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 2 am Wednesday 17 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 26.4° C
(Which is slightly warmer than usual)

How big are the waves at Amatu today?

The current surf forecast for Amatu at 8AM is: 0.7m 9s primary swell from a East-southeast direction and 0.3m 4s secondary swell from a East-southeast direction, 0.6m 4s secondary swell from a Southwest direction (forecast issued at 02:00am September 17). The wind direction is predicted to be cross-shore.

Time (JST) & Date	Wave Height	Wave Period
Morning (17 Sep)	2.5ft (0.7m)	10s
Afternoon (17 Sep)	2ft (0.6m)	9s
Evening (17 Sep)	3.5ft (1.0m)	5s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Wednesday 17								Thursday 18								Friday 19
	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)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	1	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	ESE	ESE	ESE	ESE	ESE	ESE	E	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	NE	NE	ENE	ENE	ENE	ENE	ENE
Period(s) (?)	9	9	9	10	10	9	9	5	5	6	6	6	6	6	7	7	6	7	7	7	6	6	6	6
Wave Graph (?)
kJ (?)	68	68	68	81	72	59	56	47	72	89	99	146	217	280	298	168	61	237	276	205	170	165	160	155
Wind (km/h)	SSW	SSW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	WSW	NE	NE	NE	NE	NNE	NE	NE	NE	NE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- on	cross- on	cross- on	cross	cross	cross- on	cross- on	cross- on	cross	cross	cross	cross	cross	cross	cross	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)	9:56PM 1.29						3:26PM 1.32			12:56AM 1.29					3:39PM 1.38			2:15AM 1.38					3:57PM 1.43
Low Tide / height (m)				7:14AM 0.39				8:33PM 1.13				8:19AM 0.35					9:07PM 0.98				9:06AM 0.32

	Wednesday 17								Thursday 18								Friday 19
Sunrise	-	-	5:22	-	-	-	-	-	-	-	5:22	-	-	-	-	-	-	-	5:24	-	-	-	-	-
Sunset	-	-	-	-	-	5:44	-	-	-	-	-	-	-	5:43	-	-	-	-	-	-	-	5:40	-	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1	1	1	-	-	-	-	1	2
Temp. °C	26	26	26	28	29	29	27	27	27	27	27	29	29	29	27	23	23	22	20	21	23	23	22	21
Feels °C (?)	30	29	29	30	31	31	29	29	29	29	28	29	28	28	30	21	22	20	18	19	21	21	20	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 The wind is still cross-on at Amatu (light winds from the SSW at Katsuura 11 km from Amatu). 0.6m 8s swell from the ESE with a 0.6m 3s local chop from the SSW and a 0.3m 4s local chop from the E as well as a 0.2m 12s groundswell, also from the E. 4 swells combining to make bigger set waves.
1 hour 7 minutes ago Amatu

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1 h 7 min ago

13 km/h

SSW

Cross-On

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