Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 8 pm 22 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
25.9° C
0.2° 

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


Onjuku surf forecast from 22 Jul 2026:

  • Best quality surf: Thursday 23 Jul, 6AM (local time) - 2.5ft (0.7m), 10s period, E swell with cross-offshore winds.
  • Most powerful swell: Monday 27 Jul, 3PM (local time) - 3.5ft (1.0m), 7s period, ENE swell with 99 kJ wave energy.
  • Next surfable swell (1★+): Thursday 23 Jul, 6AM (local time) - 2.5ft (0.7m), 10s period with E 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 Thursday (Jul 23) at 6AM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.7m and 6s. Another secondary swell of 1.1m 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 1.0m 7s and forecast to arrive on Monday (Jul 27) at 3PM. 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 Monday (Jul 27) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Thu 23rd Jul)2.5ft (0.7m) 10s
Best Surf 6AM (Thu 23rd Jul)2.5ft (0.7m) 10s
Most Powerful 3PM (Mon 27th Jul)3.5ft (1.0m) 7s

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


The Lowdown

Alright folks, Rusty here. Let's get into it. This outlook is all for Onjuku.

Alright, right now and for quite a while, it's gonna be a real patience tester. We're looking at a lot of small, weak surf with ordinary conditions. The wait will be worth it though. There's a serious pulse of energy heading our way, but you're going to have to sit through a long, flat spell first.

For the tail end of July and into the very start of August, the swell is tiny – we're talking knee to thigh-high at best, with a combined energy reading of under 200. The wind is mostly cross to cross-off, but the waves just aren't there to get excited about. You could get wet on a foamie, but don't expect much else.

Then, hold onto your board shorts. Come Sunday, the 2nd of August, it all changes. The forecast shows a real pulse of groundswell arriving. We're looking at a clean 5ft to 5ft swell from the ESE with a very long 16-second period. The morning is *prime* with light offshore winds and clean conditions. The combined energy absolutely jumps to 1079 – it's pumping. This is a solid size, so it's going to be more for the experienced crew. Because that period is so long and the swell direction is straight from the ESE, it might wall up a bit on the bank, but the quality of the waves will be there. The morning of the 2nd is the standout; it's the best clean, lined-up surf we've seen in this whole forecast.

The swell builds even further into Monday the 3rd and Tuesday the 4th. We're talking 8ft to 8ft range with a period pushing 17 to 18 seconds. This is a big, powerful swell. The combined energy numbers are in the thousands (3227 and 3924) – that's serious power. This is expert territory. It'll be critical to be with the wind conditions. The morning looks best with that clean, cross-off wind, but the size and power mean it's not a session for the faint of heart.

By Wednesday the 5th, the swell starts to drop back to a much friendlier 5ft, still with clean conditions in the morning. A really good day for the strong intermediate surfers to get a piece of it. After that, it fades out quickly into onshore wind and flatness by the end of the week.

So, to call it straight: the long-range standout is undeniably the morning of Sunday, the 2nd of August. The clean 5ft to 5ft groundswell with that long period will be something special. Be ready for crowds, because Onjuku can get busy when it's good. It's a long wait, but that morning looks like the one to circle.

Stay frothing.
- Rusty

Short Range Forecast

Light rain (total 4mm), mostly falling on Thu night. Warm (max 29°C on Thu morning, min 25°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 34mm), heaviest during Sat night. Warm (max 28°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light.

Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
Tuesday
28
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
0
1
1
0
0
1
0
0
0
0
0
0
1
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
E
10
0.7
E
10
0.7
E
9
0.6
E
9
0.6
E
9
0.5
SE
11
0.5
SE
10
0.4
SE
16
0.5
SE
10
0.4
SE
15
0.5
SE
10
0.4
SE
15
0.4
SE
14
0.4
SE
14
1
ENE
7
0.6
SE
10
0.5
SE
10
0.6
ESE
10
0.5
SE
10
Wave Graph
Metric surfscale
Energy kJ
121
87
81
58
57
57
51
65
49
57
53
64
72
51
99
80
49
65
47
Wind (km/h)
20
SW
15
NE
15
ENE
15
NE
15
ENE
15
ESE
15
SE
10
ENE
10
SE
10
E
10
E
10
S
20
NE
20
NE
15
ENE
10
ENE
10
NNE
5
SE
0
WSW
Wind State
cross-on
cross-off
cross-off
cross-off
cross-off
cross
cross-on
cross-off
cross-on
cross
cross
on
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
glassy
High Tide
9:26PM1.31m
10:06PM1.28m
11:05PM1.26m
4:30PM1.13m
00:24AM1.25m
4:42PM1.19m
1:35AM1.28m
5:00PM1.23m
2:32AM1.33m
5:21PM1.27m
Low Tide
5:28AM0.50m
6:45AM0.44m
7:51AM0.37m
7:16PM1.10m
8:43AM0.30m
8:40PM1.07m
9:26AM0.23m
9:28PM1.02m
10:04AM0.17m
10:04PM0.97m
clear
clear
clear
thunderstorm
part cloud
part cloud
rain showers
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
rain showers
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:39
4:39
4:41
4:41
4:43
4:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:50
6:49
6:47
6:47
6:46
6:45
6:45
 mm
1
1
2
13
1
3
10
1
2
3
1
1
Temp °C
27
29
29
27
28
28
26
27
28
26
27
28
24
24
25
25
27
28
25
Feels °C
30
32
32
30
32
31
29
31
32
30
31
32
25
25
27
28
31
32
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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