Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 8 am 15 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
25.1° C
0.0° 

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


Onjuku surf forecast from 15 Jul 2026:

  • Best quality surf: Sunday 19 Jul, 3AM (local time) - 4.5ft (1.3m), 9s period, ESE swell with glassy winds.
  • Most powerful swell: Tuesday 21 Jul, 3PM (local time) - 4.5ft (1.3m), 11s period, E swell with 408 kJ wave energy.
  • Next surfable swell (1★+): Sunday 19 Jul, 3AM (local time) - 4.5ft (1.3m), 9s period with ESE 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 Sunday (Jul 19) at 3AM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.3m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onjuku in the next 16 days are 1.3m 11s and forecast to arrive on Tuesday (Jul 21) at 3PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Wednesday (Jul 22) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sun 19th Jul)4.5ft (1.3m) 9s
Best Surf 3AM (Sun 19th Jul)4.5ft (1.3m) 9s
Most Powerful 3PM (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 coming up for Onjuku over the next couple of weeks. I’ll be straight with you – the start of this period is a proper write-off. We’ve got a long stretch of no good surf from Wednesday the 15th all the way through until Saturday the 19th of July. The winds are onshore or cross-onshore, the swell is tiny and weak, and the wave quality is rated as poor. It’s a grim start, so don’t bother paddling out until we get a change.

Finally, on Sunday morning, the 19th of July, we see a flicker of hope. The wind goes glassy, and the swell picks up to 4ft from the ESE with a 9-second period. The combined energy is moderate (265). This is the one standout window in the first week – glassy conditions and a clean wave face. It’s a small window, though, as the wind turns onshore by the afternoon. Onjuku is an exposed beach break, and it’s inconsistent, so don’t expect a set every minute. With crowds possible, you’ll want to be out early to grab the clean ones.

The week that follows is a mixed bag. Monday the 20th and Tuesday the 21st see the swell size holding around 4ft to 4ft, but the wind is mostly cross-onshore, keeping the surface choppy. The energy is building (332 to 452), but the quality isn’t there. Wednesday the 22nd and Thursday the 23rd bring a shift to cross-offshore winds from the ENE, cleaning things up a bit. Thursday morning looks the best of those two days with a light breeze and clean conditions, swell at 3ft from the E (10 secs, 247 energy). The water temperature is about 77°, which is average for this time of year.

Looking further out, we’ve got a big spike in size on Sunday the 26th and Monday the 27th of July. The swell jumps to 8ft to 8ft from the ENE, with an energy reading in the thousands (887 to 2060). This is strong, powerful surf, but it’s all onshore wind. The wave comment is poor or marginal. For a beach break like Onjuku, with that much size and onshore wind, it’s going to be a messy, blown-out closeout. This setup honestly looks more interesting for kite surfing than paddle surfing. The period is 10 seconds, so it’s not a clean groundswell, just a big wall of wind-affected chop.

The tail end of the forecast, on Tuesday the 29th and Wednesday the 30th of July, brings a new swell from the S and SE. The period jumps to 13 to 16 seconds – that’s proper groundswell energy. Swell heights are 5ft to 6ft, and the energy is very strong (up to 2339). The wind is light on Tuesday morning, which is promising, but it’s a long-range call, so don’t lock it in yet. This is a promising but less certain standout for the second week. If it lines up, Onjuku could see some long, clean lines, but remember, long-period swells can be tricky at beach breaks, often breaking too straight. Keep an eye on this one.

Stay patient, paddle smart, and I’ll see you in the water.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Thu night. Warm (max 28°C on Wed morning, min 25°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Sat morning, min 24°C on Sat night). Wind will be generally light.

Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
AM
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
0
1
2
0
0
0
0
0
0
0
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
E
9
0.5
E
8
0.8
E
9
0.9
ESE
8
0.9
ESE
9
1.2
ESE
8
0.8
E
8
0.9
ESE
8
0.9
ESE
8
1
E
9
1.3
ESE
9
1.3
ESE
9
1.3
ESE
9
1.3
ESE
9
1.1
E
9
1.1
E
9
1.2
E
10
1.3
E
11
1.3
E
11
1.3
E
11
1.3
E
11
Wave Graph
Metric surfscale
Energy kJ
39
31
96
120
123
188
90
118
125
154
249
245
249
254
202
205
277
379
372
408
387
Wind (km/h)
15
SSW
20
S
25
S
15
S
20
S
15
S
20
SSE
15
SE
15
SE
15
SE
15
SE
10
SE
5
SSE
15
SSE
10
SW
10
SSW
20
SSW
10
SW
15
SSW
20
SSW
10
SSW
Wind State
on
on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
glassy
on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
High Tide
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
8:32PM1.33m
9:07AM1.04m
8:57PM1.32m
Low Tide
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
3:11AM0.58m
2:24PM0.72m
clear
clear
part cloud
part cloud
part cloud
thunderstorm
part cloud
part cloud
rain showers
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:33
4:35
4:35
4:35
4:37
4:37
4:37
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:52
6:52
6:51
6:51
6:50
 mm
3
1
2
Temp °C
28
28
26
28
28
26
27
27
25
27
27
25
27
27
25
27
27
26
28
28
26
Feels °C
31
30
28
31
31
29
29
29
28
29
28
27
29
29
28
29
28
30
31
30
30
  • 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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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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