Sagami River Surf Forecast

/ Kanagawa (21 surf breaks) /

Japan (129 surf breaks) / Lat Long: (35.31° N 139.36° E)

Surf Forecasts:

Sagami River surfForecast / Kanagawa / Japan

12 Day Weather and Surf, issued 2 am Thursday 21 Aug 2025 JST

Forecast update in hr min s Forecast update imminent

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

Today's Sagami River sea temperature is 27.3° C
(Which is normal for this time of year)

Best Forecast Surf Conditions for Sagami River this week:

The surf forecast for Sagami River over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 27) at 3AM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 0.9m and 6s. Another secondary swell of 0.1m and 10s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Sagami River in the next 12 days are 1.3m 5s and forecast to arrive on Tuesday (Aug 26) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	3AM (Wed 27th Aug)	3.5ft (1.1m) 6s
Best Surf	3AM (Wed 27th Aug)	3.5ft (1.1m) 6s
Most Powerful	6PM (Tue 26th Aug)	4.5ft (1.3m) 5s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Light rain (total 2mm), mostly falling on Thu night. Warm (max 31°C on Sat afternoon, min 27°C on Fri night). Wind will be generally light.									Days 3-6 Weather Summary Some drizzle, heaviest during Tue night. Warm (max 32°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light.
	Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26			Wednesday 27
	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	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SSW	SSW	SSW	SW	SSW	SSW	SSW	SSW	SSW	SW	SSW	SSW	SW	ESE	SSW	SSW	SSW	SSW	SSW	S	SSW
Period(s) (?)	5	6	6	7	6	6	6	3	4	4	4	4	4	9	4	4	5	5	6	6	4
Wave Graph (?)
Energy (?)	14	20	17	15	23	12	9	8	22	21	18	16	18	19	27	18	99	70	26	33	10
Wind (km/h)	SE	SSW	N	ENE	S	SSW	SSE	S	WSW	WSW	S	W	E	S	SW	SSW	SSW	SW	NE	SSW	ENE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	glass	cross- on	cross- off	cross	cross- on	glass	on	cross- on	cross	cross	cross- on	cross- off	cross- on	cross- on	cross	cross- on	cross- on	cross	glass	cross- on	glass
High Tide / height (m)		4:54PM 1.39		3:10AM 1.43	5:14PM 1.42		4:00AM 1.49	5:34PM 1.44		4:43AM 1.51	5:53PM 1.45		5:23AM 1.51		6:11PM 1.46	6:02AM 1.47		6:28PM 1.46	6:39AM 1.40		6:45PM 1.46
Low Tide / height (m)	9:36AM 0.15		9:58PM 0.97	10:17AM 0.12		10:31PM 0.85	10:52AM 0.14		11:02PM 0.73	11:23AM 0.19		11:33PM 0.62	11:50AM 0.28		12:04AM 0.53		12:15PM 0.39	12:35AM 0.46		12:38PM 0.52	1:07AM 0.43

	Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26			Wednesday 27
Sunrise	5:05	-	-	5:05	-	-	5:07	-	-	5:07	-	-	5:07	-	-	5:09	-	-	5:09	-	-
Sunset	-	6:24	-	-	6:23	-	-	6:22	-	-	6:21	-	-	6:20	-	-	6:17	-	-	6:16	-

Rain (mm)	-	-	2	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1	-	1	-
Temp. °C	30	30	28	30	30	28	30	31	28	31	32	29	30	30	28	31	31	28	30	31	28
Feels °C (?)	34	33	33	33	32	32	33	34	30	32	34	32	32	32	30	32	31	33	33	33	32

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 Kanagawa

Wind Update Continuing clean conditions at Sagami River (calm at Mubeyama wx 13 km from Sagami River). 0.4m 5s windswell from the SSW with a 0.3m 8s swell, also from the SSW and a 0.1m 10s swell, also from the SE. 3 swells combining to make bigger set waves.
1 hour 13 minutes ago Sagami River

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1 h 13 min ago

0 km/h

WNW

Clean

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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 Sagami River 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 Sagami River Surf forecast

The above surf forecast table for Sagami River provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Sagami River can be found by selecting the local surf guide option on the grey menu. Our Sagami River 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 (Sagami River) 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 Sagami River 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.

Sagami River is 4 km (2 miles) from the city of Chigasaki. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Chigasaki. Chigasaki has rooms for a wide range of budgets as well as car hire and transport links.