Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 2 pm Thursday 25 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
19.3° 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 Friday (Dec 26) at 12AM. The primary swell is predicted to be 2.1m and 9s period with a secondary swell of 0.8m and 14s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Onjuku in the next 12 days are 3.5m 10s and forecast to arrive on Friday (Dec 26) 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 1.2m 6s period and expected on Wednesday (Dec 31) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 26th Dec)7ft (2.1m) 9s
Best Surf 9AM (Fri 26th Dec)11ft (3.5m) 10s
Most Powerful 9AM (Fri 26th Dec)11ft (3.5m) 10s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 3mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu afternoon, min 3°C on Fri night). Winds decreasing (near gales from the WSW on Thu night, calm by Sat afternoon).

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Wed morning. Very mild (max 14°C on Mon afternoon, min 10°C on Sun afternoon). Winds increasing (calm on Sun night, strong winds from the WSW by Mon night).

Thu
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
1
4
!
0
2
2
2
2
2
1
1
0
0
0
0
1
0
0
0
1
2
Swell
Height Map
Wave Height (m) & direction (?)
2.2
S
2.1
S
3.5
SW
0.7
E
0.8
E
0.8
E
0.7
E
0.7
E
0.7
E
0.6
E
0.6
E
0.5
E
0.5
E
1.3
SW
1
SW
0.3
ENE
0.4
ENE
0.9
ESE
1.1
ESE
1.7
ENE
1.3
ENE
Period(s) (?)8910141414141314131312125615146776
Wave
Graph
(?)Metric surfscale
Energy kJ (?)654691200419124224617817317812312173728761446471105248132
Wind
(km/h)
15
WSW
5
N
40
WNW
25
NNW
20
N
15
N
5
E
10
NW
15
NNW
10
NE
5
ESE
5
SW
20
SW
40
WSW
30
WSW
5
NW
35
NE
30
NE
30
NNE
30
NNW
15
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
offcross-
off
cross-
off
offoffglasscross-
off
offcross-
off
glasscross-
on
cross-
on
cross-
on
crossglasscross-
off
cross-
off
cross-
off
offoff
High Tide
/ height (m)
6:49PM
1.26
8:56AM
1.30
7:45PM
1.16
9:30AM
1.30
9:03PM
1.05
10:07AM
1.31
10:56PM
0.99
10:48AM
1.31
1:13AM
1.03
11:34AM
1.33
2:56AM
1.14
12:26PM
1.36
4:02AM
1.25
Low Tide
/ height (m)
1:50AM
0.30
2:38PM
0.83
2:28AM
0.43
3:48PM
0.75
3:11AM
0.59
5:04PM
0.63
4:05AM
0.75
6:17PM
0.48
5:19AM
0.91
7:22PM
0.31
6:50AM
1.02
8:18PM
0.15
8:12AM
1.08
Thu
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Sunrise--6:43--6:45--6:45--6:46--6:46--6:46--6:46
Sunset4:30--4:31--4:32--4:32--4:34--4:35--4:35--
rain showers
part cloud
part cloud
part cloud
part cloud
cloud
cloud
clear
clear
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
cloud
light rain
cloud
part cloud
cloud
Rain (mm)
3----------------2---
Temp. °C17149955669101113141414131310101010
Feels °C (?)1511-11-213236899581173347
  • 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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