Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 2 pm 14 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 14 Jul 2026:

  • Best quality surf: Sunday 19 Jul, 12AM (local time) - 3ft (0.9m), 9s period, E swell with glassy winds.
  • Most powerful swell: Friday 17 Jul, 9AM (local time) - 3.5ft (1.1m), 9s period, ESE swell with 190 kJ wave energy.
  • Next surfable swell (1★+): Friday 17 Jul, 3AM (local time) - 3ft (0.9m), 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 Friday (Jul 17) at 3AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.3m and 10s. Another secondary swell of 0.6m and 4s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onjuku in the next 16 days are 1.1m 9s and forecast to arrive on Friday (Jul 17) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Tuesday (Jul 21) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Fri 17th Jul)3ft (0.9m) 9s
Best Surf12AM (Sun 19th Jul)3ft (0.9m) 9s
Most Powerful 9AM (Fri 17th Jul)3.5ft (1.1m) 9s

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


The Lowdown

Alright, let’s talk about what’s coming up for Onjuku.

Honestly, mate, the next week and a half is gonna test your patience. There’s a real long quiet stretch here. We’ve got nothing worth paddling out for from the start all the way through to the morning of Tuesday, 29 July. That’s over two weeks of waiting. The wind is mostly onshore or cross-onshore, and the swell is tiny and weak. The energy is barely registering most days—often under 200 (weak to moderate energy). It’s pretty frustrating.

The one and only standout in this whole 16-day window is the morning of Tuesday, 29 July. That’s your best bet by a long shot. Onjuku picks up a solid groundswell from the SE. Swell height hits 4 feet, with a very long period of 13 seconds. That long period means the waves will have real shape and push, but because it’s a beach break, it might run a bit straight. The energy is strong—560 (very strong wave energy). And the wind goes glassy, light from the NE. That’s gonna make for clean, lined-up sets. For an intermediate surfer, this is the session to aim for. Crowds can be "sometimes" an issue here, so expect company.

The afternoon of the 29th drops off quickly as the wind turns onshore, so get it early.

Water temp is 77°, which is about average for the time of year, so not a worry.

Before that? Honestly, nothing. The swell stays small—under 3 feet—and the wind is almost always messy. Short period swells too, mostly around 8 to 9 seconds, so no grunt. A few mornings like Sunday 20th and Tuesday 21st have glassy or clean conditions, but the waves are barely there and the energy is weak (under 180). Not worth getting excited over.

The second half of the month is a blank run. This isn’t unusual for the area when the wind patterns lock in bad. But once that SE groundswell and glassy morning line up on the 29th, it’s a proper reward for the wait.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Fri morning. Warm (max 29°C on Tue afternoon, min 26°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Some drizzle, heaviest during Fri afternoon. Warm (max 27°C on Fri afternoon, min 24°C on Sat night). Wind will be generally light.

Tue
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
1
2
1
0
1
1
0
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)
0.6
S
10
0.6
S
10
0.5
E
9
0.5
E
8
0.8
E
9
0.8
ESE
9
0.8
ESE
8
0.8
ESE
8
1.1
ESE
9
0.8
E
8
0.7
E
8
0.8
E
8
0.9
SE
9
0.9
E
9
0.8
E
9
0.8
E
9
0.9
E
9
0.9
E
8
0.9
E
8
0.8
E
9
0.8
E
9
Wave Graph
Metric surfscale
Energy kJ
80
71
39
31
96
99
96
96
190
92
68
84
107
133
96
97
123
115
113
95
93
Wind (km/h)
15
S
15
SSW
15
S
20
S
25
SSW
10
SW
20
SSW
10
SW
10
SSE
20
SSE
15
SE
10
E
15
ESE
5
ENE
5
E
10
SSE
5
NE
5
ENE
10
SE
0
S
5
S
Wind State
on
on
on
on
on
cross-on
on
cross-on
cross-on
cross-on
cross-on
cross
cross
glassy
glassy
cross-on
cross-off
cross-off
cross-on
glassy
glassy
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
9:07AM1.04m
Low Tide
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
3:11AM0.58m
part cloud
clear
clear
clear
part cloud
part cloud
clear
part cloud
thunderstorm
thunderstorm
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
<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>
6:53
6:52
6:52
6:52
6:52
6:51
6:51
6:50
 mm
1
1
Temp °C
29
26
28
28
27
29
28
27
28
27
26
27
27
25
26
26
25
27
27
25
27
Feels °C
31
28
31
31
29
32
31
32
32
29
29
29
29
28
30
29
29
30
30
28
31
  • 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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