Monabe Rivermouth Surf Forecast

/ Shikoku (17 surf breaks) /

Japan (129 surf breaks)

Surf Forecasts:

Monabe Rivermouth surfForecast / Shikoku / Japan

12 Day Weather and Surf, issued 2 pm Wednesday 17 Sep 2025 JST

Forecast update in hr min s Forecast update imminent

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

Today's Monabe Rivermouth sea temperature is 28.5° C
(Which is 1.8°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Monabe Rivermouth this week:

The surf forecast for Monabe Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 22) at 9PM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.8m and 11s. Another secondary swell of 0.6m and 11s is also forecast. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Monabe Rivermouth in the next 12 days are 3.0m 8s and forecast to arrive on Wednesday (Sep 24) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Monday (Sep 22) at 6PM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	9PM (Mon 22nd Sep)	5ft (1.5m) 8s
Best Surf	3AM (Tue 23rd Sep)	7ft (2.1m) 9s
Most Powerful	9PM (Wed 24th Sep)	10ft (3.0m) 8s

Table - best surf conditions forecast for Monabe Rivermouth over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Moderate rain (total 13mm), heaviest on Wed afternoon. Warm (max 29°C on Wed afternoon, min 24°C on Thu night). Wind will be generally light.											Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Sat afternoon. Warm (max 27°C on Sat afternoon, min 20°C on Sun night). Wind will be generally light.
	Wed 17		Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23
	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	2	0	1	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	ESE	E	ESE	SE	SE	SE	ESE	ESE	E	E	ENE	ESE	ESE	ESE	ESE	S	E	E	E	E	E
Period(s) (?)	8	9	10	10	10	9	10	9	9	9	7	9	11	9	10	11	8	9	9	9	7
Wave Graph (?)
kJ (?)	41	39	31	29	45	43	36	32	127	101	46	33	45	32	37	38	513	828	888	632	457
Wind (km/h)	SSW	NE	W	S	N	WNW	SW	N	SW	SSW	N	NNW	SSE	NE	N	SSW	NNE	E	ESE	NE	E
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	cross- off	glass	on	off	glass	glass	glass	glass	on	off	glass	on	cross- off	off	cross- on	cross- off	glass	cross- on	cross- off	cross
High Tide / height (m)	4:22PM 1.56	2:59AM 1.50		4:50PM 1.65		3:58AM 1.63	5:14PM 1.71		4:43AM 1.74	5:36PM 1.76		5:21AM 1.81	5:57PM 1.79		5:56AM 1.85		6:17PM 1.80	6:30AM 1.85		6:37PM 1.80	7:02AM 1.81
Low Tide / height (m)		9:53PM 1.08	9:56AM 0.34		10:29PM 0.92	10:38AM 0.29		10:59PM 0.76	11:12AM 0.27		11:27PM 0.62	11:42AM 0.29		11:54PM 0.49		12:09PM 0.35	12:21AM 0.40		12:35PM 0.43	12:47AM 0.33

	Wed 17		Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23
Sunrise	-	-	5:48	-	-	5:50	-	-	5:50	-	-	5:50	-	-	5:52	-	-	5:52	-	-	5:52
Sunset	6:08	-	-	6:07	-	-	6:07	-	-	6:05	-	-	6:04	-	-	6:02	-	-	6:00	-	-

Rain (mm)	3	-	-	3	3	2	2	-	-	3	-	-	-	3	-	-	-	-	-	-	-
Temp. °C	29	27	29	29	25	26	27	25	27	27	24	27	26	23	23	24	21	26	26	23	24
Feels °C (?)	34	33	32	34	28	31	32	29	31	31	27	28	28	24	25	25	21	26	25	24	23

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 10 km away suggest it is still onshore at Monabe Rivermouth (light winds from the S at Kochi Airport). 0.5m 6s windswell from the SSE with a 0.2m 10s swell from the ESE and a 0.1m 6s windswell from the SSE. 3 swells combining to make bigger set waves.
2 hours 27 minutes ago Monabe Rivermouth

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2 h 27 min ago

15 km/h

Onshore

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Information about the Monabe Rivermouth Surf forecast

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

Monabe Rivermouth is 11 km (7 miles) from the city of Aki. If you plan a holiday in Shikoku, look for hotels and other accommodation in Aki. Aki has rooms for a wide range of budgets as well as car hire and transport links.