Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 8 pm 13 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
24.8° C
0.3° 

Onjuku surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Onjuku surf forecast from 13 Jul 2026:

  • Best quality surf: Saturday 18 Jul, 9AM (local time) - 3ft (0.9m), 10s period, SE swell with cross-offshore winds.
  • Most powerful swell: Tuesday 21 Jul, 3AM (local time) - 4.5ft (1.3m), 11s period, E swell with 388 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 14 Jul, 3AM (local time) - 2.5ft (0.8m), 11s period with SSW swell.

Best Forecast Surf Conditions for Onjuku this week:

The surf forecast for Onjuku over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Jul 14) at 3AM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 0.3m and 9s. Another secondary swell of 0.2m and 6s 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 16 days are 1.3m 11s and forecast to arrive on Tuesday (Jul 21) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Tue 14th Jul)2.5ft (0.8m) 11s
Best Surf 9AM (Sat 18th Jul)3ft (0.9m) 10s
Most Powerful 3AM (Tue 21st Jul)4.5ft (1.3m) 11s

Table - best surf conditions forecast for Onjuku over the next 16 days.


The Lowdown

Alright, this is Rusty, and I’m looking at the next couple of weeks here. Honestly, it’s a pretty quiet stretch for the most part. We’ve got a small window of half-decent waves, but you’ll have to be patient.

The first few days are a write-off. Tuesday the 14th through to Friday the 17th are all poor surf with onshore winds and weak, messy little waves. Nothing worth paddling out for.

Things finally start looking up on Saturday the 18th. The wind swings around to a cross-offshore breeze from the ENE, and the ocean cleans right up. The swell is a modest 3 ft from the SE, with a period of 10 seconds, and the combined swell energy is a moderate 261. It’s not huge, but it’s clean and surfable.

The best of the lot looks like the morning of Sunday the 19th. We’ve got that same clean cross-offshore wind, light breeze at 10 km/h, with a 3 ft swell from the east (8 seconds). The combined energy is a solid 219. It’s the only time in the whole run where the conditions line up properly for a decent session. If you’ve got a shortboard, that’s your window.

After that, it’s back to onshore slop and average conditions. The wind turns onshore again from the 20th onwards, and the surf quality drops right off. There’s a bit of a clean-up on the 24th and 25th with glassy mornings, but the swell is tiny – 2 ft to 1 ft – so it’s really only for the longboard or a foiler.

The last few days (27th to 29th) see a bit more energy, with a clean cross-offshore wind, but the swell is small and the periods are long, which means it’ll be a bit tricky to find a proper wave. The combined energy on the 27th afternoon hits 394, which is decent, but it’s a longer period groundswell, so it might be better suited to a point or reef than this beach break. It’s a maybe, not a guarantee.

Overall, the standout is the Sunday 19th morning session. That’s your best bet. Everything else is a bit of a gamble or just not worth the hassle.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 28°C on Tue morning, min 24°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Thu night. Warm (max 27°C on Fri morning, min 24°C on Fri night). Wind will be generally light.

Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Mon
20
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
2
1
0
0
0
0
0
0
0
0
0
0
0
2
2
2
2
0
1
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
SSW
11
0.7
S
11
0.6
S
10
0.6
S
10
0.5
E
9
0.7
SSW
9
0.7
E
8
0.7
E
8
0.8
ESE
8
0.8
ESE
8
0.9
E
9
0.8
E
8
0.8
E
8
0.9
SE
10
0.8
SE
9
1
E
9
1
E
8
1
E
8
1.1
E
8
1
E
8
1
E
8
Wave Graph
Metric surfscale
Energy kJ
213
116
80
71
40
88
71
64
92
94
119
90
86
154
113
146
135
140
165
137
137
Wind (km/h)
5
NE
5
SE
15
S
15
SSW
15
SSW
25
S
25
SSW
20
SSW
20
SSW
15
S
15
SSE
15
SE
10
ESE
15
ENE
15
ENE
10
ENE
10
ENE
10
ESE
5
SSE
5
S
15
S
Wind State
cross-off
glassy
on
cross-on
cross-on
on
on
on
on
on
on
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
glassy
on
High Tide
2:44AM1.47m
5:52PM1.37m
3:40AM1.51m
6:24PM1.37m
4:33AM1.52m
6:54PM1.36m
5:24AM1.49m
7:20PM1.34m
6:15AM1.41m
7:45PM1.33m
7:06AM1.30m
8:08PM1.33m
8:01AM1.17m
Low Tide
9:42PM1.09m
10:24AM-0.09m
10:29PM1.03m
11:09AM-0.09m
11:12PM0.96m
11:51AM-0.03m
11:55PM0.87m
12:29PM0.08m
00:40AM0.77m
1:04PM0.23m
1:26AM0.69m
1:34PM0.40m
2:16AM0.63m
2:01PM0.57m
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
thunderstorm
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
clear
clear
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:33
4:33
4:35
4:35
4:35
4:37
4:37
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:53
6:53
6:52
6:52
6:52
6:52
6:51
6:51
 mm
2
Temp °C
27
28
28
26
28
27
26
27
27
26
27
27
25
26
26
24
26
27
25
27
27
Feels °C
31
31
31
29
30
28
27
29
29
29
29
29
29
28
28
27
29
30
29
30
30
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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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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 16 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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