Kaifu Rivermouth Surf Break

Kaifu Rivermouth Surf Forecast and Surf Report

Lat Long: 33.59° N 134.36° E

Issued: 8 pm 02 Jul 2026 (local time)

Forecast update in  hr  min

Today's Kaifu Rivermouth sea temperature is
24.3° 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 2 Jul 2026:

  • Best quality surf: Thursday 9 Jul, 9PM (local time) - 15ft (4.5m), 17s period, S swell with cross-offshore winds.
  • Most powerful swell: Friday 10 Jul, 3AM (local time) - 15ft (4.5m), 18s period, S swell with 11,856 kJ wave energy.
  • Next surfable swell (1★+): Monday 6 Jul, 6AM (local time) - 1.5ft (0.4m), 15s 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 6AM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.2m and 10s. Another secondary swell of 0.7m and 4s 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 4.5m 18s and forecast to arrive on Friday (Jul 10) at 3AM. 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 4s period and expected on Friday (Jul 03) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Mon 6th Jul)1.5ft (0.4m) 15s
Best Surf 9PM (Thu 9th Jul)15ft (4.5m) 17s
Most Powerful 3AM (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

Righto, grab a coffee and settle in, because the next couple of weeks at Kaifu Rivermouth are a proper rollercoaster. We’ve got a long wait ahead before anything really gets going, so don’t bother paddling out just yet.

The first week is a total write-off. From now through to Monday the 6th of July, the swell is tiny—nothing above 2ft—and the energy is pathetic, with the combined swell energy sitting between 31 and 46 (weak). It’s mostly crossed-up and messy, with nothing worth waxing up for. A few glassy moments on Friday the 3rd and Saturday the 4th, but with barely a ripple of swell, it’s more of a paddle-around than anything else.

Then things start to change. On Monday the 6th into Tuesday the 7th, the swell builds slowly, but it’s still pretty average. Monday morning sees a 2ft swell at 15 seconds from the SE, with the energy jumping to 161 (moderate), and it’s glassy—so you could get a few, but it’s not going to set the world on fire. Tuesday morning brings a 6ft swell from the SE at 16 seconds, energy up to 1670 (strong), but the wind is onshore, making it look pretty ordinary. Not the time to call in sick.

Now, the standout window arrives on Friday the 10th of July. That morning the stars align. We’ve got an absolute monster 15ft groundswell from the S, with a very long period of 17 seconds, and the wind goes glassy from the east. The combined swell energy is a huge 13661 (very strong)—this is proper power. For experts only at that size, this is the one to chase. The crowd factor means it’ll likely get a crew, but with those conditions, it’s worth the company. Keep in mind that this long-period groundswell can make the rivermouth break a bit straight, but when it’s that clean and that big, it’s going to be special.

Saturday the 11th is still pumping with a 12ft swell from the SSW at 16 seconds, glassy again in the morning, energy at 6742 (very strong)—another excellent day for experienced surfers. After that, the swell starts to wind down through the week, dropping to 6ft by Sunday the 12th and getting messier with cross-onshore winds.

From about the 13th of July onwards, it fades into a long stretch of tiny, weak surf. We’re looking at a solid 3 to 4 day gap with nothing worth a mention, until the morning of Thursday the 16th of July, when a small clean 4ft swell from the SSW at 11 seconds shows up with glassy conditions and moderate energy (315). It’s not a headline, but it’s a nice little session if you’re desperate.

So, overall: the first six days are a bust, then it fires up for a few days around the 10th and 11th, then it fades into nothing again. If you’re keen, pencil in Friday the 10th (morning) and Saturday the 11th (morning) as the real standouts—just make sure you’re an expert and ready for a crowd.

Rusty.

Short Range Forecast

Heavy rain (total 25mm), heaviest during Sat morning. Warm (max 26°C on Fri morning, min 22°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 21mm), heaviest during Mon morning. Warm (max 27°C on Tue morning, min 23°C on Sun night). Wind will be generally light.

Friday
3
Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thu
9
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
1
0
0
0
0
0
0
0
0
0
1
1
1
3
3
3
3
2
5
5
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)
0.9
SSW
7
0.5
SW
7
0.3
ESE
9
0.6
SW
6
0.3
ESE
9
0.7
SSE
4
0.3
ESE
9
0.5
SSW
6
0.4
SE
9
0.5
SE
4
0.5
SE
15
0.8
SE
14
1.1
SE
12
1.8
SE
16
2.2
SE
17
2.5
SE
17
3
SE
17
3
SSE
16
3.5
SSE
17
4
SSE
17
4
SSE
17
Wave Graph
Metric surfscale
Energy kJ
86
22
16
24
16
13
15
22
19
7
106
231
346
1651
2758
3597
5302
4646
6721
7874
9061
Wind (km/h)
10
N
10
NE
5
E
5
SW
10
SE
5
NW
5
NE
10
SSE
10
S
5
SSW
5
E
10
E
5
SE
5
SE
10
SSE
10
SE
10
SE
15
SSE
5
S
5
S
10
SSE
Wind State
cross-off
cross
glassy
glassy
on
glassy
cross
on
cross-on
cross-on
glassy
cross-on
on
on
on
on
on
on
cross-on
cross-on
cross-on
High Tide
7:07AM1.69m
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
Low Tide
1:35AM0.93m
1:55PM0.21m
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
part cloud
part cloud
light rain
light rain
heavy rain
light rain
part cloud
light rain
light rain
light rain
heavy rain
light rain
part cloud
part cloud
thunderstorm
light rain
part cloud
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
4:56
4:56
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
1
3
11
5
1
4
2
11
2
2
4
Temp °C
25
26
25
24
23
24
23
24
24
24
24
25
24
27
27
25
26
26
24
28
28
Feels °C
28
28
28
28
26
28
28
28
28
28
28
29
28
31
31
29
29
28
28
30
31
Swell 1
Height (m)
Direction
Period (s)
0.9
SSW
7
0.5
SW
7
0.4
SW
6
0.4
SSW
5
0.3
SSW
5
0.3
SE
9
0.4
ESE
4
0.5
SSW
6
0.4
SSW
6
0.2
SSW
5
0.5
SE
15
0.8
SE
14
1.1
SE
12
1.8
SE
16
2.2
SE
17
2.5
SE
17
3
SE
17
3
SSE
16
3.5
SSE
17
4
SSE
17
4
SSE
17
Energy kJ
86
22
10
9
4
12
5
22
14
3
106
231
346
1651
2758
3597
5302
4646
6721
7874
9061
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
9
0.4
SE
8
0.3
ESE
9
0.3
ESE
9
0.3
ESE
9
0.2
ESE
9
0.3
ESE
9
0.3
SE
10
0.4
SE
9
0.2
ESE
8
0.4
SE
10
0.4
ESE
9
0.5
SE
19
0.2
SSW
7
1.3
SSE
20
1
SSE
20
0.8
S
22
1
S
23
Energy kJ
19
18
16
16
16
8
15
16
19
7
26
26
173
4
1256
881
611
1029
Swell 3
Height (m)
Direction
Period (s)
0.2
ESE
12
0.3
SSE
5
0.3
SSE
5
0.2
ESE
12
0.3
SE
9
0.2
ESE
12
0.2
SSE
9
0.2
ESE
9
0.2
S
7
0.2
SSE
8
0.2
SSW
5
0.1
S
7
0.4
ESE
8
0.2
SSW
7
Energy kJ
15
6
5
14
12
13
8
7
4
7
3
1
20
4
Wind waves
Height (m)
Direction
Period (s)
0.4
NNE
3
0.4
NE
4
0.6
SW
6
0.7
SSE
4
0.2
E
4
0.3
E
4
0.5
SE
4
0.8
ESE
4
0.9
SE
5
0.8
ESE
5
0.6
SE
4
Energy kJ
4
4
24
11
1
3
6
26
32
28
11
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
3
4
4
5
5
6
8
8
9
Distance (km)
0
63
332
2
336
2
290
40
40
348
0
332
10
10
23
23
23
6
6
6
6
Best forecast wave conditions in Shikoku
Rating
(10 max)
1
1
1
1
1
1
1
3
4
4
5
5
6
8
8
9
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
2
3
4
4
7
6
6
8
8
9
Header Global
Rating
(10 max)
5
9
5
9
5
7
5
5
9
7
7
6
9
8
6
6
7
9
7
7
9
  • 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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