Amatu Surf Forecast

/ Chiba (19 surf breaks) /

Japan (129 surf breaks) / Lat Long: (35.12° N 140.19° E)

Surf Forecasts:

Amatu surfForecast / Chiba / Japan

48hr Weather and Surf, issued 8 pm Saturday 13 Sep 2025 JST

Forecast update in hr min s Forecast update imminent

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

Today's Amatu sea temperature is 27.1° C
(Which is 1.0°C warmer than normal for this time of year)

How big are the waves at Amatu today?

The current surf forecast for Amatu at 2AM is: 1.5m 6s primary swell from a Southwest direction and 0.3m 10s secondary swell from a East-southeast direction, 0.4m 8s secondary swell from a Northeast direction (forecast issued at 08:00pm September 13). The wind direction is predicted to be cross-onshore.

Time (JST) & Date	Wave Height	Wave Period
Morning (14 Sep)	6ft (1.9m)	7s
Afternoon (14 Sep)	5ft (1.6m)	7s
Evening (14 Sep)	5ft (1.5m)	7s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Sat 13		Sunday 14								Monday 15								Tuesday 16
	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	12 PM	3 PM
Rating (10 max)	0	0	0	0	0	0	0	0	0	2	1	1	0	0	0	0	1	1	1	1	1	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SE	SSW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SSW	E	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE
Period(s) (?)	11	5	5	6	6	7	7	7	7	7	6	6	6	14	10	10	10	10	10	9	9	9	9	9
Wave Graph (?)
kJ (?)	20	54	119	177	256	321	298	240	178	195	97	162	49	33	31	32	61	61	60	73	71	71	70	70
Wind (km/h)	SW	SW	SW	SW	SW	SW	WSW	SW	WSW	WSW	NNE	NE	NNE	NE	NE	ENE	NE	ENE	NE	NNE	NNE	ENE	ESE	SE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- on	cross- on	cross- on	cross- on	cross	cross	cross	cross	cross	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross	cross- off	cross- off	cross- off	glass	cross- off	cross	cross- on	on
High Tide / height (m)		7:13PM 1.54					10:12AM 1.15			7:38PM 1.48								8:10PM 1.39
Low Tide / height (m)				2:44AM 0.30				1:29PM 1.08					4:01AM 0.37								5:41AM 0.41

	Sat 13		Sunday 14								Monday 15								Tuesday 16
Sunrise	-	-	-	-	5:20	-	-	-	-	-	-	-	5:20	-	-	-	-	-	-	-	5:20	-	-	-
Sunset	-	-	-	-	-	-	-	5:49	-	-	-	-	-	-	-	5:46	-	-	-	-	-	-	-	5:45

Rain (mm)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1	-
Temp. °C	27	27	27	27	27	28	29	29	27	27	26	26	25	27	28	28	26	26	26	25	25	27	28	28
Feels °C (?)	28	27	26	26	26	28	30	31	30	32	31	28	27	28	30	30	29	30	30	29	29	30	31	31

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 Cross-on wind has become light (light winds from the SSW at Katsuura 11 km from Amatu). 1.6m 6s windswell from the SSW with a 0.6m 9s swell from the ENE. 2 swells combining to make bigger set waves.
58 minutes ago Amatu
Wind Update Cross-off wind 22 km from Tsurigasaki Surfing Beach (Tokyo 2020) has become light (light winds from the SSW at Katsuura). Waves should be turning clean at Tsurigasaki Surfing Beach (Tokyo 2020). 0.6m 10s swell from the ENE with a 0.2m 12s groundswell from the SE. 2 swells combining to make bigger set waves.
58 minutes ago Tsurigasaki Surfing Beach (Tokyo 2020)

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Actual: 58 min ago

9 km/h

SSW

Clean

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