Onjuku Surf Break

Onjuku Surf Forecast and Surf Report

Lat Long: 35.18° N 140.35° E

Issued: 8 am 03 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
22.2° C

1.7°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 3 Jul 2026:

  • Best quality surf: Wednesday 8 Jul, 9PM (local time) - 8ft (2.5m), 16s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Wednesday 8 Jul, 12AM (local time) - 8ft (2.5m), 17s period, SE swell with 4,243 kJ wave energy.
  • Next surfable swell (1★+): Friday 3 Jul, 3PM (local time) - 3ft (0.9m), 6s period with NE 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 03) at 3PM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.6m and 6s. 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 Wednesday (Jul 08) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 7s period and expected on Monday (Jul 06) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Fri 3rd Jul)3ft (0.9m) 6s
Best Surf 9PM (Wed 8th Jul)8ft (2.5m) 16s
Most Powerful12AM (Wed 8th 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 have a look at what Onjuku's got in store for us over the next couple of weeks. It's a tale of two halves, really – a bit of a slow start, then a big pulse of energy that'll get the blood pumping.

Right off the bat, the first half of the week is pretty quiet. We're looking at small, short-period windswell for the most part. Friday the 3rd through Sunday the 5th, you're dealing with knee-to-waist high stuff at best, and the winds are all over the place – cross-off, cross-on, onshore. It’s mostly poor conditions, so don’t get too excited. We're in a bit of a lull there.

Things start to get interesting on Monday the 6th. The swell kicks up to a solid 7ft from the ESE, and the energy jumps way up (718) with a clean cross-off wind. It’s still a bit raw with that 7-second period, but it's a sign of what's coming. By Monday afternoon, the energy is pumping (1162) and the swell holds. Tuesday the 7th is where it gets serious. We're talking 6ft to 8ft of SSE groundswell, period hits 16 seconds – that's proper long-period energy. The combined energy goes through the roof, from 1765 up to 3224 by the afternoon. The winds are offshore from the north-east, keeping it clean. This is expert territory though – over 8ft and that long period will be lining up fast and heavy at the beach break. It’s gonna be a handful.

Wednesday the 8th and Thursday the 9th are the real standouts for the experienced crew. We've got 7ft to 8ft of that long-period SSE groundswell, and the energy numbers are massive, peaking at 5617 on Wednesday afternoon. The wind stays cross-off and light, with Thursday morning looking particularly good – clear skies, gentle breeze, and the forecast even calls it "excellent" for experienced surfers. This is the best on offer. If you’re an expert, get on it. It's too big for beginners, and with crowds "sometimes" a thing at Onjuku, you might have some company, but the quality will be worth it.

The swell sticks around through Friday the 10th, but the wind turns onshore from the south, messing up the surface. By Saturday the 11th, it’s getting choppy and blown out. After that big pulse, it drops back down.

We hit a bit of a gap for a few days. Sunday the 12th has a small window in the morning with a clean 5ft swell and light cross-off wind, but it fades fast. Then Monday the 13th is a tiny, glassy morning with 3ft – ideal for a longboard. Tuesday the 14th is even smaller. Wednesday the 15th is totally blown out with gale-force winds.

But then, looking ahead to the second week, there’s another promising pulse. Thursday the 16th brings back 6ft to 7ft from the SE with a clean cross-off wind. Then Friday the 17th morning is a real highlight for the second week – 7ft of SSE swell, light offshore breeze from the ENE (3 mph), and the report calls it "excellent" for experienced surfers again. Energy is a solid 1381. Saturday the 18th caps it off nicely with 4ft to 5ft of S to SSW swell and perfect conditions – glassy flat calm in the morning, then a clean offshore breeze in the afternoon. That Saturday is looking like a great option for a wider range of surfers, with the swell size more manageable.

So, to sum it up: The big, powerful SSE groundswell from the 7th to the 9th is the main event for experts. For the more manageable stuff, keep an eye on the glassy mornings on the 13th and the clean conditions on the 18th.

Stay safe out there.
Rusty.

Short Range Forecast

Moderate rain (total 11mm), heaviest on Sun night. Warm (max 23°C on Fri afternoon, min 21°C on Fri morning). Winds increasing (calm on Fri night, fresh winds from the ENE by Sun night).

Days 4-6 Weather Summary

Some drizzle, heaviest during Mon morning. Warm (max 23°C on Tue morning, min 20°C on Tue night). Winds decreasing (fresh winds from the NE on Mon morning, light winds from the ENE by Wed night).

Friday
3
Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
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
1
1
0
0
0
0
0
0
1
2
4
2
4
4
4
5
4
5
4
5
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
NE
6
0.9
NE
6
0.7
ENE
7
0.7
E
7
0.6
E
8
0.6
E
8
1.1
SE
5
1.3
ESE
5
2.1
ESE
7
2.2
ESE
7
2.2
ESE
8
0.9
SSE
16
1.7
SSE
16
2.5
SE
16
2.5
SE
17
2.5
SSE
16
2.5
SSE
16
2.1
SSE
14
2.2
SSE
14
2.5
SSE
16
2.5
S
15
Wave Graph
Metric surfscale
Energy kJ
54
59
42
51
43
42
59
88
389
526
512
425
1555
3222
4243
3685
3569
1676
1956
3485
3053
Wind (km/h)
20
NNE
15
ENE
5
E
10
SE
15
SSE
5
SSE
20
ESE
20
ESE
25
E
30
ENE
30
NE
20
NNE
25
NNE
25
NE
20
NE
25
NE
20
NE
10
ENE
15
ENE
10
E
5
SSE
Wind State
cross-off
cross-off
cross-off
cross-on
on
on
cross-on
cross-on
cross
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
glassy
High Tide
7:31PM1.30m
6:00AM1.34m
7:58PM1.31m
6:44AM1.27m
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
Low Tide
12:30PM0.16m
00:39AM0.87m
1:02PM0.23m
1:24AM0.82m
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
part cloud
part cloud
part cloud
cloud
light rain
light rain
cloud
cloud
mod rain
light rain
cloud
part cloud
part cloud
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>
4:28
4:28
4:28
4:28
4:30
4:30
4:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:55
6:55
6:55
6:55
6:55
6:55
6:54
 mm
1
1
9
1
Temp °C
22
23
22
23
23
22
23
23
22
22
22
21
23
23
22
23
23
23
25
25
23
Feels °C
22
23
24
25
24
24
23
23
22
19
20
20
21
22
22
22
22
26
27
27
27
Swell 1
Height (m)
Direction
Period (s)
0.7
S
6
0.9
NE
6
0.7
ENE
7
0.7
E
7
0.6
E
8
0.6
E
8
0.4
SE
10
0.6
S
6
0.4
SE
14
0.6
SSE
13
1.9
ESE
8
1.6
ESE
8
1.7
SSE
16
2.5
SE
16
2.5
SE
17
2.5
SSE
16
2.5
SSE
16
2.1
SSE
14
2.2
SSE
14
2.5
SSE
16
2.5
S
15
Energy kJ
39
59
42
51
43
42
25
26
53
114
411
288
1555
3222
4243
3685
3569
1676
1956
3485
3053
Swell 2
Height (m)
Direction
Period (s)
0.4
NE
11
0.6
S
6
0.4
SSE
6
0.3
SSE
5
0.4
NE
10
0.3
SE
10
0.2
ENE
9
0.2
ENE
9
0.4
SE
17
0.6
SE
12
0.9
SSE
16
1.4
ESE
8
0.1
NE
7
0.8
SSE
21
1.9
S
17
1.5
S
16
1.4
S
17
0.5
ESE
8
0.5
E
9
Energy kJ
30
27
11
6
26
16
8
8
76
120
425
210
2
611
2048
1204
1164
32
41
Swell 3
Height (m)
Direction
Period (s)
0.4
SE
9
0.4
SE
9
0.4
NE
11
0.4
NE
10
0.3
SE
11
0.2
ENE
10
0.1
W
6
0.1
SE
16
0.1
SW
7
0.4
SSE
17
0.6
SE
11
0.5
E
9
Energy kJ
19
21
29
27
18
9
1
9
2
119
99
40
Wind waves
Height (m)
Direction
Period (s)
0.8
NE
6
0.4
SSE
5
0.5
S
4
1.1
SE
5
1.3
ESE
5
2.1
ESE
7
2.2
ESE
7
2.2
ESE
8
1.8
ESE
8
Energy kJ
54
8
7
59
88
389
526
512
375
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
4
3
4
4
4
4
4
5
4
5
Distance (km)
16
0
0
9
9
9
587
73
103
51
73
0
73
51
51
51
51
0
0
51
0
Best forecast wave conditions in Chiba
Rating
(10 max)
2
1
1
1
1
1
1
4
5
5
6
5
5
5
5
5
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
1
1
1
1
1
1
2
2
4
4
5
6
6
5
5
5
5
6
Header Global
Rating
(10 max)
9
5
9
5
6
8
5
9
7
5
9
9
8
6
5
9
9
9
5
5
6
  • 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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