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Surf Forecasts:

Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 2 am Wednesday 04 Feb 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
16.8° C
 (Which is normal 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 Thursday (Feb 05) at 12AM. The primary swell is predicted to be 1.3m and 6s period with a secondary swell of 0.7m and 6s. Another secondary swell of 0.4m 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 2.1m 8s and forecast to arrive on Saturday (Feb 07) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 8s period and expected on Sunday (Feb 08) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Thu 5th Feb)4.5ft (1.3m) 6s
Best Surf12AM (Thu 5th Feb)4.5ft (1.3m) 6s
Most Powerful12PM (Sat 7th Feb)7ft (2.1m) 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 Light rain (total 3mm), mostly falling on Fri night. Very mild (max 13°C on Fri afternoon, min 7°C on Fri night). Winds increasing (calm on Fri morning, fresh winds from the ENE by Fri night).

Days 3-6 Weather Summary Heavy rain (total 23mm), heaviest during Sat night. Later becoming colder with a dusting of snow on Sun night. Mild temperatures (max 7°C on Sun morning, min 1°C on Sun night). Winds decreasing (strong winds from the N on Sun night, light winds from the SW by Mon night).

Wednesday
04
Thursday
05
Friday
06
Saturday
07
Sunday
08
Monday
09
Tuesday
10
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
2
1
0
2
2
1
1
0
0
0
1
0
1
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.7
SW
0.9
SW
1.3
WSW
0.5
ENE
0.5
ENE
1.3
SW
1.7
SW
0.8
SSW
1.1
NE
1.6
ENE
1.3
ENE
0.4
ENE
1.7
ENE
1.8
NE
1.4
ENE
0.9
NE
0.4
NE
0.2
E
0.1
NE
0.1
NE
1.4
SW
Period(s) (?)566121267711871167887911116
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2350116858113630971283326145392232792679819655129
Wind
(km/h)
25
WSW
30
WSW
15
NW
5
NNW
10
WSW
10
W
5
NW
5
SSW
25
NE
30
NE
30
NE
20
E
10
W
35
WSW
35
N
30
NNW
20
W
10
SSW
10
NW
20
SW
20
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
off		cross-
off		cross-
on		cross-
off		cross-
off		glasscross-
off		cross-
off		cross-
off		crosscrosscrossoffoffcross-
off		oncross-
off		cross-
on		cross
High Tide
/ height (m)
5:40PM
1.46
6:49AM
1.37
6:23PM
1.38
7:07AM
1.37
7:05PM
1.28
7:25AM
1.37
7:49PM
1.16
7:44AM
1.36
8:40PM
1.04
8:04AM
1.34
9:59PM
0.94
8:26AM
1.30
Low Tide
/ height (m)
11:56AM
0.68
12:20AM
0.21
12:32PM
0.60
12:46AM
0.35
1:10PM
0.54
1:08AM
0.50
1:49PM
0.50
1:26AM
0.64
2:33PM
0.50
1:39AM
0.76
3:26PM
0.52
1:34AM
0.87
4:41PM
0.53
Wednesday
04
Thursday
05
Friday
06
Saturday
07
Sunday
08
Monday
09
Tuesday
10
Sunrise6:35--6:35--6:33--6:33--6:31--6:31--6:30--
Sunset-5:07--5:09--5:10--5:12--5:13--5:14--5:15-
clear
clear
part cloud
clear
cloud
part cloud
part cloud
part cloud
light rain
light rain
light rain
heavy rain
part cloud
light rain
snow showers
clear
clear
clear
clear
cloud
part cloud
Rain (mm)
--------35413-1-------
Temp. °C1112101112111213115457614678911
Feels °C (?)4558889106-3-30-3-4-10-612435
  • 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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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:
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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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