Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 2 am Wednesday 31 Dec 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
19.0° C
(Which is slightly warmer than usual)
Nearby Cam: 2km away, 部原ポイントサンセットライブカメラ(千葉県勝浦市部原海岸)


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 Wednesday (Dec 31) at 9AM. The primary swell is predicted to be 0.5m and 13s period with a secondary swell of 0.6m and 7s. 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 2.2m 8s and forecast to arrive on Monday (Jan 05) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Thursday (Jan 01) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Wed 31st Dec)1.5ft (0.5m) 13s
Best Surf12PM (Thu 1st Jan)5.5ft (1.7m) 7s
Most Powerful 3AM (Mon 5th Jan)7ft (2.2m) 8s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Moderate rain (total 11mm), heaviest on Thu night. Very mild (max 12°C on Wed afternoon, min 3°C on Fri night). Winds increasing (calm on Wed afternoon, fresh winds from the NNW by Fri night).

Days 3-6 Weather Summary Mostly dry. Very mild (max 11°C on Sun afternoon, min 5°C on Sat morning). Winds increasing (calm on Sat night, near gales from the WSW by Sun night).

Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Tuesday
06
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
1
1
1
2
2
1
0
0
0
0
1
0
0
0
0
0
1
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.5
E
0.5
E
0.5
E
0.6
E
0.8
ENE
1.1
ENE
0.7
ENE
0.6
ENE
0.5
ENE
0.4
ENE
0.4
ENE
0.3
ENE
0.9
SW
2
SW
2.3
SW
1
SSW
0.9
SSW
0.6
SSW
0.3
SW
0.1
NE
0.5
SW
Period(s) (?)131211141312121212121211788101098114
Wave
Graph
(?)Metric surfscale
Energy kJ (?)8778661422293391521177954452484494634192168541159
Wind
(km/h)
15
NNW
0
N
10
N
25
NNE
15
N
20
NNE
5
N
15
W
30
N
20
NW
10
W
5
NNW
35
WSW
50
WSW
50
W
25
WNW
20
NW
10
NNW
25
SE
25
SW
35
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
glassoffoffoffoffoffcrossoffcross-
off
crossglasscross-
on
cross-
on
crosscross-
off
cross-
off
cross-
off
cross-
on
cross-
on
cross
High Tide
/ height (m)
12:26PM
1.36
4:02AM
1.25
1:21PM
1.40
4:52AM
1.33
2:15PM
1.46
5:33AM
1.37
3:08PM
1.50
6:11AM
1.38
3:59PM
1.53
6:44AM
1.36
4:48PM
1.52
7:15AM
1.34
5:35PM
1.47
Low Tide
/ height (m)
8:18PM
0.15
8:12AM
1.08
9:10PM
0.02
9:13AM
1.09
9:59PM
-0.08
10:02AM
1.07
10:45PM
-0.12
10:45AM
1.03
11:28PM
-0.10
11:27AM
0.97
12:09AM
-0.03
12:09PM
0.90
12:46AM
0.09
Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Tuesday
06
Sunrise6:46--6:46--6:47--6:47--6:47--6:47--6:47--
Sunset-4:35--4:36--4:37--4:37--4:38--4:38--4:39-
part cloud
part cloud
part cloud
light rain
cloud
mod rain
part cloud
rain showers
rain showers
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
light rain
part cloud
rain showers
Rain (mm)
---1-7-12---------1-15
Temp. °C111211887874798101110776121112
Feels °C (?)910823342-4242-10-3001555
  • 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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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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