Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 8 pm 08 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
23.1° C
1.5° 

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


Onjuku surf forecast from 8 Jul 2026:

  • Best quality surf: Thursday 9 Jul, 3AM (local time) - 6ft (1.9m), 14s period, SSE swell with glassy winds.
  • Most powerful swell: Saturday 11 Jul, 9AM (local time) - 7ft (2.2m), 17s period, S swell with 2,867 kJ wave energy.
  • Next surfable swell (1★+): Thursday 9 Jul, 3AM (local time) - 6ft (1.9m), 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 Thursday (Jul 09) at 3AM. The primary swell is predicted to be 1.9m and 14s period with a secondary swell of 0.9m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onjuku in the next 16 days are 2.2m 17s and forecast to arrive on Saturday (Jul 11) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Tuesday (Jul 14) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Thu 9th Jul)6ft (1.9m) 14s
Best Surf 3AM (Thu 9th Jul)6ft (1.9m) 14s
Most Powerful 9AM (Sat 11th Jul)7ft (2.2m) 17s

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


Alright, take a look at what Onjuku has in store. It’s a pretty frustrating run, I won’t lie. Loads of swell coming through, but the wind is just ruining it for most of the time. We’ve got a long stretch of messy, onshore junk before we finally get a proper clean window.

The week starts on Thursday the 9th with a solid 6ft swell from the SSE, packing some serious energy (1626). The problem? That cross-on wind from the SE is putting a ripple on it. It’s surfable, but you’ll be fighting the chop. It’s not a standout. That swell builds through Friday and Saturday, hitting over 7ft from the S with periods stretching out to 17 seconds – proper groundswell energy, with readings in the 2000s to nearly 3000. But the wind is just as bad, a steady onshore blow. That much power with onshore wind is a war zone. Saturday afternoon it gets so messy the score drops to zero. For the beginner surfer, anything over 5ft is already getting serious, and with this onshore wind it’s a real handful. That long period also means the waves will be heaving, not a friendly paddle for learning.

Sunday the 12th offers no relief; more onshore wind, more average surf in the 5–6ft range. Monday morning the swell drops right back to a tiny 3ft, but the wind swings around ENE in the afternoon, giving us a bit of a clean look. The wave energy is weak (338), so it’s more of a longboard cruise than a proper session.

The most promising moment in this whole outlook, and I mean the one true standout, is Tuesday morning the 14th. The swell is tiny at 2ft from the SE, but the wind goes totally glassy – dead calm. Combined energy is a very weak 178, so we’re talking knee-high dribblers at best. But if you’ve got a foamie and you want a flat, clean, easy paddle, this is your window. It’s a rare moment of peace in an otherwise windy run.

From Wednesday the 15th through the weekend of the 19th, it’s a saga of onshore and cross-onshore wind. Swell stays between 3ft and 7ft, mainly from the ESE, with short, weak periods of 8–9 seconds. It’s all just messy and choppy. There’s a flicker of hope on Sunday the 19th with a clean cross-off wind from the ENE on a 7ft ESE swell, but the wind is moderate and it’s still a beach break prone to closing out on that short period.

The real payoff, if you can wait, is Tuesday the 21st of July. This is the one to circle on your calendar. The swell drops to 4ft, but it’s from the S with a gorgeous 14-second period, giving it a proper long-range groundswell feel. The combined energy is strong (1051). The real magic is the clean, cross-off wind from the ENE. This is excellent surf for experienced surfers, with proper shape and power. Those long-period S swells love a point or reef setup, and here at Onjuku, it should hold up. This is your best bet by a long shot.

After that, it fades back to tiny and onshore for the rest of the outlook. For the love of surfing, wait for the 21st. You won’t regret it.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 25°C on Thu morning, min 23°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 10mm), heaviest on Mon morning. Warm (max 27°C on Tue morning, min 24°C on Sat night). Wind will be generally light.

Thursday
9
Friday
10
Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wed
15
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
3
3
2
2
2
1
2
1
0
0
1
0
0
0
2
2
1
0
0
0
0
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)
1.9
SSE
15
1.9
SSE
14
1.6
SSE
13
2
S
14
2.1
S
15
2.2
S
16
2.2
S
16
2.2
S
17
2.2
S
16
2.1
SSW
17
1.9
SSW
16
1.6
SSW
16
1.3
SSW
15
1
SSW
14
0.9
SSW
13
0.8
SSW
12
0.7
SE
9
0.7
SE
9
1.5
ESE
7
1.5
ESE
8
1.6
SE
8
Wave Graph
Metric surfscale
Energy kJ
1559
1306
828
1663
1847
2339
2542
2867
2669
2324
1875
1278
744
384
227
189
83
90
209
292
338
Wind (km/h)
5
SE
10
SE
15
SSE
10
SSW
10
S
20
S
15
SSW
20
SSW
25
SSW
20
SSW
20
SSW
25
SSW
20
SSW
10
SW
10
ENE
5
WSW
5
S
20
S
15
SW
15
SW
25
SSW
Wind State
cross-on
cross-on
on
on
on
on
cross-on
on
on
cross-on
on
cross-on
cross-on
cross-on
cross-off
glassy
glassy
on
cross-on
cross-on
cross-on
High Tide
10:03PM1.33m
12:13PM1.01m
10:46PM1.33m
2:21PM1.09m
11:39PM1.34m
3:42PM1.20m
00:41AM1.37m
4:34PM1.30m
1:44AM1.42m
5:16PM1.35m
2:44AM1.47m
5:52PM1.37m
3:40AM1.51m
Low Tide
5:27AM0.49m
4:20PM0.89m
6:39AM0.36m
5:47PM1.02m
7:44AM0.22m
7:27PM1.09m
8:43AM0.08m
8:45PM1.11m
9:36AM-0.02m
9:42PM1.09m
10:24AM-0.09m
10:29PM1.03m
11:09AM-0.09m
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
part cloud
part cloud
rain showers
mod rain
part cloud
rain showers
rain showers
part cloud
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:31
4:31
4:31
4:33
4:33
4:33
4:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:55
6:54
6:54
6:54
6:53
6:53
6:53
6:52
 mm
1
6
1
2
Temp °C
23
25
25
24
25
25
24
25
25
24
26
26
25
25
25
24
27
26
25
27
26
Feels °C
26
27
26
26
27
26
26
26
25
25
26
27
27
28
28
28
29
27
27
28
26
  • 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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