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Surf Forecasts:

Onjuku surf break

Onjuku surfForecast / Chiba / Japan

information circle12 Day Weather and Surf, issued 8 am Friday 13 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
17.1° C
 (Which is slightly warmer than usual)

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 Monday (Feb 16) at 6AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.4m and 9s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Onjuku in the next 12 days are 2.0m 7s and forecast to arrive on Monday (Feb 16) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Monday (Feb 16) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Mon 16th Feb)3.5ft (1.0m) 7s
Best Surf 9AM (Mon 16th Feb)3.5ft (1.1m) 12s
Most Powerful 3AM (Mon 16th Feb)6.5ft (2.0m) 7s

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 Mostly dry. Very mild (max 15°C on Sun morning, min 8°C on Fri morning). Winds increasing (calm on Sat morning, fresh winds from the SW by Sat night).

Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Mon night. Very mild (max 13°C on Wed afternoon, min 5°C on Mon night). Winds decreasing (fresh winds from the NE on Mon night, calm by Tue night).

Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
1
1
1
0
0
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.3
SW
0.2
SSW
0.3
SE
0.3
SE
0.3
SE
1.1
SW
0.9
SSW
0.9
SSW
1.5
SW
1.1
ENE
1.7
ENE
1.7
NE
1.2
ENE
0.5
E
0.5
E
0.5
E
0.6
E
0.6
E
0.8
NE
0.5
E
0.8
NE
Period(s) (?)7710101056671267611111111128128
Wave
Graph
(?)Metric surfscale
Energy kJ (?)951515155553501983592462531036265639199827695
Wind
(km/h)
15
N
10
N
5
N
0
S
15
S
35
SW
30
SW
25
SW
25
WSW
20
NNE
35
NE
30
NNE
25
NE
10
E
20
S
10
NNW
5
NW
25
NE
30
NE
20
ENE
15
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffglassglassoncross-
on		cross-
on		cross-
on		cross-
on		offcross-
off		cross-
off		cross-
off		crossonoffcross-
off		cross-
off		cross-
off		cross-
off		cross
High Tide
/ height (m)
12:17PM
1.20
4:39AM
1.21
1:46PM
1.25
4:49AM
1.27
2:44PM
1.33
5:05AM
1.31
3:30PM
1.40
5:22AM
1.35
4:12PM
1.45
5:40AM
1.39
4:52PM
1.47
5:59AM
1.41
5:33PM
1.46
Low Tide
/ height (m)
8:46PM
0.33
9:04AM
1.05
9:26PM
0.23
9:38AM
0.97
10:00PM
0.16
10:08AM
0.88
10:32PM
0.12
10:38AM
0.78
11:01PM
0.12
11:09AM
0.67
11:30PM
0.17
11:42AM
0.57
11:58PM
0.25
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Sunrise6:26--6:26--6:24--6:24--6:22--6:22--6:20--
Sunset-5:17--5:19--5:20--5:20--5:21--5:22--5:22-
cloud
part cloud
clear
clear
cloud
part cloud
clear
clear
clear
cloud
cloud
light rain
part cloud
cloud
cloud
light rain
clear
part cloud
part cloud
part cloud
light rain
Rain (mm)
-----------3---2----1
Temp. °C9991313141515131210689121213128810
Feels °C (?)4671010799772-325910117126
  • Map Icons:
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  • 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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