Onjuku Surf Break

Onjuku Surf Forecast and Surf Report

Lat Long: 35.18° N 140.35° E

Issued: 8 pm 05 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
22.0° C

2.2°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: Wednesday 8 Jul, 6AM (local time) - 8ft (2.4m), 16s period, SE swell with cross-offshore winds.
  • Most powerful swell: Saturday 11 Jul, 6AM (local time) - 8ft (2.5m), 17s period, S swell with 3,734 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 7 Jul, 6AM (local time) - 3ft (0.9m), 14s 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 Tuesday (Jul 07) at 6AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.1m and 7s. 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 17s 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+) 6AM (Tue 7th Jul)3ft (0.9m) 14s
Best Surf 6AM (Wed 8th Jul)8ft (2.4m) 16s
Most Powerful 6AM (Sat 11th Jul)8ft (2.5m) 17s

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


Updates in  hr  min  s Forecast update imminent

Alright folks, Rusty here. Let’s take a look at what’s coming down the pipe for Onjuku over the next couple of weeks.

Right off the bat, we’ve got a bit of a quiet start. The first few days are nothing to write home about, with weak, short-period windswell and dodgy side-shore winds. The real action starts kicking up from Tuesday the 7th. We see the combined swell energy jumping from 270 into the moderate range, and things start to get interesting.

The standout window is undoubtedly Wednesday the 8th. That morning, Onjuku will be waking up to a solid 8ft swell pushing in from the SE with a long 16-second period, giving it real grunt. The combined energy is pumping at 3303 (strong), and with that gentle ENE cross-off breeze, the face is going to be clean and inviting. This is proper groundswell, the kind that sets up nice lines on the points. This is the session you pencil in. It’s a bigger day though, at over 8ft by the afternoon, so this one is really only for the experienced crew. If you’re not comfortable in that range, sit it out.

Following that, Thursday the 9th and Friday the 10th stay fairly solid, with swell sitting above 6ft, but winds turn cross-onshore and eventually onshore, so the quality won’t be as pristine as that Wednesday morning. The energy remains high (2346 to 3620), but the wind will put a bit of a chop on it.

There’s a bit of a lull after the 12th, with things dropping off as we head into the second week. The swell backs right down, and the energy drops to low two-digit and three-digit values, so we’re talking weak conditions for a few days. However, keep your eyes on Thursday the 16th. That morning we get a quick pulse of 4ft from the east with a true offshore from the north, and the winds are light offshore. The water temp is sitting about average for this time of year, which is fine.

The weekend of the 19th and 20th shows some more size building, with 6ft to 7ft and a period stretching to 12 seconds, but those winds are howling at 28 mph by Monday. That is going to be a full-on, blown-out mess – more of a kite-surfing situation than a paddle session. The tail end of the 21st sees a drop in size but with a strong offshore wind, making it clean but tough to paddle into.

All in all, the clear winner is Wednesday morning July 8th. Set your alarm.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sun night. Warm (max 24°C on Tue morning, min 21°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 25°C on Fri morning, min 22°C on Wed night). Wind will be generally light.

Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Saturday
11
Sun
12
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
0
0
1
2
3
2
4
5
4
4
3
3
3
3
2
3
3
1
2
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
SE
6
0.6
SE
13
0.9
SE
16
1.1
SE
14
1.4
SE
15
1.7
SE
14
1.7
SE
13
2.4
SE
16
2.4
SSE
16
2.2
SSE
16
1.9
SSE
14
2.5
SSE
16
2.3
S
15
2.4
S
16
2.5
S
16
2.4
S
17
2.4
S
17
2.2
S
17
2
S
16
1.7
SSW
16
1.5
S
16
Wave Graph
Metric surfscale
Energy kJ
94
140
362
466
784
1139
976
3067
2750
2398
1484
3021
2311
2964
3441
3364
3474
2734
2221
1493
1102
Wind (km/h)
15
ESE
15
ESE
20
ESE
15
ESE
15
ENE
20
E
15
ENE
15
ENE
15
E
5
ESE
10
ESE
10
SE
5
S
15
SSE
15
SSE
10
SSW
15
SSE
15
S
15
S
20
S
15
S
Wind State
cross-on
cross
cross
cross
cross-off
cross
cross-off
cross-off
cross
cross-on
cross-on
cross-on
on
on
on
on
on
on
on
on
on
High Tide
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
4:34PM1.30m
Low Tide
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
8:43AM0.08m
light rain
part cloud
part cloud
cloud
part cloud
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:28
4:30
4:30
4:31
4:31
4:31
4:33
<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
6:53
 mm
2
Temp °C
22
23
23
22
24
24
22
24
24
22
24
24
23
25
24
23
24
25
24
24
24
Feels °C
22
22
22
22
23
24
23
24
25
23
25
25
25
27
24
25
25
25
25
24
25
Swell 1
Height (m)
Direction
Period (s)
0.4
SE
9
1.1
SE
7
0.9
SE
16
1.1
SE
7
1.4
SE
15
1.7
SE
14
1.7
SE
13
2.4
SE
16
2.4
SSE
16
2.2
SSE
16
1.9
SSE
14
2.5
SSE
16
2.3
S
15
2.4
S
16
2.5
S
16
2.4
S
17
2.4
S
17
2.2
S
17
2
S
16
1.7
SSW
16
1.5
S
16
Energy kJ
28
109
362
109
784
1139
976
3067
2750
2398
1484
3021
2311
2964
3441
3364
3474
2734
2221
1493
1102
Swell 2
Height (m)
Direction
Period (s)
0.4
ENE
8
0.6
SE
13
0.4
ENE
8
1.1
SE
14
1.1
ESE
7
0.4
SSE
20
1.2
SSE
17
0.5
S
22
0.9
SSE
20
1
ESE
8
1.1
S
18
0.6
ESE
7
0.7
ESE
8
0.9
ESE
10
0.6
E
9
0.5
E
9
0.5
E
9
0.5
E
9
0.5
E
9
0.5
E
9
Energy kJ
19
140
23
466
102
154
818
236
640
133
749
41
63
137
59
41
40
40
40
40
Swell 3
Height (m)
Direction
Period (s)
0.3
SE
14
0.4
ENE
8
0.1
SW
7
0.3
ENE
7
0.2
WSW
6
0.1
NE
7
1.3
SSE
13
1.2
S
19
1
S
19
0.9
ESE
8
0.4
ESE
9
0.5
E
10
0.1
SE
15
0.1
SE
14
0.1
SE
13
Energy kJ
32
21
2
10
4
2
512
1026
723
113
27
47
8
7
7
Wind waves
Height (m)
Direction
Period (s)
1.1
SE
6
1.2
SE
7
1.4
ESE
7
0.7
ESE
7
0.7
SSE
4
Energy kJ
94
135
214
42
15
Nearest Offshore or Glassy
Rating
(10 max)
1
2
1
3
3
3
4
5
4
5
4
5
4
5
5
5
5
4
4
4
4
Distance (km)
17
9
68
9
0
51
0
0
51
9
9
9
9
9
9
9
9
9
9
9
9
Best forecast wave conditions in Chiba
Rating
(10 max)
1
2
3
3
3
4
5
5
5
4
5
4
5
5
5
5
4
4
4
4
Best forecast wave conditions in Japan
Rating
(10 max)
1
2
2
3
3
3
4
5
5
5
5
5
8
9
9
9
5
9
5
4
4
Header Global
Rating
(10 max)
7
6
5
8
7
5
5
9
8
9
6
7
8
8
6
9
6
4
9
7
7
  • 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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