Niyodo Rivermouth Surf Forecast

/ Shikoku (17 surf breaks) /

Japan (129 surf breaks)

Surf Forecasts:

Niyodo Rivermouth surfForecast / Shikoku / Japan

12 Day Weather and Surf, issued 8 am Wednesday 20 Aug 2025 JST

Forecast update in hr min s Forecast update imminent

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

Today's Niyodo Rivermouth sea temperature is 29.2° C
(Which is 1.5°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Niyodo Rivermouth this week:

The surf forecast for Niyodo Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 20) at 6PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.3m and 11s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Niyodo Rivermouth in the next 12 days are 0.8m 8s and forecast to arrive on Thursday (Aug 21) at 3AM. Winds are predicted to be glassy at the time the swell arrives.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	6PM (Wed 20th Aug)	2.5ft (0.8m) 8s
Best Surf	6PM (Wed 20th Aug)	2.5ft (0.8m) 8s
Most Powerful	3AM (Thu 21st Aug)	2.5ft (0.8m) 8s

Table - best surf conditions forecast for Niyodo Rivermouth 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 Wed afternoon. Warm (max 30°C on Wed morning, min 25°C on Wed night). Wind will be generally light.									Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Sun afternoon. Warm (max 30°C on Sat morning, min 25°C on Mon night). Wind will be generally light.
	Wednesday 20			Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	1	0	1	1	0	1	1	0	1	1	0	1	0	0	0	0	0	0	0	0	1
Swell Height Map See all maps
Wave Height (m) & direction (?)	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SE	SSW	SSW	ESE	ESE	ESE	ESE	ESE	ESE	ESE	ESE	SSW	SSW	SW
Period(s) (?)	8	8	8	8	7	7	6	10	5	6	9	9	8	8	8	8	8	9	5	5	4
Wave Graph (?)
Energy (?)	109	98	67	88	106	82	54	47	51	65	53	54	34	36	32	32	28	33	44	34	71
Wind (km/h)	SW	SSW	NE	S	SSW	NNE	SSW	S	NE	S	SSW	NNE	SSW	SSE	NNE	SSW	SSW	NE	S	S	NNE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	glass	cross- on	glass	glass	on	cross- off	glass	on	cross- off	glass	on	glass	glass	cross- on	glass	glass	on	cross- off	glass	on	off
High Tide / height (m)		5:16PM 1.65		3:54AM 1.63	5:47PM 1.72		4:46AM 1.74		6:15PM 1.77	5:29AM 1.82		6:40PM 1.80	6:09AM 1.86		7:04PM 1.80	6:45AM 1.85		7:26PM 1.80	7:21AM 1.80		7:47PM 1.77
Low Tide / height (m)	10:04AM 0.25		10:39PM 1.06	10:52AM 0.16		11:17PM 0.93	11:32AM 0.11		11:50PM 0.81		12:07PM 0.11	12:21AM 0.69		12:39PM 0.16	12:51AM 0.60		1:07PM 0.25	1:21AM 0.53		1:34PM 0.37	1:51AM 0.49

	Wednesday 20			Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26
Sunrise	5:30	-	-	5:30	-	-	5:31	-	-	5:31	-	-	5:33	-	-	5:33	-	-	5:33	-	-
Sunset	-	6:45	-	-	6:45	-	-	6:44	-	-	6:43	-	-	6:42	-	-	6:39	-	-	6:38	-

Rain (mm)	-	2	-	-	-	-	-	-	-	-	-	-	1	3	1	-	-	-	-	2	6
Temp. °C	30	29	27	29	29	27	29	29	26	30	29	27	30	30	27	30	30	27	29	29	27
Feels °C (?)	34	33	33	33	33	33	32	32	31	33	32	32	34	34	32	34	34	33	33	33	33

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 Shikoku

Wind Update Wind reports 3 km away suggest it is still onshore at Niyodo Rivermouth (light winds from the S at Kochi Airport). 0.4m 8s swell from the S with a 0.3m 8s swell from the ESE and a 0.2m 13s groundswell, also from the ESE. 3 swells combining to make bigger set waves.
2 hours 1 minute ago Niyodo Rivermouth

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2 h 1 min ago

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Information about the Niyodo Rivermouth Surf forecast

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

Niyodo Rivermouth is 15 km (9 miles) from Kochi. If you plan a holiday in Shikoku, look for hotels and other accommodation in Kochi. Kochi has rooms for a wide range of budgets as well as car hire and transport links.