Kuminatu Surf Forecast

/ Chiba (19 surf breaks) /

Japan (129 surf breaks) / Lat Long: (35.12° N 140.24° E)

Surf Forecasts:

Kuminatu surfForecast / Chiba / Japan

48hr Weather and Surf, issued 2 pm Monday 25 Aug 2025 JST

Forecast update in hr min s Forecast update imminent

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

Today's Kuminatu sea temperature is 27.1° C
(Which is normal for this time of year)

How big are the waves at Kuminatu today?

The current surf forecast for Kuminatu at 5PM is: 0.4m 8s primary swell from a East-southeast direction and 0.2m 7s secondary swell from a East direction, 0.2m 5s secondary swell from a South-southwest direction (forecast issued at 02:00pm August 25). The wind direction is predicted to be cross-onshore.

Time (JST) & Date	Wave Height	Wave Period
Morning (25 Aug)	-	-
Afternoon (25 Aug)	1.5ft (0.4m)	8s
Evening (25 Aug)	1ft (0.3m)	8s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Monday 25				Tuesday 26								Wednesday 27								Thursday 28
	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	0 AM	3 AM	6 AM	9 AM
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	SSW	SW	SW	ESE	ESE	SW	SW	SW	SW	SW	SW	SW	SW	WSW	E
Period(s) (?)	8	8	8	8	8	9	9	8	8	4	4	4	10	10	4	5	5	5	5	5	5	5	6	9
Wave Graph (?)
Energy (?)	30	34	40	26	35	30	31	38	35	32	45	58	67	76	83	81	86	115	144	154	150	127	190	91
Wind (km/h)	ESE	SSE	S	SW	SW	SW	SW	SSW	SSW	SSW	SSW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	W	NNE	NE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- on	on	cross- on	glass	cross	cross	cross- on	cross- on	cross- on	cross- on	cross- on	cross- on	cross- on	cross- on	cross	cross- on	cross- on	cross- on	cross- on	cross- on	cross	cross- off	cross- off	cross- off
High Tide / height (m)				6:10PM 1.50			5:58AM 1.51					6:28PM 1.50				6:34AM 1.44				6:45PM 1.49				7:11AM 1.35
Low Tide / height (m)	11:48AM 0.30				12:00AM 0.59					12:14PM 0.40				12:29AM 0.53				12:38PM 0.52				12:59AM 0.48

	Monday 25				Tuesday 26								Wednesday 27								Thursday 28
Sunrise	-	-	-	-	-	-	5:05	-	-	-	-	-	-	-	5:07	-	-	-	-	-	-	-	5:07	-
Sunset	-	-	6:15	-	-	-	-	-	-	-	6:15	-	-	-	-	-	-	-	6:13	-	-	-	-	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	30	29	28	27	27	26	26	28	29	29	27	27	26	26	26	28	29	29	27	27	27	26	25	27
Feels °C (?)	34	34	33	32	32	30	30	30	30	30	28	28	27	26	26	28	28	29	27	27	28	28	27	28

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 Kuminatu (light winds from the S at Katsuura 7 km from Kuminatu). 0.5m 8s swell from the ESE with a 0.2m 4s local chop from the SSW. 2 swells combining to make bigger set waves.
1 hour 24 minutes ago Kuminatu

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1 h 24 min ago

7 km/h

Clean

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