Onjuku Surf Break

Onjuku Surf Forecast and Surf Report

Lat Long: 35.18° N 140.35° E

Issued: 2 am 05 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
22.5° C

1.6°C colder than average for this time of year

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


Onjuku surf forecast from 5 Jul 2026:

  • Best quality surf: Thursday 9 Jul, 6AM (local time) - 7ft (2.2m), 15s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Saturday 11 Jul, 6AM (local time) - 8ft (2.5m), 18s period, S swell with 3,759 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 8 Jul, 3AM (local time) - 6.5ft (2.0m), 17s period with SSE 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 08) at 3AM. The primary swell is predicted to be 2.0m and 17s period with a secondary swell of 1.8m and 9s. 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 2.5m 18s and forecast to arrive on Saturday (Jul 11) at 6AM. Winds are predicted to be onshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 8th Jul)6.5ft (2.0m) 17s
Best Surf 6AM (Thu 9th Jul)7ft (2.2m) 15s
Most Powerful 6AM (Sat 11th Jul)8ft (2.5m) 18s

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


Updates in  hr  min  s Forecast update imminent

Alright folks, Rusty here, and I’ve had a proper look at what Onjuku’s got cookin’ over the next couple of weeks. Gotta be straight with you – the start of this run is a write-off. We’re looking at a few days of messy, onshore junk before the ocean finally gets its act together. There’s a window of real quality in the middle, but you’ll have to be patient. The water’s sitting at 73°, which is a bit colder than normal for this time of year, so you might want that extra rubber.

The first real chance to paddle out comes on Tuesday morning, July 7th. It’s a bit of a gamble with a “marginal” call, but the north-easterly cross-offshore wind is cleaning things up nicely. You’ve got a 4ft groundswell from the SSE, with a long 15-second period pushing waves through the lineup. The energy is ramping up strong (1311), and it looks tidy. By Wednesday the 8th, the swell builds to a solid 7ft from the same SSE direction, still with those clean offshores. The combined energy is huge (3081), but heads up – that 16-second period is a long one. At a beach break, it might be a bit too straight and racy, but if you can find the right bank, it’ll be powerful. This is expert territory at 7ft.

Honestly, the standout moment is Thursday morning, July 9th. The conditions are marked as excellent for experienced surfers. We’ve got a clean 7ft SSE swell, a 14-second period, and a light north-easterly breeze that’s keeping it glassy. The energy reading is still massive (2400), and it’ll be set after set. This is the one to circle on the calendar. After that, the wind starts to turn onshore through Friday and Saturday, and the swell gets messy with southerly winds and choppy conditions.

The following week, from July 13th onward, the size drops right back. There’s a small window on Monday morning, July 13th, with glassy conditions and a 3ft swell, but it’s tiny. Sunday, July 20th also shows some glassy early conditions with a 3ft easterly swell, which might be enough for a longboard, but don’t expect much. The rest of the second week is mostly poor, with onshore winds and small, weak waves. A blank run is fairly normal here when the swell drops out, so it’s not a huge surprise.

For the best of the best, lock in Thursday the 9th. The combination of a solid 7ft SSE swell, clean conditions, and that long-period groundswell is as good as it gets in this forecast. Crowds are possible at Onjuku, and with waves this good, you’ll want to be there early.

Rusty.

Short Range Forecast

Heavy rain (total 21mm), heaviest during Mon afternoon. Warm (max 23°C on Sun morning, min 20°C on Tue night). Mainly fresh winds.

Days 4-6 Weather Summary

Mostly dry. Warm (max 24°C on Thu morning, min 21°C on Wed night). Wind will be generally light.

Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Saturday
11
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
2
2
2
4
4
3
3
4
3
3
3
2
3
2
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)
1
SSE
5
1.3
SSE
6
1.4
SSE
7
1.6
SE
7
0.9
SE
16
2.1
ESE
7
1.3
SSE
15
1.3
SSE
14
1.8
SSE
17
2.2
SSE
16
2.2
SSE
16
2.2
SSE
16
2
SSE
14
2.3
S
16
2.3
S
15
2.3
S
16
2.3
S
16
2.4
S
18
2.3
S
17
2.1
S
16
1.8
SSW
16
Wave Graph
Metric surfscale
Energy kJ
49
104
170
221
362
419
720
672
1856
2475
2472
2398
1637
2668
2320
2689
2627
3634
3198
2323
1685
Wind (km/h)
20
SE
20
ESE
20
ESE
20
ESE
25
E
25
ENE
25
NE
30
NE
15
NE
20
ENE
15
ENE
10
E
10
ENE
10
ESE
10
SE
10
SE
15
SSE
10
SSW
15
SSW
20
SSW
20
SW
Wind State
cross-on
cross-on
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-off
cross
cross-on
cross-on
on
on
on
cross-on
cross-on
High Tide
8:26PM1.32m
7:35AM1.19m
8:56PM1.32m
8:39AM1.09m
9:27PM1.32m
10:09AM1.02m
10:03PM1.33m
12:13PM1.01m
10:46PM1.33m
2:21PM1.09m
11:39PM1.34m
3:42PM1.20m
00:41AM1.37m
Low Tide
1:33PM0.32m
2:14AM0.77m
2:06PM0.43m
3:11AM0.70m
2:42PM0.57m
4:16AM0.61m
3:24PM0.73m
5:27AM0.49m
4:20PM0.89m
6:39AM0.36m
5:47PM1.02m
7:44AM0.22m
7:27PM1.09m
light rain
cloud
cloud
light rain
mod rain
mod rain
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:28
4:28
4:30
4:30
4:31
4:31
4:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:55
6:55
6:55
6:55
6:54
6:54
6:54
 mm
3
4
7
7
Temp °C
23
23
22
22
21
21
23
23
22
23
23
21
24
24
22
24
24
23
25
25
24
Feels °C
24
22
22
22
20
19
21
21
22
22
23
22
25
26
24
25
25
25
25
25
25
Swell 1
Height (m)
Direction
Period (s)
0.5
E
7
0.4
ENE
8
1.4
SSE
7
0.6
SE
13
0.9
SE
16
0.9
SSE
14
1.3
SSE
15
1.3
SSE
14
1.9
ESE
9
2.2
SSE
16
2.2
SSE
16
2.2
SSE
16
2
SSE
14
2.3
S
16
2.3
S
15
2.3
S
16
2.3
S
16
2.4
S
18
2.3
S
17
2.1
S
16
1.8
SSW
16
Energy kJ
27
19
170
140
362
367
720
672
560
2475
2472
2398
1637
2668
2320
2689
2627
3634
3198
2323
1685
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
10
0.4
SE
10
0.4
SE
9
0.4
SE
9
0.1
SW
7
0.1
SW
7
0.3
SSE
20
0.7
SSE
20
1.8
SSE
17
1.7
E
9
1.5
E
8
1.3
E
8
1.1
E
8
1.1
E
7
1
E
7
0.9
E
7
0.9
E
7
0.8
E
8
0.8
ESE
8
0.7
ESE
9
0.6
E
9
Energy kJ
25
25
29
21
2
2
82
336
1856
452
317
208
135
131
108
83
79
86
96
79
56
Swell 3
Height (m)
Direction
Period (s)
0.2
ENE
9
0.1
NE
9
0.4
ENE
8
0.3
NE
8
0.3
NE
8
0.1
SW
6
0.3
SSE
20
0.3
SW
7
0.4
SSE
22
0.7
S
20
1
S
18
1.2
E
7
0.6
E
9
0.1
SE
15
Energy kJ
8
3
21
11
10
2
82
8
154
377
628
155
57
8
Wind waves
Height (m)
Direction
Period (s)
1
SSE
5
1.3
SSE
6
1.6
SE
7
1.7
SE
7
2.1
ESE
7
2
E
7
1.9
E
8
2.2
E
8
0.6
SSW
4
Energy kJ
49
104
221
261
419
427
453
670
8
Nearest Offshore or Glassy
Rating
(10 max)
1
1
2
1
2
2
3
3
4
4
4
4
4
4
4
4
4
5
5
4
4
Distance (km)
295
103
51
69
206
51
206
51
16
51
51
9
0
9
9
9
9
9
9
17
86
Best forecast wave conditions in Chiba
Rating
(10 max)
2
2
3
5
5
5
4
4
4
4
4
4
5
5
4
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
2
2
3
2
3
4
5
5
6
6
5
4
7
5
9
9
6
9
5
Header Global
Rating
(10 max)
5
9
7
5
5
8
7
5
5
9
8
9
9
6
6
5
5
4
6
5
5
  • Map Icons:
  • Break
  • 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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