Monabe Rivermouth Surf Break

Lat Long: 33.52° N 133.78° E

Monabe Rivermouth Surf Forecast and Surf Report

Issued: 8 am 03 Aug 2026 (local time)

Forecast update in  hr  min

Today's Monabe Rivermouth sea temperature is
29.2° C
1.7° 

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 3 Aug 2026:

  • Best quality surf: Friday 7 Aug, 12AM (local time) - 25ft (7.5m), 17s period, SE swell with cross-offshore winds.
  • Most powerful swell: Friday 7 Aug, 12AM (local time) - 25ft (7.5m), 17s period, SE swell with 32,983 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 4 Aug, 9AM (local time) - 10ft (3.0m), 16s period with ESE 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 Tuesday (Aug 04) at 9AM. The primary swell is predicted to be 3.0m and 16s period with a secondary swell of 2.2m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Monabe Rivermouth in the next 16 days are 7.5m 17s and forecast to arrive on Friday (Aug 07) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 16s period and expected on Saturday (Aug 08) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Tue 4th Aug)10ft (3.0m) 16s
Best Surf12AM (Fri 7th Aug)25ft (7.5m) 17s
Most Powerful12AM (Fri 7th Aug)25ft (7.5m) 17s

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


The Lowdown

G'day, Rusty here, and I've gotta tell you, the next 16 days are a wild ride, starting with a real bang then a long, frustrating lull. We're kicking off with a proper standout, but you'll need to be patient and pick your moments.

Right off the bat, Monday August 3rd, Monabe Rivermouth is the place to be. The water is a touch warmer than normal, sitting at 85°, and it's glassy. We've got a 5 ft swell rolling in from the ESE, with a very long 16-second period groundswell. The energy is pumping at 1389, and it's going to be clean. This is a rare treat, so if you can get down there Monday morning, do it. Keep in mind, this spot rarely breaks, so when it's on, it's on. Crowds are possible, but it'll be worth it.

The quality builds through the week. Tuesday afternoon the 4th sees it jump to 12 ft, still glassy and from the ESE with a 17-second period. That's a massive 8198 energy reading. Wednesday morning the 5th is the absolute peak for the whole period: 16 ft, glassy, 17-second ESE groundswell, and 13904 energy. But listen, this is big. Anything over 8 ft is only for experts, and 16 ft is serious. This is a ripper, but it's a heavy, heavy wave. The river mouth setup will handle the long period, but it's not for the faint-hearted.

By Thursday the 6th, the swell is up to 23 ft from the SE, still with a 17-second period. The energy is off the charts at 30297. But the wind swings to a cross-offshore and then a cross-shore, and it's blowing 18-19 mph. This setup is looking more interesting for kite surfing than paddle surfing. The sheer size and wind will make it a mess for a standard board.

Then it all goes south. From Friday the 7th, the wind is onshore and the swell drops. There's a massive gap from Saturday the 8th all the way through to Sunday the 16th of August where conditions are just ordinary. You'll see some small waves, but the wind is either cross, cross-on, or the period drops to 8-9 seconds, making it weak and choppy. The energy readings are below 1000, and it's just not worth paddling out.

There is a tiny glimmer on Monday the 17th of August. The wind goes glassy again, and we get a 8 ft, 11-second E swell. That's a bit of a return to form with 1499 energy, but it's a long way off and not the same quality as that first week.

So, to sum it up: the first few days, especially Monday morning, Tuesday afternoon, and Wednesday morning, are the real deal. After that, you're on the beach for a solid week and a half. It's a classic case of a short, sharp hit of glory, then a long wait.

Rusty.

Short Range Forecast

Light rain (total 9mm), mostly falling on Mon afternoon. Warm (max 32°C on Wed afternoon, min 25°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 11mm), heaviest on Sat afternoon. Warm (max 33°C on Thu morning, min 25°C on Sat night). Mainly fresh winds.

Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
2
4
4
4
5
2
5
5
5
!
5
2
4
2
0
0
0
0
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
ESE
16
1.8
ESE
16
2.2
ESE
17
3
ESE
16
3.5
ESE
17
4
ESE
17
5
ESE
17
5.5
ESE
17
6
SE
16
6.5
SE
17
7
SE
17
7.5
SE
17
7
SSE
16
5
S
16
5.5
S
15
3
ESE
10
3
ESE
9
3
ESE
9
3
ESE
9
3
ESE
9
2.3
ESE
9
Wave Graph
Metric surfscale
Energy kJ
1464
1697
2895
5319
7686
9553
13580
17495
19640
25574
28435
32983
23383
11796
13062
1677
1583
1638
1713
1530
757
Wind (km/h)
5
SW
15
SE
10
E
5
SE
5
SSE
5
NE
0
SE
20
SE
10
NE
20
E
30
ESE
20
ENE
25
E
30
E
20
ENE
15
E
25
E
15
E
20
E
25
ESE
10
ENE
Wind State
glassy
cross-on
cross
glassy
glassy
glassy
glassy
cross-on
cross-off
cross
cross
cross-off
cross-off
cross
cross-off
cross-off
cross
cross
cross
cross
cross-off
High Tide
8:54PM1.75m
9:05AM1.58m
9:23PM1.72m
10:00AM1.47m
9:57PM1.67m
11:18AM1.36m
10:41PM1.60m
1:19PM1.32m
11:46PM1.54m
3:23PM1.42m
1:20AM1.53m
4:31PM1.57m
2:49AM1.60m
Low Tide
2:33PM0.43m
3:05AM0.57m
3:05PM0.59m
3:51AM0.55m
3:42PM0.77m
4:49AM0.54m
4:29PM0.96m
6:05AM0.52m
5:47PM1.13m
7:38AM0.45m
8:01PM1.21m
9:02AM0.31m
9:40PM1.16m
clear
thunderstorm
thunderstorm
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
rain showers
thunderstorm
thunderstorm
rain showers
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:18
5:18
5:20
5:20
5:20
5:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:02
7:01
7:01
7:00
7:00
6:59
6:58
 mm
4
5
1
4
5
1
Temp °C
31
30
28
27
27
26
31
32
28
33
33
29
32
32
28
28
27
27
30
30
25
Feels °C
35
34
33
32
32
30
33
32
31
32
32
29
31
31
29
30
28
28
29
29
26
  • 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
How to use the Wavefinder 
submit an eyeball surf report

Quick surf report for Monabe Rivermouth:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

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 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.

Nearest locationNearest