Monabe Rivermouth surfForecast / Shikoku / Japan

information circle12 Day Weather and Surf, issued 2 am Sunday 07 Dec 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
21.4° C
(Which is slightly warmer than usual)


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 (Dec 13) at 6AM. The primary swell is predicted to be 1.6m and 6s period with a secondary swell of 0.9m and 6s. Another secondary swell of 0.5m and 10s 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 1.6m 6s and forecast to arrive on Saturday (Dec 13) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Friday (Dec 12) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Sat 13th Dec)5ft (1.6m) 6s
Best Surf 6AM (Sat 13th Dec)5ft (1.6m) 6s
Most Powerful 6AM (Sat 13th Dec)5ft (1.6m) 6s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 17°C on Mon morning, min 6°C on Mon night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Very mild (max 14°C on Thu morning, min 2°C on Fri night). Wind will be generally light.

Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.4
ESE
0.4
ESE
0.4
ESE
0.4
ESE
0.4
ESE
0.4
ESE
0.6
ESE
0.6
ESE
0.5
ESE
0.5
ESE
0.6
ESE
0.6
ESE
0.7
ESE
0.7
ESE
0.7
ESE
0.7
ESE
0.7
NE
0.6
E
1.6
NE
0.4
ESE
0.6
E
Period(s) (?)9899999999910101010971061110
Wave
Graph
(?)Metric surfscale
Energy kJ (?)312829313232525244476972100100968844681963771
Wind
(km/h)
5
N
5
SSW
5
N
5
NNW
20
N
15
N
10
N
5
SW
10
N
5
NNW
5
SSW
10
NNE
5
N
5
WNW
10
NNW
20
N
25
NNW
15
NNE
5
N
10
SSE
10
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glassglassoffglassoffoffoffglassoffoffonoffglassglasscross-
off
offoffoffoffonoff
High Tide
/ height (m)
6:48PM
1.84
8:47AM
1.75
7:34PM
1.76
9:36AM
1.66
8:24PM
1.65
10:26AM
1.58
9:22PM
1.51
11:17AM
1.53
10:36PM
1.38
12:08PM
1.50
12:13AM
1.30
12:58PM
1.49
1:55AM
1.30
Low Tide
/ height (m)
1:21PM
0.97
1:47AM
-0.03
2:07PM
1.00
2:35AM
0.11
2:57PM
1.01
3:24AM
0.29
3:57PM
1.01
4:15AM
0.48
5:10PM
0.97
5:12AM
0.66
6:31PM
0.89
6:16AM
0.81
7:43PM
0.77
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunrise6:54--6:54--6:56--6:56--6:58--6:58--6:58--
Sunset-4:55--4:55--4:55--4:57--4:57--4:57--4:57-
clear
clear
clear
part cloud
cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
cloud
cloud
clear
clear
clear
clear
clear
clear
part cloud
Rain (mm)
---------------------
Temp. °C131411171691314812139141412111049109
Feels °C (?)101191511410113910511121043-2666
  • 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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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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