Onjuku Surf Break

Onjuku Surf Forecast and Surf Report

Lat Long: 35.18° N 140.35° E

Issued: 8 am 20 Jun 2026 (local time)

Forecast update in  hr  min

Today's Onjuku sea temperature is
22.9° C

Normal for this time of year

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

Surf Forecasts:

Onjuku surf forecast from 20 Jun 2026:

  • Best quality surf: Tuesday 23 Jun, 9PM (local time) - 5.5ft (1.7m), 11s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Tuesday 23 Jun, 3PM (local time) - 5.5ft (1.7m), 11s period, ENE swell with 713 kJ wave energy.
  • Next surfable swell (1★+): Monday 22 Jun, 12AM (local time) - 5ft (1.5m), 8s period with SSW 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 Monday (Jun 22) at 12AM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.8m and 9s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Onjuku in the next 16 days are 1.7m 11s and forecast to arrive on Tuesday (Jun 23) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Monday (Jun 22) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Mon 22nd Jun)5ft (1.5m) 8s
Best Surf 9PM (Tue 23rd Jun)5.5ft (1.7m) 11s
Most Powerful 3PM (Tue 23rd Jun)5.5ft (1.7m) 11s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast

Moderate rain (total 16mm), heaviest on Sat night. Warm (max 26°C on Sun afternoon, min 19°C on Mon night). Winds decreasing (strong winds from the SSW on Sun morning, calm by Mon morning).

Days 4-6 Weather Summary

Moderate rain (total 14mm), heaviest on Wed night. Warm (max 23°C on Thu afternoon, min 18°C on Tue night). Winds decreasing (fresh winds from the NNE on Tue morning, light winds from the SSE by Wed night).

Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
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
0
2
2
0
2
0
1
3
1
0
1
0
0
0
0
0
0
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
ENE
9
0.9
ENE
8
1
ENE
10
1.9
S
6
1.9
SSW
7
1.5
SSW
8
0.9
ENE
10
0.9
ENE
10
0.8
ENE
10
1.7
ENE
8
1.7
ENE
11
1.6
ENE
11
1.4
ENE
11
1.3
ENE
10
1.1
ENE
10
1
ENE
10
0.9
ENE
11
0.7
ENE
10
0.6
ENE
10
1.2
SSE
6
1.2
S
7
Wave Graph
Metric surfscale
Energy kJ
101
101
197
290
326
291
167
173
123
374
713
550
427
345
223
183
164
94
65
90
134
Wind (km/h)
20
SE
20
SE
30
SSE
40
SSW
35
SW
10
N
0
NE
15
S
15
N
30
NNE
25
NE
10
ENE
10
E
20
SSE
10
S
10
SE
20
SSE
15
S
15
SSE
20
SSE
15
SSE
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
off
glassy
on
off
cross-off
cross-off
cross-off
cross
on
on
cross-on
on
on
cross-on
on
on
High Tide
9:18PM1.26m
8:09AM1.17m
9:51PM1.26m
9:32AM1.05m
10:24PM1.27m
11:22AM0.98m
11:00PM1.28m
1:23PM1.00m
11:39PM1.29m
2:54PM1.06m
00:23AM1.30m
3:51PM1.14m
1:08AM1.31m
Low Tide
2:13PM0.30m
2:53AM0.84m
2:54PM0.47m
4:07AM0.74m
3:34PM0.64m
5:22AM0.64m
4:19PM0.78m
6:30AM0.53m
5:17PM0.90m
7:26AM0.42m
6:31PM0.98m
8:14AM0.33m
7:44PM1.02m
light rain
light rain
mod rain
thunderstorm
clear
part cloud
part cloud
part cloud
thunderstorm
part cloud
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:24
—
—
4:24
—
—
4:24
—
—
4:24
—
—
4:24
—
—
4:24
—
—
4:24
—
—
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
—
6:54
—
—
6:55
—
—
6:55
—
—
6:55
—
—
6:55
—
—
6:55
—
—
6:55
—
 mm
2
4
8
1
—
—
—
—
1
—
—
—
1
2
5
3
2
1
—
—
2
Temp °C
23
22
23
24
26
24
25
25
24
20
19
19
21
22
21
22
23
22
23
23
22
Feels °C
24
22
21
22
23
24
27
26
27
16
15
18
20
21
21
23
22
22
23
23
22
Swell 1
Height (m)
Direction
Period (s)
0.8
ENE
9
0.9
ENE
8
1
ENE
10
0.8
ENE
10
0.8
ENE
9
1.5
SSW
8
0.9
SSW
8
0.9
ENE
10
0.8
ENE
10
0.4
SE
11
0.5
SSE
11
1.6
ENE
11
1.4
ENE
11
1.3
ENE
10
1.1
ENE
10
1
ENE
10
0.9
ENE
11
0.8
SE
6
0.6
ENE
10
0.4
ENE
10
1.1
SE
6
Energy kJ
101
101
197
123
115
291
127
173
123
32
70
550
427
345
223
183
164
43
65
38
88
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
10
0.4
SE
10
0.2
SSE
12
0.4
SE
11
0.3
SE
9
0.8
ENE
9
0.9
ENE
10
0.4
SE
10
0.8
SSW
8
0.4
SSW
6
0.4
SE
11
0.4
SSE
11
0.5
SE
11
0.4
SE
11
0.5
SE
10
0.4
SE
10
0.4
SE
10
0.7
ENE
10
0.4
SSW
12
0.4
SE
11
0.4
SE
10
Energy kJ
24
24
14
31
14
118
167
25
82
11
43
46
56
40
53
35
35
94
47
40
32
Swell 3
Height (m)
Direction
Period (s)
0.1
SW
7
0.2
SSW
7
0.1
SW
7
0.1
SE
9
0.3
SE
11
0.4
SE
10
0.4
SE
10
0.1
E
16
0.4
SE
10
0.3
SW
8
0.4
SW
7
0.1
S
10
0.2
S
5
0.1
S
11
0.3
S
10
0.3
S
9
0.2
SSW
12
0.7
S
6
0.4
SE
11
0.4
SW
12
0.4
NE
9
Energy kJ
2
4
2
3
20
23
25
5
26
9
16
2
2
2
18
15
15
31
40
35
22
Wind waves
Height (m)
Direction
Period (s)
0.7
SE
4
0.6
SE
4
0.9
SSE
9
1.9
S
6
1.9
SSW
7
0.4
NE
2
—
0.9
SSW
8
0.3
NNE
3
1.7
ENE
8
1.7
ENE
11
—
—
0.6
S
4
0.9
SSE
5
0.9
SSE
5
1
SSE
5
0.9
SSW
6
0.9
SSE
6
1.2
SSE
6
1.2
S
7
Energy kJ
16
15
133
290
326
2
—
99
2
374
713
—
—
10
37
46
58
54
49
90
134
Nearest Offshore or Glassy
Omaezaki
Shizuoka
Kisami-Ohama Beach
Shizuoka
Hashikui Bay
Shikoku
Tsujido Beach
Kanagawa
Gomoda
Shikoku
Onjuku
Chiba
Onjuku
Chiba
Ohara
Chiba
Onjuku
Chiba
Akabane Long Beach
Shizuoka
Gomoda
Shikoku
Onjuku
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Ohara
Chiba
Rating
(10 max)
1
1
2
1
1
2
2
2
2
1
1
3
2
2
2
2
2
1
1
1
2
Distance (km)
206
143
557
86
536
0
0
9
0
295
536
0
9
9
9
9
9
9
9
9
9
Best forecast wave conditions in Chiba
Uchiboso
Mera
Tsurigasaki Surfing Beach (Tokyo 2020)
Big Ben
Onjuku
Shida
Shida
Big Ben
Shida
Shida
Tsurigasaki Surfing Beach (Tokyo 2020)
Ohara
Shida
Tsurigasaki Surfing Beach (Tokyo 2020)
Rating
(10 max)
3
4
2
2
3
2
2
2
2
2
1
1
1
2
Best forecast wave conditions in Japan
Omaezaki
Shizuoka
Kaiser's (Hachijojima Island)
Izu Islands
Hashikui Bay
Shikoku
Akabane Long Beach
Shizuoka
Osaki Point
Shikoku
Uchiboso
Chiba
Mera
Chiba
Keta Reef Oshima
Izu Islands
Big Ben
Chiba
Niyodo Rivermouth
Shikoku
Steps
Okinawa
Steps
Okinawa
Steps
Okinawa
Nagata
Kyu Shu
Niyodo Rivermouth
Shikoku
Niyodo Rivermouth
Shikoku
Ozaki
Shikoku
Niyodo Rivermouth
Shikoku
Niyodo Rivermouth
Shikoku
Niyodo Rivermouth
Shikoku
Niyodo Rivermouth
Shikoku
Rating
(10 max)
1
1
2
3
2
3
4
2
2
1
3
3
3
2
2
2
3
2
3
3
2
Header Global
Trial Harbour
Australia
Buchupureo
Chile
Buchupureo
Chile
Buchupureo
Chile
Buchupureo
Chile
Etang-Sale
Reunion
Saint Leu
Reunion
Papatowai
New Zealand
Tora Point
New Zealand
Barrancon
Chile
El Olon de Ilo
Peru
Heaven
South Africa
Hell
South Africa
Fish Boma
South Africa
Papatowai
New Zealand
Boneyards
South Africa
Ahijedero
Mexico
Cobblestones
Australia
Cobblestones
Australia
Supertubes
Australia
Cobblestones
Australia
Rating
(10 max)
6
5
8
9
6
8
8
6
6
5
5
7
9
7
8
5
4
9
9
9
9
  • 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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