Onjuku Surf Forecast

/ Chiba (19 surf breaks) /

Japan (129 surf breaks) / Lat Long: (35.18° N 140.35° E)

Surf Forecasts:

Onjuku surfForecast / Chiba / Japan

12 Day Weather and Surf, issued 8 am Wednesday 22 Oct 2025 JST

Forecast update in hr min s Forecast update imminent

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

Today's Onjuku sea temperature is 25.4° C
(Which is 2.4°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Onjuku this week:

The surf forecast for Onjuku over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Oct 26) at 6PM. The primary swell is predicted to be 3.5m and 10s period. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Onjuku in the next 12 days are 4.5m 10s and forecast to arrive on Sunday (Oct 26) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Thursday (Oct 23) at 3AM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	6PM (Sun 26th Oct)	11ft (3.5m) 10s
Best Surf	6PM (Sun 26th Oct)	11ft (3.5m) 10s
Most Powerful	3PM (Sun 26th Oct)	15ft (4.5m) 10s

Table - best surf conditions forecast for Onjuku over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Heavy rain (total 28mm), heaviest during Wed morning. Very mild (max 18°C on Thu afternoon, min 12°C on Wed night). Mainly strong winds.									Days 3-6 Weather Summary Heavy rain (total 113mm), heaviest during Sun morning. Warm (max 21°C on Sat night, min 16°C on Sun night). Winds decreasing (fresh winds from the SSE on Sat night, light winds from the NW by Sun night).
	Wednesday 22			Thursday 23			Friday 24			Saturday 25			Sunday 26			Monday 27			Tuesday 28
	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	1	1	0	1	0	1	3	2	2	0	0	0	3	3	1	1	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	ESE	ENE	ESE	E	E	ENE	ENE	ENE	E	E	E	ESE	SE	SSE	SE	SE	SE	ESE	ESE	ESE	ESE
Period(s) (?)	8	8	8	8	7	8	8	8	10	9	9	8	8	10	9	9	9	9	9	9	9
Wave Graph (?)
kJ (?)	238	620	326	309	120	385	410	588	985	665	753	655	1419	4077	1325	734	497	327	248	161	276
Wind (km/h)	NNE	NE	NNE	N	NNE	NNE	NNE	NE	NNE	NE	ESE	SSE	SE	SSE	NNW	NNE	E	NE	NNE	NE	NE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	off	cross- off	off	off	cross- off	off	cross- off	cross- off	cross- off	cross- off	cross	cross- on	cross- on	cross- on	cross- off	off	cross	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)		4:06PM 1.42		5:31AM 1.36	4:26PM 1.43		6:06AM 1.33	4:46PM 1.43		6:43AM 1.27	5:09PM 1.41		7:24AM 1.20	5:32PM 1.38		8:16AM 1.13	5:58PM 1.33		9:36AM 1.09		6:25PM 1.26
Low Tide / height (m)	10:28AM 0.70		10:50PM 0.16	10:52AM 0.76		11:18PM 0.14	11:16AM 0.83		11:49PM 0.15	11:38AM 0.88		12:22AM 0.19	11:59AM 0.93		1:00AM 0.25		12:21PM 0.98	1:45AM 0.33		12:49PM 1.04	2:44AM 0.41

	Wednesday 22			Thursday 23			Friday 24			Saturday 25			Sunday 26			Monday 27			Tuesday 28
Sunrise	5:48	-	-	5:50	-	-	5:50	-	-	5:52	-	-	5:52	-	-	5:54	-	-	5:54	-	-
Sunset	-	4:55	-	-	4:53	-	-	4:52	-	-	4:52	-	-	4:51	-	-	4:50	-	-	4:49	-

Rain (mm)	13	11	4	-	-	-	-	-	-	1	2	22	45	36	-	-	2	5	1	-	-
Temp. °C	13	14	13	17	18	17	18	18	18	19	20	21	20	21	18	21	20	18	16	16	16
Feels °C (?)	6	8	8	12	13	12	13	13	14	17	18	16	17	20	18	20	18	14	11	11	11

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Chiba

Wind Update The wind is still offshore at Onjuku (moderate winds from the N at Katsuura 5 km from Onjuku). 2.6m 7s swell from the NE with a 1.4m 8s swell from the ESE. 2 swells combining so expect closeout sets.
2 hours 21 minutes ago Onjuku

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2 h 21 min ago

22 km/h

Offshore

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Onjuku surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

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 12 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.