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

48hr Weather and Surf, issued 2 am Monday 13 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 25.6° C
(Which is 1.8°C warmer than normal for this time of year)

How big are the waves at Onjuku today?

The current surf forecast for Onjuku at 5AM is: 1.2m 7s primary swell from a South direction and 0.5m 10s secondary swell from a Northeast direction (forecast issued at 02:00am October 13). The wind direction is predicted to be cross-offshore and the swell rating is 2.

Time (JST) & Date	Wave Height	Wave Period
Morning (13 Oct)	2.5ft (0.7m)	12s
Afternoon (13 Oct)	7ft (2.2m)	12s
Evening (13 Oct)	6.5ft (2.0m)	10s

Table - waves today at Onjuku. (Swell directed towards the surf break)

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Monday 13								Tuesday 14								Wednesday 15
	0 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM	0 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM	0 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM
Rating (10 max)	1	2	2	0	0	2	2	1	1	1	1	1	1	2	3	3	3	3	3	3	1	2	2	2
Swell Height Map See all maps
Wave Height (m) & direction (?)	SW	S	S	SW	SSW	S	SSE	SSE	SSE	NE	NE	NE	ENE	ENE	E	E	E	E	E	E	E	E	E	E
Period(s) (?)	10	7	7	12	13	12	11	10	10	8	8	8	8	9	9	10	10	10	10	10	10	10	10	10
Wave Graph (?)
kJ (?)	305	138	120	154	958	1415	1387	792	511	520	445	390	400	542	690	910	821	723	708	725	652	838	849	627
Wind (km/h)	W	N	NE	NE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	N	N	N	N	NNE	NE	NE	NE	NE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	glass	cross- off	cross- off	cross- off	off	off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	off	off	off	off	off	off	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)					10:54AM 1.09			6:45PM 1.35								7:19PM 1.22						2:21PM 1.18
Low Tide / height (m)		2:17AM 0.21				12:27PM 1.09					3:33AM 0.34								5:16AM 0.42					7:25PM 1.07

	Monday 13								Tuesday 14								Wednesday 15
Sunrise	-	-	5:41	-	-	-	-	-	-	-	5:41	-	-	-	-	-	-	-	5:43	-	-	-	-	-
Sunset	-	-	-	-	-	5:07	-	-	-	-	-	-	-	5:06	-	-	-	-	-	-	-	5:04	-	-

Rain (mm)	4	1	-	1	-	-	-	-	-	-	-	-	-	-	-	-	-	1	-	-	-	-	-	-
Temp. °C	22	22	22	23	23	22	21	20	20	20	20	20	20	21	20	19	18	17	17	19	22	22	21	22
Feels °C (?)	25	25	23	23	20	17	16	15	16	16	16	15	16	18	18	17	16	15	15	16	20	20	18	21

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 Continuing clean conditions at Onjuku (light winds from the NNE at Katsuura 5 km from Onjuku). 0.9m 7s swell from the SSE with a 0.7m 9s swell from the ENE and a 0.6m 10s swell from the S. 3 swells combining to make bigger set waves.
1 hour 33 minutes ago Onjuku

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1 h 33 min ago

7 km/h

NNE

Clean

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