Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 2 pm 22 Jul 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
25.9° C
0.2° 

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


Onjuku surf forecast from 22 Jul 2026:

  • Best quality surf: Thursday 23 Jul, 6AM (local time) - 2.5ft (0.8m), 10s period, E swell with cross-offshore winds.
  • Most powerful swell: Tuesday 28 Jul, 3AM (local time) - 6ft (1.8m), 7s period, SW swell with 271 kJ wave energy.
  • Next surfable swell (1★+): Thursday 23 Jul, 6AM (local time) - 2.5ft (0.8m), 10s period with E 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 23) at 6AM. The primary swell is predicted to be 0.8m and 10s period with a secondary swell of 0.8m and 6s. Another secondary swell of 1.2m and 6s is also forecast. 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 1.8m 7s and forecast to arrive on Tuesday (Jul 28) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Jul 28) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Thu 23rd Jul)2.5ft (0.8m) 10s
Best Surf 6AM (Thu 23rd Jul)2.5ft (0.8m) 10s
Most Powerful 3AM (Tue 28th Jul)6ft (1.8m) 7s

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


The Lowdown

Alright folks, Rusty here. Let's have a look at what's on the menu for the next couple of weeks.

It's a pretty quiet start, I'm not gonna lie. We’ve got a long stretch of small, ordinary surf ahead before things finally get interesting. The first week is mostly about waiting for the ocean to wake up.

We kick off on the 22nd of July at Onjuku. The wind is coming from the SW at 15 mph, which is a messy cross-on, and the swell is a weak 3 ft from the east with a 10-second period. The wave energy is low (210), so it’s poor surf. Not worth paddling out for.

The 23rd through the 31st of July is a real mixed bag of nothing special. We see some cleaner conditions with light offshore winds from the NE, but the swell is tiny, between 1 ft and 2 ft. The energy is weak, mostly in the double digits or low triple digits (74 to 225). The water temp is about 79°, which is pretty average for this time of year. It’s surfable on a longboard only if you’re desperate, but it’s very ordinary. There’s a solid gap of over a week with no real quality to speak of.

Now, the standout window arrives on the 1st of August. This is the one you’ve been waiting for. On Saturday morning, the swell jumps to 5 ft from the ESE with a 17-second period. The energy is strong (1450), and the wind is cross-off from the NE at 12 mph. This is going to be a hell of a lot better. It’s still a bit raw, but it’s the first real pulse of the forecast.

The best on offer, without a doubt, is the morning of the 2nd of August. We’re looking at a solid 7 ft ESE swell, with a 16-second period and that long-period groundswell energy is pumping at 2578. The wind is offshore from the NNE at 15 mph, which is going to groom those lines perfectly. This is excellent surf for experienced surfers. It’s a bit big for beginners, but for anyone with a bit of skill, it’s going to be clean and powerful. The swell direction is a perfect match for the break’s optimum at Onjuku. This is the session to clear your schedule for.

The 3rd of August sees the swell peak at 10 ft from the ESE with an 18-second period and massive energy (4767), but the wind swings onshore from the SSW. That’s a shame, because the size is there, but it’s going to be blown out and messy. The 4th of August is similar, with a dropping 8 ft swell but still onshore wind. After that, we're back to small, poor conditions through the 6th of August.

So, to sum it up: the first week is a dud, but the 2nd of August morning is the real deal. Get out there if you can.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Thu night. Warm (max 30°C on Wed afternoon, min 24°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 42mm), heaviest during Tue morning. Warm (max 28°C on Sun afternoon, min 22°C on Mon night). Wind will be generally light.

Wed
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
Tuesday
28
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
1
1
1
1
0
0
1
0
1
0
0
0
0
0
1
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
E
10
0.8
E
10
0.7
E
10
0.7
E
9
0.6
E
9
0.6
E
9
0.5
SE
11
0.5
SE
10
0.5
SE
10
0.4
SE
16
0.4
SE
15
0.4
SE
15
0.4
SE
15
0.5
SE
10
0.4
SE
14
0.7
ESE
10
1.7
SSW
7
0.9
SSW
7
0.8
S
7
0.5
SE
10
Wave Graph
Metric surfscale
Energy kJ
156
121
87
81
58
57
57
51
48
63
57
55
64
51
70
88
234
75
57
47
Wind (km/h)
25
SW
20
SW
10
NE
15
ENE
15
NE
15
ENE
15
ESE
5
SSE
10
NNE
15
ENE
5
NNE
10
SE
20
S
20
SW
25
NE
20
ENE
20
NE
20
NE
20
NE
15
NE
Wind State
cross-on
cross-on
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
cross-off
cross-off
cross-off
cross-on
on
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
9:26PM1.31m
10:06PM1.28m
11:05PM1.26m
4:30PM1.13m
00:24AM1.25m
4:42PM1.19m
1:35AM1.28m
5:00PM1.23m
2:32AM1.33m
5:21PM1.27m
Low Tide
5:28AM0.50m
6:45AM0.44m
7:51AM0.37m
7:16PM1.10m
8:43AM0.30m
8:40PM1.07m
9:26AM0.23m
9:28PM1.02m
10:04AM0.17m
10:04PM0.97m
clear
clear
clear
clear
thunderstorm
part cloud
part cloud
part cloud
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
mod rain
heavy rain
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:39
4:39
4:41
4:41
4:43
4:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:50
6:49
6:47
6:47
6:46
6:45
6:45
 mm
1
1
3
3
3
1
5
7
20
2
1
Temp °C
30
27
29
29
27
27
28
26
27
26
25
27
28
26
25
25
23
23
24
23
Feels °C
32
30
33
33
31
31
31
29
30
28
28
29
30
27
25
25
23
23
24
24
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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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