Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 2 pm 16 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
25.3° 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 16 Jul 2026:

  • Best quality surf: Thursday 23 Jul, 6AM (local time) - 4.5ft (1.3m), 10s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Tuesday 21 Jul, 6AM (local time) - 4.5ft (1.3m), 11s period, E swell with 394 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 22 Jul, 6AM (local time) - 3.5ft (1.1m), 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 Wednesday (Jul 22) at 6AM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.3m and 4s. Another secondary swell of 0.4m and 4s is also forecast. The wind is predicted to be 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 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Thursday (Jul 23) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Wed 22nd Jul)3.5ft (1.1m) 10s
Best Surf 6AM (Thu 23rd Jul)4.5ft (1.3m) 10s
Most Powerful 6AM (Tue 21st Jul)4.5ft (1.3m) 11s

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


The Lowdown

Alright folks, Rusty here. Let's have a look at what's on the table for Onjuku. Gotta be straight with you – the next couple of weeks are looking pretty grim. There's a big, empty gap at the start here; we don't have any surf worth paddling out for until the morning of Wednesday the 22nd, and even then it's just scraping a pass. Basically, the next 6 days are a write-off.

Water temp's sitting around 78°, which is about average for this time of year, so at least you won't be freezing while you're sitting there waiting for nothing.

Let's run through it. The first flicker of life shows up on Wednesday the 22nd morning, with a 4ft easterly swell. The wind's coming from the NE at 12 mph, which gives us a cross-off breeze – that's the only reason it's even worth a mention, because it'll keep the surface clean. The wave energy is moderate (255), but honestly, the swell period is a short 10 seconds and the conditions are still described as marginal. Honestly, not one to get excited about.

The only real standout in this whole 16-day window is Thursday morning the 23rd. We've got a clean 4ft E swell rolling in with a 10-second period, and the wind is a nice cross-off breeze from the ENE at 9 mph. Wave energy is moderate (282), and for the first time in ages, the data says we can "expect good surf conditions". This is your best shot, plain and simple. The swell direction from the E isn't a perfect match for the optimum SSE at Onjuku, but with clean conditions, it'll be the most rideable wave on offer. It's a long way out, so don't book the day off just yet, but keep an eye on it.

After that, things get messy again. The morning of Sunday the 26th sees a tiny 2ft SE swell, but with a nice light cross-off breeze from the NNE. The wave energy is moderate (244), and it's clean, but it's barely a ripple. Later that day and into Monday the 27th, there's a bump in size to 4ft from the SSE, but the period stretches out to 14 seconds. That's a long-period groundswell, which can be tricky at a beach break like Onjuku – tends to wall up and close out. The wind is light, so it won't be choppy, but the data calls it "marginal".

The last week just falls apart. Stiff onshore winds and building chop dominate from the 29th onward. Even a pulse of 5ft SSW swell on the morning of the 29th comes with a 16 mph cross-onshore wind and a choppy surface – that's expert-only, borderline unrideable, and might be more fun for the kite crew than a paddler. A late pulse on the 31st brings a 3ft ESE swell with a very long 14-second period, but it's being hammered by a 22 mph cross-onshore breeze. Forget it.

Bottom line: You've got one morning to chase – Thursday the 23rd. Everything else is a tough slog.

Rusty

Short Range Forecast

Light rain (total 5mm), mostly falling on Thu night. Warm (max 28°C on Thu afternoon, min 25°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Wed morning. Warm (max 28°C on Tue morning, min 24°C on Sun night). Wind will be generally light.

Thu
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
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
0
0
1
0
0
0
0
0
0
0
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
ESE
9
0.9
ESE
8
0.9
ESE
8
1.1
ESE
8
0.9
ESE
8
0.9
ESE
8
0.9
ESE
9
1
ESE
9
1.2
ESE
9
1.2
ESE
9
1.1
E
9
1
E
9
1.2
E
10
1.2
E
10
1.3
E
11
1.3
E
11
1.2
E
10
1.1
E
10
1.1
E
10
1
E
10
Wave Graph
Metric surfscale
Energy kJ
99
118
120
173
122
120
140
185
222
222
194
148
271
271
394
372
288
233
233
192
Wind (km/h)
20
S
10
S
20
SSE
15
SSE
10
SE
15
SE
15
SSE
15
S
15
S
15
S
10
SSW
10
SSW
20
SSW
15
SW
10
SSW
20
SSW
15
SW
25
NE
25
NE
15
NE
Wind State
on
on
on
cross-on
cross-on
cross-on
on
on
on
on
cross-on
on
on
cross-on
cross-on
on
cross-on
cross-off
cross-off
cross-off
High Tide
6:54PM1.36m
5:24AM1.49m
7:20PM1.34m
6:15AM1.41m
7:45PM1.33m
7:06AM1.30m
8:08PM1.33m
8:01AM1.17m
8:32PM1.33m
9:07AM1.04m
8:57PM1.32m
10:41AM0.95m
9:26PM1.31m
Low Tide
11:55PM0.87m
12:29PM0.08m
00:40AM0.77m
1:04PM0.23m
1:26AM0.69m
1:34PM0.40m
2:16AM0.63m
2:01PM0.57m
3:11AM0.58m
2:24PM0.72m
4:14AM0.54m
2:41PM0.85m
clear
thunderstorm
thunderstorm
clear
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
rain showers
rain showers
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:35
4:35
4:37
4:37
4:37
4:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:52
6:51
6:51
6:50
6:50
 mm
4
1
3
2
Temp °C
28
26
27
27
25
27
26
25
26
26
25
27
27
26
28
28
26
27
27
25
Feels °C
31
29
29
29
27
29
27
28
28
28
28
29
29
30
32
30
29
28
28
28
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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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