Onjuku Surf Break

Lat Long: 35.18° N 140.35° E

Onjuku Surf Forecast and Surf Report

Issued: 2 am 14 Sep 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
26.1°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 13 Sep 2026:

  • Best quality surf: Saturday 19 Sep, 3AM (local time) - 8ft (2.5m), 14s period, SE swell with offshore winds.
  • Most powerful swell: Saturday 19 Sep, 6AM (local time) - 10ft (3.0m), 14s period, SE swell with 3,180 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 15 Sep, 9PM (local time) - 2.5ft (0.7m), 13s 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 Tuesday (Sep 15) at 9PM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.7m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onjuku in the next 16 days are 3.0m 14s and forecast to arrive on Saturday (Sep 19) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Thursday (Sep 17) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Tue 15th Sep)2.5ft (0.7m) 13s
Best Surf 3AM (Sat 19th Sep)8ft (2.5m) 14s
Most Powerful 6AM (Sat 19th Sep)10ft (3.0m) 14s

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


Short Range Forecast

Heavy rain (total 48mm), heaviest during Tue afternoon. Warm (max 27°C on Mon morning, min 21°C on Wed morning). Winds increasing (calm on Tue night, fresh winds from the NNE by Wed night).

Days 4-6 Weather Summary

Heavy rain (total 32mm), heaviest during Sat night. Warm (max 25°C on Sat morning, min 21°C on Thu night). Winds decreasing (fresh winds from the NNE on Thu night, calm by Sat night).

Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
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
0
0
0
1
2
0
0
0
0
0
0
1
2
4
4
3
3
5
3
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SSE
10
1.2
SSE
9
1.2
SE
9
0.7
E
14
0.8
E
14
0.7
E
13
0.8
E
13
0.8
E
12
0.6
E
12
1.6
NE
7
2
ENE
7
2.1
ENE
8
2.4
ENE
8
1.5
SE
15
2.5
SE
15
3
SE
13
3
SE
12
3
SE
12
3
SE
11
1.8
SSE
13
2
S
13
Wave Graph
Metric surfscale
Energy kJ
76
236
231
206
261
167
215
193
102
214
406
514
698
1006
2779
2843
2659
2227
1882
1058
1258
Wind (km/h)
25
SSW
25
SSW
25
WSW
20
SSW
10
SSW
5
NW
25
NNE
25
NE
25
NNE
30
NNE
35
NNE
35
NNE
35
NNE
40
NNE
25
N
10
E
15
NE
10
ESE
20
N
20
NNE
15
NNE
Wind State
cross-on
cross-on
cross-on
cross-on
on
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
off
off
cross
cross-off
cross-on
off
cross-off
off
High Tide
5:44PM1.44m
6:45AM1.29m
6:03PM1.43m
7:26AM1.19m
6:22PM1.41m
8:14AM1.09m
6:42PM1.37m
9:27AM0.99m
7:03PM1.31m
7:24PM1.24m
7:46PM1.15m
Low Tide
11:50AM0.57m
00:19AM0.26m
12:11PM0.69m
00:53AM0.27m
12:28PM0.79m
1:31AM0.32m
12:40PM0.87m
2:15AM0.40m
12:34PM0.94m
3:18AM0.48m
5:00AM0.52m
clear
part cloud
light rain
thunderstorm
thunderstorm
mod rain
mod rain
light rain
rain showers
cloud
part cloud
cloud
cloud
cloud
light rain
light rain
light rain
heavy rain
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:18
5:20
5:20
5:22
5:22
5:22
5:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:47
5:46
5:45
5:44
5:42
5:40
5:38
 mm
3
3
19
6
7
4
6
3
4
4
21
Temp °C
27
26
26
24
24
25
22
22
22
22
22
21
21
22
23
25
22
23
23
23
23
Feels °C
28
26
27
25
28
30
22
21
22
19
19
17
17
20
24
28
23
26
24
24
25
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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