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Surf Forecasts:

Monabe Rivermouth surfForecast / Shikoku / Japan

information circle12 Day Weather and Surf, issued 8 pm Tuesday 13 Jan 2026 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
17.2° C
 (Which is 1.1°C colder than average 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 Tuesday (Jan 20) at 9AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.6m and 7s. 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 0.9m 10s and forecast to arrive on Wednesday (Jan 21) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Thursday (Jan 15) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Tue 20th Jan)3ft (0.9m) 10s
Best Surf 9AM (Tue 20th Jan)3ft (0.9m) 10s
Most Powerful 3AM (Wed 21st Jan)3ft (0.9m) 10s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 18°C on Fri afternoon, min 3°C on Tue night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Very mild (max 16°C on Mon afternoon, min 9°C on Fri night). Wind will be generally light.

Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tue
20
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.1
E
0.1
E
0.1
E
0.2
E
0.2
ESE
1.1
SW
0.3
ESE
0.9
WSW
0.3
ESE
0.3
ESE
0.3
ESE
0.3
ESE
0.3
ESE
0.3
ESE
0.4
SE
0.4
ESE
0.5
SE
0.6
SE
0.8
SE
0.9
SE
0.8
SE
Period(s) (?)1010121110596991010101010988101010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)22391049174317171820202025323254110160138
Wind
(km/h)
10
NNW
10
NW
5
WNW
10
N
5
N
5
SW
10
NW
10
N
5
WNW
10
NNE
5
N
10
SSE
10
NNE
5
NNE
5
SSW
5
NE
5
NNW
5
SW
15
NNW
15
NNW
15
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off		glassoffglasscross-
on		cross-
off		offcross-
off		offoffonoffglassoncross-
off		glasscross-
on		offoffcross-
off
High Tide
/ height (m)
4:19AM
1.36
2:10PM
1.45
5:04AM
1.47
3:13PM
1.50
5:38AM
1.56
4:04PM
1.57
6:07AM
1.63
4:47PM
1.65
6:36AM
1.69
5:26PM
1.73
7:03AM
1.74
6:03PM
1.79
7:30AM
1.77
Low Tide
/ height (m)
8:54AM
1.18
9:43PM
0.48
10:06AM
1.15
10:28PM
0.37
10:51AM
1.09
11:07PM
0.26
11:27AM
1.03
11:43PM
0.17
11:59AM
0.96
12:16AM
0.11
12:30PM
0.90
12:48AM
0.08
1:01PM
0.83
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tue
20
Sunrise-7:09--7:09--7:07--7:07--7:07--7:07--7:07-
Sunset--5:17--5:17--5:19--5:20--5:21--5:22--5:22
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
part cloud
part cloud
Rain (mm)
---------------------
Temp. °C891161213111618101515111414111516131010
Feels °C (?)3481910812146121291212913151065
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

View detailed surf forecast for Monabe Rivermouth at:
surf-forecast.com

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.

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