Monabe Rivermouth Surf Break

Monabe Rivermouth Surf Forecast and Surf Report

Lat Long: 33.52° N 133.78° E

Issued: 8 am 04 Jul 2026 (local time)

Forecast update in  hr  min

Today's Monabe Rivermouth sea temperature is
25.0° C

Normal for this time of year

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 4 Jul 2026:

  • Best quality surf: Friday 10 Jul, 3AM (local time) - 15ft (4.5m), 17s period, S swell with cross-offshore winds.
  • Most powerful swell: Friday 10 Jul, 6PM (local time) - 16ft (5.0m), 18s period, S swell with 16,033 kJ wave energy.
  • Next surfable swell (1★+): Monday 6 Jul, 6PM (local time) - 3ft (0.9m), 14s period with SE 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 06) at 6PM. The primary swell is predicted to be 0.9m and 14s period. 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 5.0m 18s and forecast to arrive on Friday (Jul 10) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.0m 17s period and expected on Saturday (Jul 11) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Mon 6th Jul)3ft (0.9m) 14s
Best Surf 3AM (Fri 10th Jul)15ft (4.5m) 17s
Most Powerful 6PM (Fri 10th Jul)16ft (5.0m) 18s

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


Updates in  hr  min  s Forecast update imminent

Righto, let's have a look at what's on the cards for Monabe Rivermouth. It's a tricky little river mouth setup that rarely breaks, so when it does, you gotta be on it. The water's sitting at 77°, pretty much where you'd expect for this time of year.

Truth be told, the next week and a half looks mostly frustrating. We've got a long quiet spell from now right through to the end of Saturday the 6th of July. The swell that's around is tiny – 1.0ft to 2ft – and mostly from the ESE or SE with weak energy (30 to 168). There's a moment on Sunday morning the 5th with 1ft SE swell at 11 seconds (62 combined energy) and glassy conditions, but it's just too small to get excited about. Monday morning the 6th has 2ft, 16-second SE groundswell (168 energy) and glassy, but again, it's barely breaking.

Then things ramp up in a big way. Tuesday the 7th of July morning: the swell jumps to 3ft, but the period is a massive 18 seconds from the SE, and the combined energy is up at 1010 – that's moderate energy with very long-period groundswell. The wind is glassy. This is the first real standout. Long-period waves on a river mouth can be a bit straight, but if the banks are right, the sets will have real shape and power.

Wednesday the 8th of July morning is where it gets serious for the experienced crew. We're looking at 10ft of SE swell at 17 seconds, with glassy conditions and the combined energy roaring at 5040. That is strong wave energy. This is proper, heavy, expert-only territory. The river mouth will be handling a lot of water.

The absolute pick of the entire outlook is Friday the 10th of July morning. The swell hits 15ft from the S at 18 seconds, with glassy conditions and a massive 13289 combined energy – that's very strong wave energy. That is a massive, long-period south groundswell. For an experienced surfer who knows the river mouth's ins and outs, this could be an epic, heavy session. The afternoon has 16ft, but the wind goes onshore and questionable, so the morning glass-off is the window.

After that, the 11th sees nothing, then we're back to small, weak, and ordinary for the rest of the run. A few days of 1.0ft to 3ft junk from the 12th to the 19th of July, with poor surf conditions and weak energy (mostly under 100). Nothing worth paddling out for.

All in all, keep your eyes on the morning of Tuesday the 7th for a taste of quality, but the true standouts for the big dogs are the mornings of Wednesday the 8th and Friday the 10th of July. That Friday morning glass-off with the 15ft south groundswell is the one to circle on the calendar – promising, but with a long-range forecast so stay tuned.

Rusty.

Short Range Forecast

Moderate rain (total 19mm), heaviest on Sun afternoon. Warm (max 27°C on Mon morning, min 22°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Wed afternoon. Warm (max 27°C on Tue morning, min 24°C on Tue night). Wind will be generally light.

Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
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
1
2
2
3
4
3
4
3
2
4
5
3
5
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.3
ESE
9
0.3
ESE
9
0.3
ESE
9
0.4
SE
11
0.4
SE
9
0.4
SE
10
0.6
SE
16
0.7
SE
14
1.1
SE
13
0.9
SE
18
1.9
SE
17
2.5
SE
17
3
SE
17
3
SE
17
3
SSE
16
3.5
SSE
16
3.5
SSE
16
4
SSE
17
4.5
S
18
5
S
18
5
S
18
Wave Graph
Metric surfscale
Energy kJ
16
16
15
30
19
25
157
206
398
510
2117
3761
5040
6179
4312
6957
6988
8148
13289
15209
14634
Wind (km/h)
5
SE
0
SW
5
E
5
SE
15
SE
5
NE
0
NE
5
S
10
NNW
0
SSE
10
S
5
ESE
5
S
10
SSE
5
ENE
10
SE
15
SE
5
ENE
5
SE
10
SSE
5
NNE
Wind State
cross-on
glassy
glassy
glassy
cross-on
glassy
glassy
on
off
glassy
on
glassy
glassy
cross-on
cross-off
cross-on
cross-on
cross-off
glassy
on
off
High Tide
9:12PM1.66m
8:32AM1.60m
9:43PM1.66m
9:21AM1.52m
10:18PM1.64m
10:22AM1.43m
10:58PM1.62m
11:42AM1.36m
11:45PM1.60m
1:23PM1.36m
00:42AM1.59m
3:02PM1.45m
1:48AM1.61m
Low Tide
2:30PM0.30m
2:55AM0.84m
3:04PM0.40m
3:40AM0.80m
3:41PM0.52m
4:32AM0.75m
4:25PM0.67m
5:34AM0.68m
5:20PM0.83m
6:45AM0.58m
6:35PM0.98m
7:58AM0.45m
8:06PM1.07m
mod rain
light rain
part cloud
cloud
mod rain
rain showers
part cloud
thunderstorm
clear
clear
part cloud
part cloud
part cloud
rain showers
part cloud
clear
rain showers
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:58
4:58
5:00
5:00
5:01
5:01
5:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:17
7:17
7:17
7:17
7:17
7:16
7:16
 mm
6
2
8
2
1
1
2
Temp °C
23
24
24
24
24
24
27
27
25
27
26
24
26
26
25
27
27
24
26
26
24
Feels °C
26
28
28
28
27
28
31
31
29
30
29
28
29
29
29
29
29
27
29
28
28
Swell 1
Height (m)
Direction
Period (s)
0.3
SSW
5
0.3
ESE
9
0.8
SSW
6
0.9
SSW
6
0.7
SSW
6
0.6
E
5
0.8
SSW
6
0.7
SE
14
1.1
SE
13
1.1
SE
14
1.9
SE
17
2.5
SE
17
3
SE
17
3
SE
17
3
SSE
16
3.5
SSE
16
3.5
SSE
16
4
SSE
17
4.5
S
18
5
S
18
5
S
18
Energy kJ
5
16
49
66
33
17
51
206
398
500
2117
3761
5040
6179
4312
6957
6988
8148
13289
15209
14634
Swell 2
Height (m)
Direction
Period (s)
0.3
ESE
9
0.3
SSW
5
0.3
ESE
9
0.4
SE
11
0.4
SE
9
0.6
SSW
6
0.6
SE
16
0.7
SSW
6
0.8
SSW
6
0.9
SE
18
0.6
SSW
6
1.3
SSE
19
1.5
S
21
Energy kJ
16
5
15
30
19
24
157
31
47
510
22
1314
1980
Swell 3
Height (m)
Direction
Period (s)
0.2
ESE
12
0.2
ESE
12
0.2
SSE
9
0.3
ESE
9
0.2
S
8
0.4
SE
10
0.5
E
5
0.6
E
9
0.7
E
5
0.8
SW
6
0.5
E
7
Energy kJ
14
14
7
15
5
25
11
59
27
54
26
Wind waves
Height (m)
Direction
Period (s)
0.6
E
4
0.6
E
5
0.6
ESE
5
0.8
E
8
0.6
E
8
Energy kJ
12
17
18
84
42
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
2
2
1
2
4
3
4
7
4
8
4
4
5
9
5
Distance (km)
288
47
9
9
235
20
9
42
0
0
77
0
0
20
0
20
531
0
0
75
0
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
1
2
2
2
3
4
5
9
7
6
8
9
9
9
9
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
1
1
1
1
2
2
2
3
4
5
9
7
9
8
5
9
9
9
9
Header Global
Rating
(10 max)
7
5
5
5
9
7
7
5
8
7
5
6
9
8
9
8
5
5
5
4
9
  • 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 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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