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Surf Forecasts:

Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 2 am Wednesday 11 Mar 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
15.5° C
 (Which is 1.1°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 Wednesday (Mar 11) at 12PM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.9m and 10s. 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 16s and forecast to arrive on Monday (Mar 16) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Saturday (Mar 14) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Wed 11th Mar)3ft (0.9m) 10s
Best Surf 9PM (Sun 15th Mar)7.5ft (2.3m) 16s
Most Powerful12AM (Mon 16th Mar)8ft (2.4m) 16s

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

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

Short Range Forecast Some drizzle, heaviest during Fri night. Mild temperatures (max 9°C on Thu afternoon, min 6°C on Wed morning). Winds increasing (light winds from the ENE on Wed afternoon, strong winds from the NNE by Fri night).

Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Mon night. Very mild (max 12°C on Mon morning, min 9°C on Sat morning). Winds decreasing (fresh winds from the NNE on Sat morning, calm by Mon morning).

Wednesday
11
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
3
2
3
3
3
4
2
1
1
2
3
4
3
5
5
3
2
3
2
3
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.3
ENE
1.3
ENE
1.4
ENE
1.6
ENE
1.7
ENE
1.7
ENE
1.8
ENE
1.8
E
1.8
E
1.8
E
1.7
E
1.7
E
1.9
E
1.9
E
2.4
E
2.5
E
2.2
ESE
1.6
E
1.9
E
1.8
E
1.5
E
Period(s) (?)81013131214161717171616171616141415131313
Wave
Graph
(?)Metric surfscale
Energy kJ (?)217328679888934110616221932181517721545145621671909276825781690108711911060734
Wind
(km/h)
20
NNE
10
ENE
15
NE
20
NNE
15
ENE
20
NE
25
NNE
30
NE
35
NE
35
NNE
30
NE
20
NE
15
NNE
15
E
10
ENE
5
ESE
5
ESE
15
ESE
15
NE
25
NNE
15
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		offcross-
off		cross-
off		offcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		offcrosscross-
off		glasscross-
on		cross-
on		cross-
off		cross-
off		off
High Tide
/ height (m)
7:42AM
1.25
8:00AM
1.17
4:01AM 11:51AM
1.17 1.12
3:50AM
1.22
1:37PM
1.19
3:59AM
1.28
2:37PM
1.28
4:13AM
1.34
3:24PM
1.36
Low Tide
/ height (m)
3:31PM
0.49
5:16PM
0.52
7:07PM
0.48
8:32AM
1.08
8:10PM
0.39
8:54AM
0.98
8:52PM
0.32
9:20AM
0.86
9:27PM
0.27
9:47AM
0.72
9:59PM
0.26
Wednesday
11
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Sunrise5:56--5:54--5:52--5:52--5:50--5:48--5:47--
Sunset-5:40--5:42--5:43--5:44--5:45--5:45--5:45-
part cloud
cloud
cloud
cloud
part cloud
clear
cloud
cloud
light rain
part cloud
clear
part cloud
part cloud
part cloud
part cloud
cloud
light rain
rain showers
light rain
rain showers
cloud
Rain (mm)
--------1-------1431-
Temp. °C77789989910109111111121011101010
Feels °C (?)2323431112237781087746
  • 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:
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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