Monabe Rivermouth Surf Break

Lat Long: 33.52° N 133.78° E

Monabe Rivermouth Surf Forecast and Surf Report

Issued: 8 am 27 Jul 2026 (local time)

Forecast update in  hr  min

Today's Monabe Rivermouth sea temperature is
29.3° C
2.1° 

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 27 Jul 2026:

  • Best quality surf: Monday 27 Jul, 6PM (local time) - 2.5ft (0.7m), 9s period, S swell with glassy winds.
  • Most powerful swell: Monday 3 Aug, 3PM (local time) - 5ft (1.6m), 15s period, ESE swell with 1,147 kJ wave energy.
  • Next surfable swell (1★+): Monday 27 Jul, 6PM (local time) - 2.5ft (0.7m), 9s period with S 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 Monday (Jul 27) at 6PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.6m and 10s. Another secondary swell of 0.2m and 3s is also forecast. 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 1.6m 15s and forecast to arrive on Monday (Aug 03) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Jul 28) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Mon 27th Jul)2.5ft (0.7m) 9s
Best Surf 6PM (Mon 27th Jul)2.5ft (0.7m) 9s
Most Powerful 3PM (Mon 3rd Aug)5ft (1.6m) 15s

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


The Lowdown

Alright, this is Rusty. Let's have a look at what's on the table.

Alright, straight up, we're looking at a quiet start. For the first week, starting Monday, July 27th, through to the end of July and into the first couple of days of August, there's just nothing doing at Monabe Rivermouth. Tiny swell, poor conditions, and a lot of flat days. We're talking a solid 7 to 8 day gap with no real surf worth paddling out for, so don't bother waxing up just yet.

Now, things get interesting as we move into the second week. The whole pattern shifts on Monday, August 3rd, when a bigger, longer-period ESE groundswell starts showing up. It's a bit messy with cross-shore wind that morning, but the real standout window opens up Tuesday, August 4th. That morning, it's gonna be a full-on 8 ft of ESE swell with a very long 17 second period, and the wind is completely glassy – calm as a lake. The combined energy is pumping at 4018. This is proper groundswell, and for a setup like a river mouth, that long period is going to peel beautifully. It's big though, over 8 ft, so this one's for experienced surfers only. The water temperature is sitting at 85°, which is much warmer than normal for this time of year.

Wednesday morning, August 5th, is another cracker. Same 10 ft of ESE swell, same 17 second period, with a glassy southwesterly light air. The combined energy is even higher at 5733. That's another top-shelf session for the crew who know what they're doing.

Thursday, August 6th, is the final standout of that run. Morning sees an 12 ft ESE swell with an offshore breeze, but the afternoon shifts to a clean 12 ft easterly swell with a gentle offshore from the north – that's peak conditions for this spot. The energy readings are huge, in the 7000s. Again, this is expert-only territory. By Friday, August 7th, it drops off a bit and gets more marginal, and by the weekend it's fizzling out back into small, ordinary surf for the following Monday and Tuesday.

So, to wrap it up: the first week is a write-off, a total dud. The standout is undeniably the window from Tuesday, August 4th, through to Thursday, August 6th. That's when the big, clean groundswell hits with offshore or glassy winds. It's a short, powerful blast of proper surf, but it's for experts only. If you're not in that boat, you're waiting until the following week for some smaller, more manageable waves around Monday and Tuesday.

Stay salty.
Rusty.

Short Range Forecast

Mostly dry. Warm (max 32°C on Wed afternoon, min 27°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 33°C on Sat morning, min 27°C on Thu night). Wind will be generally light.

Monday
27
Tuesday
28
Wednesday
29
Thursday
30
Friday
31
Saturday
1
Sunday
2
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
SE
14
0.7
S
9
0.5
SE
10
0.5
SE
10
0.6
ESE
10
0.6
ESE
10
0.5
SE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
10
0.4
ESE
9
0.4
ESE
9
0.4
SE
9
0.4
SE
9
0.4
SE
9
0.4
SE
10
0.4
SE
10
0.3
SE
11
0.4
ESE
13
0.6
ESE
12
1.2
ESE
15
Wave Graph
Metric surfscale
Energy kJ
72
74
52
51
67
77
48
38
38
36
35
35
24
22
23
27
28
19
56
121
573
Wind (km/h)
5
S
10
S
5
N
5
SSW
10
SSW
5
NNW
5
WSW
5
WSW
10
N
5
WSW
10
S
5
N
5
SW
10
S
5
N
5
W
10
SSE
5
N
5
SSW
10
SSE
5
ENE
Wind State
glassy
on
off
glassy
on
cross-off
glassy
glassy
off
glassy
on
glassy
glassy
on
off
glassy
on
off
glassy
cross-on
glassy
High Tide
5:56PM1.60m
4:35AM1.62m
6:23PM1.66m
5:15AM1.70m
6:49PM1.71m
5:52AM1.76m
7:14PM1.74m
6:28AM1.79m
7:38PM1.76m
7:03AM1.79m
8:03PM1.77m
7:40AM1.75m
8:28PM1.77m
Low Tide
10:54AM0.31m
11:15PM1.04m
11:31AM0.23m
11:47PM0.96m
12:04PM0.17m
00:17AM0.88m
12:35PM0.14m
00:48AM0.81m
1:05PM0.16m
1:19AM0.73m
1:34PM0.21m
1:51AM0.67m
2:03PM0.30m
2:26AM0.61m
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:13
5:13
5:15
5:15
5:16
5:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:07
7:07
7:07
7:06
7:05
7:04
 mm
2
7
Temp °C
31
31
28
31
31
29
30
32
29
32
32
29
31
31
28
33
31
28
30
31
27
Feels °C
34
35
33
35
35
33
33
35
32
34
35
32
34
34
32
36
34
33
34
35
32
  • 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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