Monabe Rivermouth Surf Break

Lat Long: 33.52° N 133.78° E

Monabe Rivermouth Surf Forecast and Surf Report

Issued: 8 pm 17 Sep 2026 (local time)

Forecast update in  hr  min

Today's Monabe Rivermouth sea temperature is
28.5°C
1.8° 

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


Monabe Rivermouth surf forecast from 17 Sep 2026:

  • Best quality surf: Saturday 19 Sep, 3PM (local time) - 11ft (3.5m), 15s period, ESE swell with glassy winds.
  • Most powerful swell: Saturday 19 Sep, 3PM (local time) - 11ft (3.5m), 15s period, ESE swell with 5,855 kJ wave energy.
  • Next surfable swell (1★+): Friday 18 Sep, 3AM (local time) - 6.5ft (2.0m), 8s period with E swell.

Best Forecast Surf Conditions for Monabe Rivermouth this week:

The surf forecast for Monabe Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 18) at 3AM. The primary swell is predicted to be 2.0m and 8s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Monabe Rivermouth in the next 16 days are 3.5m 15s and forecast to arrive on Saturday (Sep 19) 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 0.8m 4s period and expected on Monday (Sep 21) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Fri 18th Sep)6.5ft (2.0m) 8s
Best Surf 3PM (Sat 19th Sep)11ft (3.5m) 15s
Most Powerful 3PM (Sat 19th Sep)11ft (3.5m) 15s

Table - best surf conditions forecast for Monabe Rivermouth over the next 16 days.


Short Range Forecast

Some drizzle, heaviest during Sat afternoon. Warm (max 30°C on Sun morning, min 22°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 28°C on Mon afternoon, min 19°C on Mon night). Wind will be generally light.

Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wednesday
23
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
1
3
4
3
3
2
3
2
1
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
E
8
2.2
E
9
2.3
E
10
2
E
10
1.6
ESE
13
3.5
ESE
15
3.5
ESE
13
3.5
ESE
12
3
ESE
12
3.5
ESE
13
2.1
ESE
12
1.1
E
11
0.7
E
10
0.5
E
9
0.5
E
9
0.4
E
8
0.6
E
8
0.6
E
8
1
E
8
Wave Graph
Metric surfscale
Energy kJ
407
783
964
767
902
5855
3991
3407
2918
3775
1310
295
98
41
41
22
41
40
124
Wind (km/h)
5
NE
0
W
10
SE
10
N
0
NNW
5
SSW
10
N
15
NNW
25
NNW
20
NNW
25
NNW
25
NNW
15
N
5
NNW
10
S
5
NNE
5
W
10
S
5
NNE
Wind State
cross-off
glassy
cross-on
off
glassy
glassy
off
off
cross-off
off
off
off
off
off
on
off
glassy
on
off
High Tide
10:36AM1.27m
8:52PM1.49m
9:22PM1.39m
4:06PM1.33m
00:05AM1.30m
4:10PM1.43m
2:22AM1.37m
4:26PM1.53m
3:23AM1.49m
4:45PM1.62m
Low Tide
3:41AM0.56m
2:51PM1.11m
4:47AM0.66m
6:47AM0.71m
8:43PM1.27m
8:31AM0.64m
9:35PM1.14m
9:26AM0.53m
10:02PM1.00m
10:04AM0.43m
10:28PM0.84m
clear
part cloud
part cloud
clear
clear
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:48
5:50
5:50
5:50
5:52
5:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:08
6:07
6:07
6:05
6:04
6:02
6:00
 mm
1
Temp °C
24
26
27
24
28
27
24
30
29
23
27
28
20
26
25
22
26
26
22
Feels °C
27
28
29
27
30
31
27
30
28
22
24
25
19
26
26
23
27
27
24
  • Map Icons:
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  • 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 16 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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