Kaifu Rivermouth Surf Break

Kaifu Rivermouth Surf Forecast and Surf Report

Lat Long: 33.59° N 134.36° E

Issued: 2 pm 03 Jul 2026 (local time)

Forecast update in  hr  min

Today's Kaifu Rivermouth sea temperature is
24.6° C

Slightly cooler than normal

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 3 Jul 2026:

  • Best quality surf: Friday 10 Jul, 12AM (local time) - 10ft (3.0m), 16s period, SSE swell with glassy winds.
  • Most powerful swell: Friday 10 Jul, 9AM (local time) - 11ft (3.5m), 17s period, S swell with 7,689 kJ wave energy.
  • Next surfable swell (1★+): Saturday 4 Jul, 9PM (local time) - 4.5ft (1.3m), 6s period with SW 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 Saturday (Jul 04) at 9PM. The primary swell is predicted to be 1.3m and 6s period with a secondary swell of 0.7m and 5s. Another secondary swell of 0.5m and 5s is also forecast. 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 3.5m 17s and forecast to arrive on Friday (Jul 10) at 9AM. Winds are predicted to be glassy at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sat 4th Jul)4.5ft (1.3m) 6s
Best Surf12AM (Fri 10th Jul)10ft (3.0m) 16s
Most Powerful 9AM (Fri 10th Jul)11ft (3.5m) 17s

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


Updates in  hr  min  s Forecast update imminent

Alright, let’s chat about Kaifu Rivermouth in feet and miles per hour. The next couple of weeks start quiet, but there’s a proper pulse of size and clean conditions in the second week that’s worth setting an alarm for.

The water temp is 76°, which is only a touch cooler than what you’d expect for this time of year – nothing crazy.

We kick off flat. Friday the 3rd and Saturday the 4th are both tiny, with only 1ft of swell. Saturday afternoon bumps to 3ft, but with a short 5-second period and cross-on wind, it’s a mess. Sunday the 5th morning gives you 3ft from the SSW with glassy conditions – surfable but nothing special. Then a small lull.

Monday the 6th morning has 5ft of weak energy, but by the afternoon the energy picks up and the swell drops to 3ft. However, that’s a long 14-second period groundswell from the SE with glassy wind. That’s a nice little clean session for the river mouth.

From Tuesday the 7th things build. Tuesday morning sees 4ft onshore, but the energy is climbing. By Tuesday afternoon we’ve got 6ft, 17-second period, with moderate energy – cross-on wind though.

Wednesday the 8th is serious. Morning brings 10ft of SE swell with a 16-second period, and strong energy. That’s over 8ft, so expert-only. Onshore wind, so lumpy but powerful. The afternoon stays similar.

Thursday the 9th keeps the 10ft size going with heavy energy. Still onshore or cross-on.

Then the standout. Friday the 10th morning – this is the one. Kaifu Rivermouth sees 12ft of southerly swell, 17-second period, with very strong energy. And the wind? Glassy – dead calm. That is exceptional for experts only. The swell direction from the S lines up well with the optimum SE direction for this break. This spot is inconsistent, and with a 17-second period the long lulls between sets make paddling out easier, but the sets will be thick. Crowds can show up here sometimes.

Saturday the 11th morning stays big at 12ft, glassy again, with very strong energy. Another excellent session for experienced surfers.

Sunday the 12th morning drops to 7ft, with glassy wind and good energy – still excellent for experienced surfers.

After that, it fades. Monday the 13th onwards shrinks below 5ft, and by Wednesday the 15th through to the 18th we’re back to tiny 1ft to 2ft slop with poor conditions and weak energy.

So the standout is Friday the 10th morning – 12ft, glassy, groundswell, and huge energy. Get on it if you’re ready for the big stuff.

Rusty.

Short Range Forecast

Heavy rain (total 23mm), heaviest during Sat morning. Warm (max 27°C on Sun afternoon, min 23°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 10mm), heaviest on Tue night. Warm (max 26°C on Mon afternoon, min 23°C on Tue night). Wind will be generally light.

Fri
3
Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
0
0
0
0
1
1
0
1
1
2
1
2
3
3
5
4
4
4
5
6
6
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)
0.3
ESE
9
0.4
SE
9
0.3
ESE
9
1
SE
5
0.9
SSW
7
0.8
SSW
7
0.6
SSW
7
1.4
SE
5
1.4
ESE
6
0.8
SE
14
1
SE
13
0.8
SE
18
1.8
SE
17
2.4
SE
16
3
SE
16
3
SE
17
3
SE
16
3
SSE
16
3
SSE
16
3
SSE
16
3.5
S
17
Wave Graph
Metric surfscale
Energy kJ
16
21
16
42
62
56
34
110
126
238
326
421
2007
3059
4367
5364
3794
4821
5036
4528
7689
Wind (km/h)
5
E
5
WSW
5
SSE
10
S
10
W
5
NE
10
SSW
5
WNW
5
WNW
5
SE
5
ESE
10
SE
10
S
10
SE
10
SE
10
SSE
5
SSE
5
SSE
10
SSE
5
SW
5
S
Wind State
glassy
glassy
glassy
cross-on
cross-off
glassy
cross-on
glassy
glassy
glassy
on
on
cross-on
on
on
on
cross-on
on
cross-on
glassy
glassy
High Tide
8:41PM1.65m
7:45AM1.65m
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
Low Tide
2:11AM0.89m
2:28PM0.28m
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
part cloud
rain showers
mod rain
light rain
part cloud
part cloud
thunderstorm
light rain
light rain
rain showers
part cloud
rain showers
light rain
light rain
light rain
rain showers
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:56
4:56
4:58
4:58
4:58
4:58
<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
2
6
5
1
5
4
2
1
1
3
2
1
Temp °C
25
24
23
24
24
26
27
25
26
26
24
25
25
24
24
24
24
25
26
24
28
Feels °C
28
28
27
27
28
30
31
30
31
31
28
29
29
27
27
27
27
28
28
28
31
Swell 1
Height (m)
Direction
Period (s)
0.4
SW
6
0.4
SE
9
0.3
SSW
5
0.2
ESE
9
0.9
SSW
7
0.8
SSW
7
0.6
SSW
7
0.3
SW
6
0.5
SE
15
1
ESE
5
1
SE
13
1.2
SE
12
1.8
SE
17
2.4
SE
16
3
SE
16
3
SE
17
3
SE
16
3
SSE
16
3
SSE
16
3
SSE
16
3.5
S
17
Energy kJ
10
21
5
8
62
56
34
5
106
51
326
421
2007
3059
4367
5364
3794
4821
5036
4528
7689
Swell 2
Height (m)
Direction
Period (s)
0.3
ESE
9
0.3
S
5
0.3
ESE
9
0.1
SE
9
0.5
E
4
0.3
SE
10
0.4
SE
9
0.1
SE
16
0.4
SSW
6
0.8
SE
14
0.6
SSW
6
0.8
SE
18
0.5
SSW
6
0.5
SW
6
1.8
SSE
18
0.4
E
9
1.2
SSE
19
0.6
E
8
2.1
S
17
1.9
S
18
0.5
E
9
Energy kJ
16
5
16
3
9
16
20
10
16
238
27
409
22
16
2237
25
1117
47
2404
2351
38
Swell 3
Height (m)
Direction
Period (s)
0.3
NE
3
0.2
SSW
6
0.3
SE
9
0.2
ESE
12
0.3
SE
9
0.2
ESE
9
0.1
S
8
0.2
ESE
10
0.4
SSW
6
0.4
SE
17
0.6
SSW
7
1
E
5
0.5
E
8
Energy kJ
2
4
12
13
12
7
1
10
16
106
30
53
32
Wind waves
Height (m)
Direction
Period (s)
0.4
NNE
4
0.2
ESE
3
1
SE
5
0.3
ENE
3
0.2
ENE
5
1.4
SE
5
1.4
ESE
6
0.9
ESE
5
0.5
E
4
0.7
E
7
0.8
ESE
6
1
E
6
1.1
E
6
Energy kJ
5
1
42
2
2
110
126
44
9
53
48
67
80
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
2
2
2
4
4
6
6
5
5
8
6
6
Distance (km)
290
26
336
6
0
0
23
0
0
0
23
23
6
23
23
6
6
6
6
0
0
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
1
1
1
2
2
3
2
4
4
6
6
5
5
8
6
6
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
1
1
1
1
1
1
2
3
3
3
4
4
6
6
5
5
8
6
6
Header Global
Rating
(10 max)
5
8
5
4
5
5
9
6
7
6
9
7
5
6
9
9
9
6
5
6
6
  • 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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