Kaifu Rivermouth Surf Break

Kaifu Rivermouth Surf Forecast and Surf Report

Lat Long: 33.59° N 134.36° E

Issued: 2 pm 06 Jul 2026 (local time)

Forecast update in  hr  min

Today's Kaifu Rivermouth sea temperature is
24.6° C

1.2°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 6 Jul 2026:

  • Best quality surf: Saturday 11 Jul, 12AM (local time) - 13ft (4.0m), 18s period, S swell with glassy winds.
  • Most powerful swell: Saturday 11 Jul, 12AM (local time) - 13ft (4.0m), 18s period, S swell with 10,480 kJ wave energy.
  • Next surfable swell (1★+): Monday 6 Jul, 9PM (local time) - 3.5ft (1.1m), 13s 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 9PM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.5m and 6s. The wind is predicted to be cross-offshore 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 Saturday (Jul 11) at 12AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Jul 07) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Mon 6th Jul)3.5ft (1.1m) 13s
Best Surf12AM (Sat 11th Jul)13ft (4.0m) 18s
Most Powerful12AM (Sat 11th 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 look at what's coming down the pipe for the next couple of weeks.

Well, it’s a bit of a slow start, but there’s a pulse of energy building. The first real chance for a wave is Monday the 6th of July, but it’s pretty small. The main event is toward the end of the first week, so don’t get too excited just yet.

Kaifu Rivermouth is our only break on the list, and it’s a river mouth setup that’s inconsistent, so when it fires, it’s a treat. The water is 76°, which is a bit colder than we’d normally expect for this time of year. The early part of the week is small. Monday afternoon the 6th brings glassy conditions with a tiny 3ft SE swell, but the energy is weak (316). It’s surfable, but not worth rushing for.

Tuesday morning the 7th looks better. The swell bumps up to 4ft from the ESE, and with a period of 12 seconds and glassy conditions, it’ll be clean. The combined energy jumps to 854, which is a solid moderate level. This is a good little window for a session. Tuesday afternoon gets messy with rain and onshore wind, so stick to the morning.

The real build-up starts Wednesday the 8th. The swell hits 7ft SE on Wednesday morning, and by the afternoon it’s 8ft. The period is a long 15-16 seconds, which is proper groundswell. This is where it gets interesting. The energy is strong (3000 and 3591). However, the wind is light and onshore, so the surface won’t be perfect. This is big, powerful, and only for experienced surfers.

Thursday the 9th stays solid, with 8ft to 10ft SSE swell. The energy is still very strong (3596 and 3678). Again, onshore wind is the letdown. It’s powerful, but a bit bumpy.

Friday the 10th is the standout. The swell jumps to 11ft on Friday morning and hits 13ft by Friday afternoon, all from the S. The period is a very long 16 seconds, and the energy is absolutely pumping (7228 and 11634). This is a big, powerful groundswell. The wind is still light and onshore, but the sheer size and energy will make for some serious waves. This is big-wave territory, experts only.

Saturday the 11th is still pumping, with 13ft S swell in the morning, easing to 11ft SSW by the afternoon. The afternoon session looks magic – the wind goes glassy, and the energy is still massive (6278). This is the best window of the whole outlook: big, clean, and powerful. A special session for the experienced crew. The morning is still solid but with light onshore wind.

From Sunday the 12th, the swell starts to drop quickly. It’s 7ft on Sunday morning, then fading fast. The energy drops to 1888. The onshore wind returns. Monday the 13th has a small, clean window in the morning with 4ft S swell and glassy conditions, but it's weak (462). After that, the surf gets small and messy through the middle of the week, with poor conditions and cross-onshore winds.

There’s a gap of poor to flat surf from the 14th to the 18th of July. The 17th and 18th are basically flat, with tiny 1ft to 2ft waves and almost no energy (49 to 137). It’s a real lull.

Then, out of nowhere, there’s a late pulse on Sunday the 19th of July. A 8ft ESE swell arrives in the afternoon, with moderate energy (1462). The wind is light and cross-onshore, so it will be a bit textured. This is a promising but less certain long-range option. Monday the 20th looks even better: a 7ft ESE swell with glassy conditions and a very good energy level (1223). The wind is light and clean. This could be a great surprise session for those who wait.

After that, Tuesday the 21st holds at 7ft to 8ft ESE, but the wind is onshore again, so it loses its appeal.

For the best, your two true standouts are Friday the 10th and Saturday the 11th – massive, powerful groundswell, but only for the experienced. If you want a smaller, cleaner window, Tuesday morning the 7th and Monday morning the 13th are your best bets for a more relaxed paddle.

Stay safe out there.

Rusty.

Short Range Forecast

Light rain (total 8mm), mostly falling on Mon night. Warm (max 27°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Sat morning, min 22°C on Thu night). Wind will be generally light.

Mon
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Saturday
11
Sunday
12
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
2
2
3
1
3
3
3
4
3
2
5
5
7
8
6
5
5
3
2
2
2
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)
0.9
SE
14
1.1
SE
13
1.2
ESE
12
1.2
SE
16
2.1
SE
16
2.1
SE
15
2.5
SE
16
2.5
SE
15
2.5
SSE
16
3
SSE
15
3
SSE
15
3.5
S
16
4
S
16
4
S
18
4
S
17
3.5
SSW
16
3
SSW
16
2.2
SSW
14
1.3
SSW
13
1.4
SSW
12
1.3
S
11
Wave Graph
Metric surfscale
Energy kJ
301
406
417
692
2009
1882
3555
2773
3560
3479
3592
6219
7620
10480
8661
6278
4181
1859
606
560
418
Wind (km/h)
5
E
10
N
5
E
10
SSE
5
SE
10
SE
10
SSE
0
N
10
ESE
10
SSE
0
N
10
SE
10
SSE
5
SE
5
SSE
5
S
5
SSW
5
SSE
10
S
5
SW
5
SE
Wind State
glassy
cross-off
glassy
on
on
on
on
glassy
on
on
glassy
on
on
glassy
on
glassy
glassy
on
cross-on
glassy
glassy
High Tide
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
3:49AM1.73m
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
10:59AM-0.01m
thunderstorm
rain showers
rain showers
rain showers
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:58
4:58
4:58
4:58
5:00
5:01
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
7:14
 mm
3
3
1
1
Temp °C
27
24
25
25
23
26
26
23
26
26
23
26
26
24
27
26
25
26
26
24
28
Feels °C
32
28
29
28
26
29
29
27
29
28
27
29
29
28
30
30
30
30
29
28
30
Swell 1
Height (m)
Direction
Period (s)
0.9
SE
14
1.1
SE
13
1.2
ESE
12
1.2
SE
16
2.1
SE
16
2.1
SE
15
2.5
SE
16
2.5
SE
15
2.5
SSE
16
3
SSE
15
3
SSE
15
3.5
S
16
4
S
16
4
S
18
4
S
17
3.5
SSW
16
3
SSW
16
2.2
SSW
14
1.3
SSW
13
1.4
SSW
12
1.3
S
11
Energy kJ
301
406
417
692
2009
1882
3555
2773
3560
3479
3592
6219
7620
10480
8661
6278
4181
1859
606
560
418
Swell 2
Height (m)
Direction
Period (s)
0.4
SSW
6
0.5
SSW
6
0.8
SE
15
1.2
ESE
8
0.6
SSE
20
1.3
SSE
18
1
SSE
19
0.5
E
8
0.6
E
8
1.2
S
18
1
S
21
2.5
SSW
18
0.3
SE
12
0.3
SE
12
1
S
12
0.4
SE
9
0.4
SE
10
Energy kJ
11
22
280
172
275
1042
772
36
50
942
908
3975
23
22
294
31
27
Swell 3
Height (m)
Direction
Period (s)
0.2
E
7
0.4
SE
18
0.4
SSW
6
0.9
SE
12
0.3
E
8
0.4
E
8
0.5
E
9
0.3
SE
12
0.2
E
10
0.4
SE
11
0.3
ESE
8
0.3
ESE
9
Energy kJ
4
79
16
224
12
22
39
23
7
40
14
17
Wind waves
Height (m)
Direction
Period (s)
0.6
E
7
1.3
E
6
1.2
E
7
1
E
6
0.8
ESE
5
0.6
E
5
1
E
8
0.7
E
8
0.8
E
9
Energy kJ
38
141
134
76
36
17
137
63
101
Nearest Offshore or Glassy
Rating
(10 max)
2
2
3
4
4
4
4
4
5
3
5
6
2
8
8
5
5
4
2
2
2
Distance (km)
0
0
0
23
6
23
23
0
23
477
0
23
442
0
23
0
0
10
6
0
0
Best forecast wave conditions in Shikoku
Rating
(10 max)
2
3
3
4
4
5
4
5
5
5
8
8
9
5
5
4
2
3
3
Best forecast wave conditions in Japan
Rating
(10 max)
2
3
3
4
4
5
4
5
6
3
5
8
4
8
9
5
5
4
4
3
3
Header Global
Rating
(10 max)
7
8
7
5
5
9
8
9
8
7
5
6
5
8
5
5
5
5
5
9
8
  • 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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