
clear
clear
part cloud
cloud
rain showers
light rain
heavy rain
rain showers
part cloud
part cloud
part cloud
rain showers
rain showers
clear
clear
clear
clear
Rain (mm)
--------131911---21----
Temp. °C131414151414141617171817161517161714151415
Feels °C (?)111011111011101314141417151314111047511
  • 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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Latest Updates

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Quiksilver Teams Up With PrimaLoft® For World’s First Thermal Layering System for a Wetsuit.

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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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