Monabe Rivermouth surfForecast / Shikoku / Japan

information circle12 Day Weather and Surf, issued 8 pm Tuesday 16 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
28.3° C
(Which is 1.5°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 Saturday (Sep 20) at 3AM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.2m and 9s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Monabe Rivermouth in the next 12 days are 1.7m 13s and forecast to arrive on Monday (Sep 22) at 3PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Monday (Sep 22) at 3PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sat 20th Sep)4.5ft (1.3m) 9s
Best Surf12PM (Mon 22nd Sep)5ft (1.5m) 14s
Most Powerful 3PM (Mon 22nd Sep)5.5ft (1.7m) 13s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 25mm), heaviest during Thu afternoon. Warm (max 29°C on Wed morning, min 23°C on Thu night). Wind will be generally light.

Days 3-6 Weather Summary Moderate rain (total 10mm), heaviest on Sat afternoon. Warm (max 27°C on Sat afternoon, min 22°C on Sun night). Wind will be generally light.

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tue
23
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
2
2
1
2
Swell
Height Map
Wave Height (m) & direction (?)
0.6
ESE
0.6
ESE
0.5
ESE
0.5
E
0.5
E
0.4
SE
0.5
SE
0.5
SE
0.4
SE
0.7
E
1.2
E
1.1
E
0.7
E
0.9
E
0.5
S
0.8
SSE
1.1
SSE
1.7
S
1.8
S
1.6
S
1.6
S
Period(s) (?)9989910109109997910111313121010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)545341394335454323742251895412747156424957851545522
Wind
(km/h)
5
NNE
5
WSW
10
SSW
10
NE
5
NW
10
SE
5
N
0
SSW
5
SW
5
ENE
0
NNW
5
WSW
5
N
5
N
5
SSW
10
N
5
N
5
SW
10
N
5
NNE
5
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glassglassoncross-
off
glasscross-
on
offglassglassglassglassglassoffglasscross-
on
offoffglassoffoffglass
High Tide
/ height (m)
1:21AM
1.40
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
Low Tide
/ height (m)
8:59AM
0.43
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
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tue
23
Sunrise-5:48--5:48--5:50--5:50--5:50--5:52--5:52-
Sunset--6:08--6:07--6:07--6:05--6:04--6:02--6:00
clear
clear
thunderstorm
thunderstorm
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
thunderstorm
thunderstorm
thunderstorm
part cloud
rain showers
part cloud
cloud
cloud
cloud
cloud
cloud
Rain (mm)
--16-5634-243-1------
Temp. °C272929272929262626252627242625232627222523
Feels °C (?)323334323333303030293032272928252829212525
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Shikoku

  1. weather stationWind Update Continuing clean conditions at Monabe Rivermouth (light winds from the N at Kochi Airport 10 km from Monabe Rivermouth). 0.5m 9s swell from the ESE with a 0.2m 9s swell from the SE. 2 swells combining to make bigger set waves.

    Monabe Rivermouth
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1 h 35 min ago

9 km/h
N
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 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.

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