Kaifu Rivermouth Surf Break

Kaifu Rivermouth Surf Forecast and Surf Report

Lat Long: 33.59° N 134.36° E

Issued: 8 pm 04 Jul 2026 (local time)

Forecast update in  hr  min

Today's Kaifu Rivermouth sea temperature is
24.4° 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 4 Jul 2026:

  • Best quality surf: Friday 10 Jul, 9PM (local time) - 13ft (4.0m), 18s period, S swell with glassy winds.
  • Most powerful swell: Friday 10 Jul, 3PM (local time) - 15ft (4.5m), 18s period, S swell with 11,127 kJ wave energy.
  • Next surfable swell (1★+): Sunday 5 Jul, 6AM (local time) - 3ft (0.9m), 7s period with SSW 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 Sunday (Jul 05) at 6AM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.3m and 8s. 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 4.5m 18s and forecast to arrive on Friday (Jul 10) at 3PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Jul 07) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Sun 5th Jul)3ft (0.9m) 7s
Best Surf 9PM (Fri 10th Jul)13ft (4.0m) 18s
Most Powerful 3PM (Fri 10th Jul)15ft (4.5m) 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 yarn about what's on the cards for Kaifu Rivermouth over the next couple of weeks.

We've got a bit of a slow start, but there's some serious muscle building in the second half of the first week. The first few days are pretty flat and messy, so don't bother paddling out until we hit Tuesday the 7th. That's when the energy starts to kick in properly.

Tuesday the 7th of July is the first real standout. Early morning, we're looking at a clean 3ft groundswell from the SE with a very long 17-second period. The combined swell energy is powerful (868), and with glassy conditions and light winds, the river mouth should be offering up some proper, lined-up waves. This is the sort of session you wait for. A long period like that means the sets will have plenty of push, and the gaps between them will make getting out the back a whole lot easier. It's a bit inconsistent here, so you might have to be patient, but when they come, they'll be worth it. By the afternoon, the swell jumps to 5ft, but it gets a bit questionable with the tide and wind shifts.

The week builds from there. By Thursday the 9th, the swell is a solid 10ft from the SSE, and the combined energy is very strong (4772). This is getting into expert territory now – way too big for beginners. With onshore winds, it'll be a beast, but that's one for the big-wave chargers only.

Friday the 10th of July looks like the absolute peak of this run. We're talking a massive 13ft to 15ft swell from the S, with periods around 17-18 seconds. The energy readings are through the roof (9865 to 11127). This is serious, serious groundswell. The wind is onshore, so it'll be raw and powerful. Only for the truly experienced. The river mouth might hold, but it's going to be a battle.

After that peak, the swell slowly drops through the weekend and into the following week. Sunday the 12th of July morning is worth a mention – 8ft from the SSW, glassy, and with clean conditions. That's a fun size for experienced intermediates, but a far cry from the monster days prior.

Then we hit a bit of a lull. From about the 14th through to the 17th, the surf gets small and ordinary again. We're looking at waist-high stuff with weak energy and mixed conditions. Not worth the hassle.

There is a glimmer right at the very end of the outlook. Sunday the 19th of July morning shows 6ft from the SE with an 8-second period and absolutely *calm* glassy conditions. The combined energy is solid (837). For a Sunday morning session that looks clean and punchy, that could be a real treat, and the crowds here are sometimes an issue, so that early glass-off will be the ticket. It's a week and a half away, so don't book your flights yet, but it's got potential.

So, to sum it up: the early week is a write-off, Tuesday the 7th morning is your best shot for quality, clean waves, and Friday the 10th is the big, dangerous, expert-only highlight of the whole run.

Rusty.

Short Range Forecast

Light rain (total 9mm), mostly falling on Sat night. Warm (max 28°C on Mon afternoon, min 24°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 6mm), mostly falling on Tue night. Warm (max 27°C on Fri morning, min 22°C on Thu night). Wind will be generally light.

Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Sat
11
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
0
0
0
0
0
1
2
3
3
3
4
3
5
4
4
5
7
7
8
6
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
S
6
0.8
SSW
7
0.4
SE
9
0.4
SSW
6
0.6
SE
15
0.9
SE
14
1
SE
13
0.9
SE
17
1.5
SE
16
2.1
SE
16
2.5
SSE
18
3
SSE
16
3
SSE
16
3
SSE
16
3
SSE
16
3
S
16
4
S
17
4.5
S
18
4
S
18
4
SSW
17
3.5
SSW
17
Wave Graph
Metric surfscale
Energy kJ
23
53
32
14
149
301
347
499
1158
2214
4528
4122
4396
4772
5022
4524
9865
11127
10310
8646
7420
Wind (km/h)
5
NE
5
ESE
15
S
10
SE
15
SSW
10
SW
5
WNW
5
ESE
5
SSE
5
SSE
5
S
10
S
10
SSE
10
SE
10
SSE
0
S
10
ESE
15
SSE
0
SW
5
SE
10
S
Wind State
glassy
glassy
cross-on
on
cross
cross
glassy
glassy
on
cross-on
cross-on
cross-on
cross-on
on
on
glassy
on
on
glassy
on
cross-on
High Tide
9:11PM1.64m
8:27AM1.59m
9:43PM1.63m
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
Low Tide
2:51AM0.86m
3:02PM0.38m
3:36AM0.81m
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
rain showers
light rain
light rain
light rain
part cloud
thunderstorm
clear
part cloud
thunderstorm
rain showers
rain showers
rain showers
light rain
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:56
4:58
4:58
4:58
4:58
5:00
<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
7:15
7:15
 mm
1
1
2
2
2
1
1
2
1
2
Temp °C
24
25
25
25
26
28
25
28
27
25
26
26
24
25
25
23
27
27
24
26
27
Feels °C
28
29
29
29
29
32
30
31
31
30
30
29
28
28
28
26
29
29
28
30
31
Swell 1
Height (m)
Direction
Period (s)
0.6
S
6
0.8
SSW
7
0.6
SSW
6
0.4
SSW
6
0.6
SE
15
0.9
SE
14
1
SE
13
1.1
SE
12
1.5
SE
16
2.1
SE
16
2.5
SSE
18
3
SSE
16
3
SSE
16
3
SSE
16
3
SSE
16
3
S
16
4
S
17
4.5
S
18
4
S
18
4
SSW
17
3.5
SSW
17
Energy kJ
23
53
32
14
149
301
347
353
1158
2214
4528
4122
4396
4772
5022
4524
9865
11127
10310
8646
7420
Swell 2
Height (m)
Direction
Period (s)
0.3
ESE
9
0.3
SE
10
0.4
SE
9
0.2
ESE
8
0.4
SE
10
0.1
SE
9
0.8
SSW
7
0.9
SE
17
0.9
ESE
12
1
SSE
21
0.8
SSE
21
1.8
SSE
16
0.9
S
20
1.7
S
19
Energy kJ
15
16
20
7
27
3
50
499
235
899
588
1735
642
2118
Swell 3
Height (m)
Direction
Period (s)
0.2
SSE
9
0.2
ESE
9
0.1
E
11
0.2
SSE
8
0.1
SE
9
0.4
SE
18
0.4
SSW
6
0.4
SW
6
0.9
S
20
Energy kJ
8
7
3
7
3
79
16
9
656
Wind waves
Height (m)
Direction
Period (s)
0.3
ESE
3
0.5
SE
4
0.7
SSW
6
1.3
SSW
6
0.8
NNE
4
0.5
N
4
Energy kJ
2
7
40
122
18
7
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
2
2
3
4
5
5
5
7
6
6
5
8
9
8
7
6
Distance (km)
2
2
23
40
6
4
0
0
6
6
6
6
6
23
6
0
23
6
0
23
23
Best forecast wave conditions in Shikoku
Rating
(10 max)
2
1
1
1
2
2
3
3
4
5
5
5
7
6
6
5
9
9
8
9
9
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
1
2
3
3
3
4
5
5
5
7
9
6
5
9
9
8
9
9
Header Global
Rating
(10 max)
4
5
9
7
5
5
8
7
5
5
9
7
9
5
7
5
5
4
8
4
5
  • 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 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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