Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 8 am 14 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 14 Jul 2026:

  • Best quality surf: Friday 17 Jul, 3AM (local time) - 2.5ft (0.8m), 9s period, E swell with cross-offshore winds.
  • Most powerful swell: Friday 17 Jul, 12PM (local time) - 3ft (0.9m), 9s period, ESE swell with 134 kJ wave energy.
  • Next surfable swell (1★+): Friday 17 Jul, 3AM (local time) - 2.5ft (0.8m), 9s 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 Friday (Jul 17) at 3AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.6m and 4s. 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 0.9m 9s and forecast to arrive on Friday (Jul 17) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Monday (Jul 20) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Fri 17th Jul)2.5ft (0.8m) 9s
Best Surf 3AM (Fri 17th Jul)2.5ft (0.8m) 9s
Most Powerful12PM (Fri 17th Jul)3ft (0.9m) 9s

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


The Lowdown

Alright folks, Rusty here with a look at what's on the cards for the local stretch.

Straight up, the next week and a half is looking pretty flat and ordinary. We’ve got small, weak surf and onshore winds making a mess of things for the most part. It’s a long wait for the real action.

The first real sniff of anything comes on the morning of Friday, July 17th. Onjuku will have a small 3ft swell from the east at 9 seconds, but the wind is off-shore, so it’ll be clean. The water’s sitting at about 77°, which is pretty much average for the time of year. The real story is the wait. We have a long, drawn-out period of nothing until we get to the following week.

The standout window is the last few days of the month. On Monday, July 27th, you’ll see a solid 5ft swell from the southeast, with a very long 15-second period. This is real groundswell energy building, with the combined energy hitting 1335 (strong). The wind is light, so it’s not going to be blown out. It’s getting big, so this is for the confident crew.

Then hold onto your boards. Wednesday, July 29th is the pick of the entire forecast. We’re talking a proper 10ft to 12ft southeast swell, with that 18-second period – that’s very long period energy, and the combined energy is massive (6509). The wind is off-shore, which is a dream for a spot that usually gets onshore. This is expert territory only. It’s going to be a big, powerful, clean set-up, but if you’re not on your game, it will chew you up. This is the one to circle.

So, a long slow start, but a real finish on the horizon. It’s a waiting game, but it should be worth it.

Rusty.

Short Range Forecast

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

Days 4-6 Weather Summary

Light rain (total 9mm), mostly falling on Fri morning. Warm (max 29°C on Fri afternoon, min 25°C on Sat night). Wind will be generally light.

Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
SSW
11
0.6
S
10
0.5
S
10
0.5
E
9
0.5
E
8
0.8
E
8
1.3
SSW
6
0.8
ESE
8
0.8
E
9
0.9
E
9
0.9
ESE
8
0.8
E
8
0.8
E
8
0.7
E
9
0.7
E
9
0.8
E
9
0.8
E
9
0.8
E
9
0.7
E
8
0.8
ENE
8
0.8
E
8
Wave Graph
Metric surfscale
Energy kJ
123
80
50
39
32
92
97
94
101
127
120
90
88
74
74
95
102
97
68
90
88
Wind (km/h)
5
S
15
S
15
SSW
15
SSW
20
S
25
SSW
15
SW
20
SSW
10
SW
10
ENE
15
SSE
15
SSE
15
SE
20
SSE
10
SE
10
S
15
S
10
SSW
15
SSW
20
SSW
10
SW
Wind State
glassy
on
cross-on
cross-on
on
on
cross-on
on
cross-on
cross-off
on
cross-on
cross-on
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
High Tide
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
8:32PM1.33m
Low Tide
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
clear
clear
part cloud
part cloud
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
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
6:52
6:52
6:52
6:52
6:51
6:51
 mm
2
2
4
1
Temp °C
29
28
26
28
28
26
28
28
26
28
29
26
27
27
25
27
27
26
28
28
26
Feels °C
32
30
29
30
30
28
31
30
29
33
32
29
29
29
28
30
30
30
32
30
29
  • 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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