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 Thursday 23 Oct 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 27.5° C
(Which is 3.7°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 Thursday (Oct 23) at 9PM. The primary swell is predicted to be 2.4m and 10s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Monabe Rivermouth in the next 12 days are 2.4m 10s and forecast to arrive on Thursday (Oct 23) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Thursday (Oct 23) at 9PM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	9PM (Thu 23rd Oct)	8ft (2.4m) 10s
Best Surf	9PM (Thu 23rd Oct)	8ft (2.4m) 10s
Most Powerful	9PM (Thu 23rd Oct)	8ft (2.4m) 10s

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 Light rain (total 8mm), mostly falling on Sun morning. Warm (max 22°C on Sat morning, min 16°C on Thu night). Wind will be generally light.											Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Sun afternoon. Warm (max 23°C on Sun afternoon, min 9°C on Tue night). Wind will be generally light.
	Thu 23		Friday 24			Saturday 25			Sunday 26			Monday 27			Tuesday 28			Wednesday 29
	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM
Rating (10 max)	1	2	1	2	2	2	2	1	1	1	1	1	0	1	0	1	0	0	0	0	1
Swell Height Map See all maps
Wave Height (m) & direction (?)	E	E	E	E	E	E	E	ESE	ESE	ESE	ESE	ESE	ESE	E	E	E	E	E	E	E	E
Period(s) (?)	11	10	10	10	9	9	9	9	8	9	9	10	10	10	11	11	10	10	10	10	10
Wave Graph (?)
kJ (?)	1525	1112	770	809	1148	800	996	682	500	419	528	616	523	267	269	231	130	71	70	186	643
Wind (km/h)	SSW	NNE	NNW	SW	NNE	NNE	NE	NNE	NW	WNW	N	NNW	NNW	NNW	NNW	NNW	N	N	S	N	NNE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	cross- off	off	glass	cross- off	glass	cross- off	off	glass	glass	off	off	cross- off	off	cross- off	off	off	off	on	off	glass
High Tide / height (m)		6:13PM 1.76	7:21AM 1.73		6:36PM 1.73	7:55AM 1.64		6:59PM 1.69	8:32AM 1.54		7:23PM 1.63	9:18AM 1.44		7:51PM 1.55	10:25AM 1.36		8:28PM 1.46		12:08PM 1.34	9:36PM 1.35
Low Tide / height (m)		12:46AM 0.20		12:56PM 0.82	1:15AM 0.23		1:21PM 0.90	1:47AM 0.30		1:47PM 0.99	2:24AM 0.39		2:17PM 1.07		3:09AM 0.49	3:00PM 1.15		4:12AM 0.59	4:42PM 1.21		5:42AM 0.64

	Thu 23		Friday 24			Saturday 25			Sunday 26			Monday 27			Tuesday 28			Wednesday 29
Sunrise	-	-	6:15	-	-	6:16	-	-	6:16	-	-	6:18	-	-	6:18	-	-	6:20	-	-	6:20
Sunset	5:22	-	-	5:21	-	-	5:20	-	-	5:19	-	-	5:17	-	-	5:16	-	-	5:15	-	-

Rain (mm)	-	-	-	-	-	-	-	3	5	3	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	21	17	20	21	17	22	22	20	22	23	20	22	22	16	17	16	12	17	17	16	18
Feels °C (?)	20	16	19	21	16	23	23	21	25	26	21	19	19	13	12	10	7	15	15	14	18

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 The wind is still cross-on at Monabe Rivermouth (light winds from the SW at Kochi Airport 10 km from Monabe Rivermouth). 3.1m 10s swell from the E with a 2.3m 10s swell from the ESE. 2 swells combining so expect closeout sets.
2 hours 14 minutes ago Monabe Rivermouth

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2 h 14 min ago

13 km/h

Cross-On

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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 Monabe Rivermouth 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 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.