Kaifu Rivermouth Surf Break

Kaifu Rivermouth Surf Forecast and Surf Report

Lat Long: 33.59° N 134.36° E

Issued: 2 am 06 Jul 2026 (local time)

Forecast update in  hr  min

Today's Kaifu Rivermouth sea temperature is
24.5° C

1.1°C colder than average for this time of year

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


Kaifu Rivermouth surf forecast from 5 Jul 2026:

  • Best quality surf: Saturday 11 Jul, 12AM (local time) - 13ft (4.0m), 18s period, S swell with glassy winds.
  • Most powerful swell: Friday 10 Jul, 9PM (local time) - 13ft (4.0m), 18s period, S swell with 10,661 kJ wave energy.
  • Next surfable swell (1★+): Monday 6 Jul, 3PM (local time) - 3ft (0.9m), 14s period with SE swell.

Best Forecast Surf Conditions for Kaifu Rivermouth this week:

The surf forecast for Kaifu Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jul 06) at 3PM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 0.2m and 7s. Another secondary swell of 0.4m and 6s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Kaifu Rivermouth in the next 16 days are 4.0m 18s and forecast to arrive on Friday (Jul 10) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Tuesday (Jul 07) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Mon 6th Jul)3ft (0.9m) 14s
Best Surf12AM (Sat 11th Jul)13ft (4.0m) 18s
Most Powerful 9PM (Fri 10th Jul)13ft (4.0m) 18s

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


Updates in  hr  min  s Forecast update imminent

Alright folks, Rusty here. Let’s have a look at what the sea’s got cooking for us at Kaifu Rivermouth over the next couple of weeks. It’s a bit of a slow burner, so don’t go paddling out just yet.

We’re staring down the barrel of a few days with nothing really worth mentioning to start. The first sniff of anything rideable doesn’t show up until Monday the 6th, but it’s poor. We’ve got a tiny 2ft SE windswell with a 15-second period and a cross-onshore breeze. The water’s a bit colder than normal for this time of year at 76°, sitting about 2° below average. The energy is weak (181), so honestly, just leave the board in the car. Monday afternoon gets glassy, but with only 3ft on offer, it’s still flat.

Tuesday the 7th sees a bump, but it’s messy. Tuesday morning brings 4ft SE swell with a 12-second period and a cross-on breeze. The energy is starting to build (654), but the forecast is marginal. Tuesday afternoon pushes 4ft SE swell with a 16-second period and offshore wind, but the energy jumps to 1005 – still not enough to get excited about, and the conditions are questionable. The real build kicks off Wednesday the 8th. Wednesday morning we’ve got 7ft of SE groundswell, period at 17 seconds, and offshore wind. This is where things get serious, with energy at 3935. The size is getting up there, over 8ft by Wednesday afternoon, pushing 10ft with the same long-period SE swell and energy hitting 5702. This is expert territory now, and with that 17-second period, it’s going to be a proper, powerful groundswell – best handled at a river mouth like this one.

Thursday the 9th holds onto that swell, with 10ft SSE early and 8ft later, still with offshore wind. The energy peaks at 6256 Thursday morning. Then Friday the 10th? That’s the standout. Friday afternoon is the real jewel: 13ft S swell, 17-second period, offshore wind, and an energy reading of 12517. That’s extreme energy for a river mouth. This is not for the faint of heart – experts only, and it’s going to be a beast. The swell direction is S which isn’t the optimum SE, but the sheer power will still produce.

Saturday the 11th and Sunday the 12th see the swell slowly dropping, from 13ft down to 12ft and then 8ft, but the wind goes cross-onshore, making it choppy and less attractive. Sunday the 12th afternoon is down to 5ft and the wind stays cross-on. Monday the 13th offers a brief window of glassy conditions with 5ft S swell and an 11-second period, and the energy is down to 673. It says “very good surf conditions” but that 5ft with a mid-range period is clean, not heavy.

The second week gets a bit more complicated. Tuesday the 14th has glassy morning surf with 4ft SSW swell, but the energy is low (583), and it’s inconsistent. Wednesday the 15th morning is the only other real highlight in this back half: 10ft ESE swell, but the period is short at 9 seconds. It’s glassy, and the energy is 2764. That short period means it’ll be a bit crumbly and disorganized, but 10ft is still a lot of water moving. Again, experts only. After that, from Thursday the 16th onward, it’s a mix of short-period (8-10 seconds) ESE swell, mostly cross-onshore or cross winds, with energy levels bouncing between 365 and 1460. Nothing consistent or clean enough to call a standout. Sunday the 19th morning offers clean cross-offshore wind with 7ft ESE swell (8-second period), which is a decent consolation for better surfers. The rest of the last few days (20th-21st) are marginal at best.

The Pick: If you’re an expert, you cannot miss Friday afternoon, 10th of July. That 13ft S groundswell with 17-second period and offshore wind is the biggest, most powerful event of the whole 16 days. The river mouth should handle it, but expect it to be big and heavy. This spot is inconsistent, so when it fires like this, it’s special. For the rest of us, Wednesday the 15th morning’s glassy 10ft but short-period surf is the next best bet. Crowds are possible here sometimes, but on a day that big, only the hardcore will be out.

Rusty.

Short Range Forecast

Light rain (total 9mm), mostly falling on Mon afternoon. Warm (max 27°C on Mon afternoon, min 23°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 7mm), mostly falling on Sat night. Warm (max 27°C on Thu afternoon, min 23°C on Thu night). Wind will be generally light.

Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Saturday
11
Sunday
12
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
2
2
1
1
3
3
4
5
4
4
5
5
8
8
5
3
5
3
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SE
15
0.9
SE
14
1.1
SE
13
1.1
SE
12
1.2
SE
16
1.8
SE
16
2.2
SE
17
3
SE
17
3
SSE
16
3
SSE
16
2
S
17
3.5
SSE
16
3.5
S
17
4
S
17
4
S
18
4
S
16
3.5
SSW
16
3
SSW
16
2.3
SSW
14
1.4
SSW
14
1.6
S
12
Wave Graph
Metric surfscale
Energy kJ
149
301
406
358
692
1494
2813
4770
4670
4821
2342
5570
6667
8224
10480
7570
6278
4513
1970
733
734
Wind (km/h)
10
S
0
ESE
10
N
5
E
10
SSE
10
SSE
5
SSE
10
SSE
0
NW
10
ESE
10
SE
5
ESE
10
SE
10
SSE
5
SSE
5
ESE
10
SSE
5
SSW
5
S
5
S
5
SW
Wind State
cross-on
glassy
cross-off
cross-on
on
on
on
on
glassy
on
on
glassy
on
on
glassy
on
cross-on
glassy
cross-on
cross-on
cross
High Tide
9:16AM1.51m
10:17PM1.62m
10:17AM1.42m
10:55PM1.60m
11:38AM1.36m
11:41PM1.58m
1:20PM1.35m
00:36AM1.58m
3:00PM1.43m
1:41AM1.60m
4:18PM1.55m
2:47AM1.65m
5:16PM1.67m
Low Tide
3:39PM0.51m
4:28AM0.75m
4:23PM0.66m
5:30AM0.68m
5:17PM0.83m
6:40AM0.57m
6:30PM0.98m
7:54AM0.44m
8:00PM1.08m
9:03AM0.28m
9:23PM1.10m
10:04AM0.12m
10:28PM1.08m
thunderstorm
thunderstorm
rain showers
rain showers
rain showers
part cloud
clear
clear
part cloud
part cloud
clear
rain showers
rain showers
rain showers
part cloud
thunderstorm
cloud
thunderstorm
cloud
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:58
4:58
4:58
4:58
5:00
5:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:15
7:15
7:15
7:15
7:14
 mm
2
3
2
1
1
1
2
1
1
2
2
5
Temp °C
26
27
24
26
25
24
26
26
23
26
27
24
25
26
25
27
25
25
27
26
25
Feels °C
30
32
28
30
28
28
28
28
27
29
30
28
28
29
29
30
29
30
31
31
30
Swell 1
Height (m)
Direction
Period (s)
0.6
SE
15
0.9
SE
14
1.1
SE
13
1.1
SE
12
1.2
SE
16
1.8
SE
16
2.2
SE
17
3
SE
17
3
SSE
16
3
SSE
16
2.4
SSE
14
3.5
SSE
16
3.5
S
17
4
S
17
4
S
18
4
S
16
3.5
SSW
16
3
SSW
16
2.3
SSW
14
1.4
SSW
14
1.6
S
12
Energy kJ
149
301
406
358
692
1494
2813
4770
4670
4821
2342
5570
6667
8224
10480
7570
6278
4513
1970
733
734
Swell 2
Height (m)
Direction
Period (s)
0.4
SSW
6
0.2
E
7
0.5
SSW
6
0.8
SE
15
0.9
SE
12
1.1
ESE
7
1.2
SSE
20
1
SSE
20
1.4
S
18
2
S
17
1.1
SSW
21
2.5
SSW
18
0.3
SE
12
0.2
E
9
1.1
S
12
0.4
SE
11
Energy kJ
10
4
20
280
224
108
1122
872
1299
2183
1135
4293
23
7
347
40
Swell 3
Height (m)
Direction
Period (s)
0.3
ESE
10
0.2
S
7
0.4
SE
18
0.4
SSW
6
0.9
ESE
8
0.5
SSE
21
0.3
E
8
0.1
SE
15
0.5
SE
10
0.2
E
9
Energy kJ
21
4
79
16
89
260
12
8
52
6
Wind waves
Height (m)
Direction
Period (s)
0.2
ESE
3
0.4
SSW
6
0.6
N
3
0.3
NNE
4
1.3
E
7
0.9
ESE
6
0.8
E
9
1
E
8
0.8
E
8
0.9
E
8
0.9
ESE
8
Energy kJ
1
10
7
3
157
60
93
136
89
108
107
Nearest Offshore or Glassy
Rating
(10 max)
1
2
2
2
4
4
5
5
5
5
5
5
7
9
8
9
5
5
4
2
3
Distance (km)
6
0
0
44
23
10
23
23
0
23
23
0
23
6
0
40
23
0
10
6
4
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
2
2
3
4
4
5
5
5
6
5
5
9
9
8
9
5
5
4
2
3
Best forecast wave conditions in Japan
Rating
(10 max)
1
2
2
3
4
4
5
5
5
6
5
5
9
9
8
9
5
5
4
2
3
Header Global
Rating
(10 max)
6
4
8
7
5
5
9
8
9
9
5
5
6
5
8
5
5
8
6
5
5
  • 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 Kaifu Rivermouth Surf forecast

The above surf forecast table for Kaifu Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kaifu Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Kaifu 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 (Kaifu 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 Kaifu 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.

Kaifu Rivermouth is 40 km (25 miles) from Muroto. If you plan a holiday in Shikoku, look for hotels and other accommodation in Muroto. Muroto has rooms for a wide range of budgets as well as car hire and transport links.

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