Kaifu Rivermouth Surf Break

Kaifu Rivermouth Surf Forecast and Surf Report

Lat Long: 33.59° N 134.36° E

Issued: 2 am 04 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, 9AM (local time) - 13ft (4.0m), 17s period, S swell with glassy winds.
  • Most powerful swell: Friday 10 Jul, 9PM (local time) - 13ft (4.0m), 18s period, S swell with 10,647 kJ wave energy.
  • Next surfable swell (1★+): Saturday 4 Jul, 9PM (local time) - 3.5ft (1.1m), 5s 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 Saturday (Jul 04) at 9PM. The primary swell is predicted to be 1.1m and 5s period with a secondary swell of 0.8m and 5s. Another secondary swell of 0.3m and 9s 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 4.0m 18s and forecast to arrive on Friday (Jul 10) at 9PM. 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)3.5ft (1.1m) 5s
Best Surf 9AM (Fri 10th Jul)13ft (4.0m) 17s
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’s on the menu for Kaifu Rivermouth over the next couple of weeks. It’s a slow starter, but don’t switch off just yet.

The first few days are pretty grim. From Saturday the 4th through to Sunday the 5th, it’s junk. We’re talking tiny, weak waves and dodgy onshore winds. Not even worth wetting a leg rope. Monday the 6th morning shows a tiny glimmer with glassy conditions on a 0.6m swell, but the wave energy is still weak (191). It’s ordinary at best, so don’t rush down. That’s about 2ft.

Things start to build through Tuesday the 7th. The morning is still average, but Tuesday afternoon is where it finally clicks. The wind goes glassy, and we get a solid 5ft SE groundswell ramping up with a long 17-second period. The combined energy is moderate to strong (1442), and the report calls it excellent for experienced surfers. This is the first real standout. It’s a river mouth, and that long-period swell will push through with nice lines, but remember the place is inconsistent and can get a crowd – so be ready to share.

Now, the big show. Wednesday the 8th through to Friday the 10th is where it gets serious. Swell jumps to 10ft and then 12ft. That’s proper size, only for the experienced crew. The energy readings are massive (7328, 5019, 7636). Thursday the 9th and Friday the 10th mornings have glassy conditions and clean, lined-up sets from the SSE and S. This is top-tier, heavy water. Short period? No, this is a deep, powerful groundswell with a period over 15 seconds. At a river mouth, those long-period swells wrap in beautifully. If you’ve got the skill, Friday morning the 10th is the pick of the whole forecast – glassy, 12ft, 17-second period, with exceptional conditions noted. Water temp is about average for this time of year, nothing weird going on.

Saturday the 11th holds at 12ft with glassy morning conditions – still excellent – but Sunday the 12th sees it ease back to a still-chunky 8ft. The morning is glassy again with reasonably clean lines from the SSW. After that, Monday the 13th onward drops off fast. The swell fades into the 3ft range or less, and the quality nose-dives with onshore winds and cross-shore junk. Wednesday the 15th has a brief glassy moment on tiny 2ft waves, but it’s not going to be worth the paddle.

So, to wrap it up: the standout window is from Tuesday the 7th afternoon through to Sunday the 12th morning, with the absolute best sessions being Thursday the 9th and Friday the 10th mornings. That’s big, clean, glassy groundswell at a tricky river mouth. If you’re not an expert, stay well clear on those days. After that, it’s back to the small stuff.

Stay safe out there.

Rusty.

Short Range Forecast

Heavy rain (total 37mm), heaviest during Sun afternoon. Warm (max 26°C on Mon morning, min 22°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 5mm), mostly falling on Tue afternoon. Warm (max 26°C on Tue morning, min 22°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
2
2
2
3
4
4
4
6
6
5
8
8
7
8
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
0.9
SE
4
0.8
ESE
5
0.3
SE
11
0.4
SE
9
0.8
ESE
5
0.6
SE
15
0.9
SE
14
1.1
SE
13
1.3
ESE
12
1.4
SE
17
2.2
SE
17
3
SE
17
3.5
SE
18
3
SE
16
3.5
SSE
16
3.5
SSE
16
4
SSE
16
4
S
17
4
S
17
4
S
17
Wave Graph
Metric surfscale
Energy kJ
16
28
29
24
20
28
149
301
380
487
1118
2748
5662
6461
5017
6103
6607
7847
9442
10352
10567
Wind (km/h)
5
SSE
10
WSW
10
NNE
10
SE
20
SSE
5
NNW
10
S
10
SW
10
N
10
ENE
5
SSE
5
SE
10
SE
10
SE
5
N
5
NE
10
SE
5
E
5
NE
5
ESE
5
SE
Wind State
on
cross-off
cross-off
on
on
glassy
cross-on
cross-off
cross-off
cross
cross-on
on
on
on
glassy
glassy
on
cross-on
glassy
cross-on
glassy
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
Low Tide
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
8:00PM1.08m
mod rain
mod rain
part cloud
light rain
mod rain
light rain
light rain
rain showers
rain showers
part cloud
rain showers
clear
clear
clear
part cloud
part cloud
rain showers
rain showers
light rain
cloud
part cloud
<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
 mm
8
6
3
8
4
5
2
1
1
1
3
3
Temp °C
23
24
23
24
24
25
26
26
24
26
25
23
26
25
23
26
26
24
24
24
24
Feels °C
27
28
26
27
26
30
30
31
27
29
28
26
27
27
25
29
29
27
29
28
29
Swell 1
Height (m)
Direction
Period (s)
0.3
SSW
5
0.6
SE
4
0.8
ESE
5
0.5
SSW
6
0.4
SSW
6
0.8
ESE
5
0.6
SE
15
0.9
SE
14
1.1
SE
13
1.3
ESE
12
1.4
SE
17
2.2
SE
17
3
SE
17
3.5
SE
18
3
SE
16
3.5
SSE
16
3.5
SSE
16
4
SSE
16
4
S
17
4
S
17
4
S
17
Energy kJ
5
13
29
24
15
28
149
301
380
443
1118
2748
5662
6461
5017
6103
6607
7847
9442
10352
10567
Swell 2
Height (m)
Direction
Period (s)
0.3
ESE
9
0.2
ESE
9
0.2
ESE
9
0.3
SE
11
0.4
SE
9
0.4
SW
6
0.5
SSW
6
0.1
SE
9
0.4
SSW
6
0.9
SE
17
1.2
ESE
11
1.4
ESE
8
1.5
SSE
20
1.1
S
21
2.1
S
18
Energy kJ
16
8
7
18
19
9
23
3
15
487
347
238
1597
1055
2871
Swell 3
Height (m)
Direction
Period (s)
0.3
SE
9
0.3
SE
9
0.2
ESE
11
0.2
ESE
9
0.2
S
8
0.2
ESE
8
0.4
SE
10
0.6
SSW
7
0.4
SW
6
0.8
SSE
22
Energy kJ
12
12
13
7
5
7
27
30
10
628
Wind waves
Height (m)
Direction
Period (s)
0.2
ESE
3
0.9
SE
4
0.5
ESE
4
0.7
SE
4
0.3
ENE
3
0.7
S
6
1.1
ESE
5
1.1
E
8
1.2
E
8
1.9
E
8
1.8
E
8
1.9
E
8
1.7
E
8
1.5
E
7
1.3
E
6
0.9
E
8
Energy kJ
1
28
11
20
2
38
66
146
181
458
412
453
323
214
139
111
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
3
3
4
5
7
1
5
5
6
5
6
7
Distance (km)
26
336
10
40
23
26
63
0
23
40
23
0
23
23
461
0
0
6
0
0
6
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
1
1
1
1
2
3
3
4
5
7
5
5
6
5
6
7
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
1
1
1
1
1
1
2
3
4
4
5
7
5
5
5
6
6
7
7
Header Global
Rating
(10 max)
5
5
5
4
5
9
7
5
6
8
7
5
5
9
9
9
5
6
6
7
7
  • 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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