Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 2 pm 19 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
25.4° C
0.1° 

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


Onjuku surf forecast from 19 Jul 2026:

  • Best quality surf: Thursday 23 Jul, 6AM (local time) - 2.5ft (0.8m), 10s period, E swell with glassy winds.
  • Most powerful swell: Monday 20 Jul, 9PM (local time) - 4ft (1.2m), 11s period, E swell with 335 kJ wave energy.
  • Next surfable swell (1★+): Thursday 23 Jul, 6AM (local time) - 2.5ft (0.8m), 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 0.8m and 10s period with a secondary swell of 0.3m and 5s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onjuku in the next 16 days are 1.2m 11s and forecast to arrive on Monday (Jul 20) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Jul 24) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Thu 23rd Jul)2.5ft (0.8m) 10s
Best Surf 6AM (Thu 23rd Jul)2.5ft (0.8m) 10s
Most Powerful 9PM (Mon 20th Jul)4ft (1.2m) 11s

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


The Lowdown

G’day, Rusty here. Look, I’ll be straight with you – this stretch at Onjuku is a bit of a slow burn. We’ve got a solid 16-day window, but there’s a real gap at the start. The first few days are pretty much a write-off, with poor surf conditions and messy cross-onshore winds messing things up. It’s not until Thursday the 23rd that we start to see a glimmer, and even then, it’s just small, clean surf but nothing to write home about. The real action kicks off around Monday the 27th and Tuesday the 28th, but then it gets blown out again by strong winds from the 29th onwards. So, there’s a long wait for a very short window of goodness.

Water temp is sitting at 78°, which is pretty much bang on average for the time of year, so no surprises there.

The best of the lot, the standout, is Tuesday the 28th in the morning. That’s the one you want to circle. Swell from the South at 4ft, with a solid 14-second period – that’s proper groundswell energy. It’s got a combined energy of 861 (moderate), and with a light cross-off shore breeze from the ENE, it’s going to be clean. It’s a bit of a tease though, because the afternoon gets a bit lumpy with a cross-shore wind. Even so, that morning session is the best call of the whole forecast.

The Monday afternoon before that, the 27th, is also worth a paddle. Swell from the SE at 2ft, 10-second period, and clean cross-off winds. Combined energy of 252 (moderate). It’s small, but it’ll be a fun little session.

Now, a few things to keep in mind. Onjuku is inconsistent, so don’t expect it to fire every day. It’s also an exposed beach, and the optimum swell direction is SSE, so the South and SSE swells we get later in the window are a good match. However, the bigger swells on the 29th and 30th – up to 6ft – are all blown out by strong onshore winds, so it’s just a mess. For a beginner, anything over 5ft is a bit much, and that 6ft is only for the experienced crew, but with the wind howling, it’s not really surfable for anyone.

For the rest of the second week, from the 29th onwards, it’s a case of watching the wind. There’s a lot of energy in the water – combined energy readings over 1000 in places (strong) – but the onshore winds make it sloppy. The 2nd of August has a little bit of hope with lighter winds, but it’s still marginal.

So, to sum it up: wait until Monday the 27th for a small clean window, and then attack Tuesday the 28th morning. After that, it’s a waiting game for the next decent pulse.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 29°C on Mon afternoon, min 25°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Thu night. Warm (max 29°C on Wed afternoon, min 23°C on Fri night). Wind will be generally light.

Sun
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
1
0
0
1
1
1
0
0
0
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)
1
E
9
0.9
E
9
0.9
E
9
0.9
E
8
1.2
E
11
1.1
E
10
1.1
E
10
1
E
10
1
E
10
0.9
E
10
0.8
E
10
0.8
E
9
0.7
E
9
0.7
E
9
0.6
E
9
0.5
SE
11
0.4
SE
16
0.4
SE
16
0.4
SE
16
0.4
SE
15
Wave Graph
Metric surfscale
Energy kJ
165
127
119
116
329
257
247
196
196
156
118
111
81
80
57
57
66
65
63
57
Wind (km/h)
20
S
15
SSW
15
SSW
20
SSW
20
SW
10
SW
20
SSW
15
SW
5
SSW
15
SSW
10
SW
5
NE
15
E
5
NE
20
NE
20
ENE
15
NE
15
NE
15
ENE
5
NE
Wind State
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-off
cross-off
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
8:08PM1.33m
8:01AM1.17m
8:32PM1.33m
9:07AM1.04m
8:57PM1.32m
10:41AM0.95m
9:26PM1.31m
10:06PM1.28m
11:05PM1.26m
4:30PM1.13m
00:24AM1.25m
Low Tide
2:16AM0.63m
2:01PM0.57m
3:11AM0.58m
2:24PM0.72m
4:14AM0.54m
2:41PM0.85m
5:28AM0.50m
6:45AM0.44m
7:51AM0.37m
7:16PM1.10m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
part cloud
thunderstorm
light rain
part cloud
part cloud
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:37
4:37
4:39
4:39
4:39
4:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:51
6:51
6:50
6:50
6:49
6:47
6:47
 mm
3
1
3
5
Temp °C
27
26
28
29
26
29
29
26
29
29
27
29
29
27
27
26
24
25
25
24
Feels °C
29
29
32
31
29
33
32
29
35
33
31
33
33
33
29
28
26
27
27
27
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  • 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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