Surf Forecasts:
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 Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 4th Jul) | 4.5ft (1.3m) 6s |
| Best Surf | 12AM (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 ForecastHeavy 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 SummaryModerate 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 | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | ESE 9 | SE 9 | ESE 9 | SE 5 | SSW 7 | SSW 7 | SSW 7 | SE 5 | ESE 6 | SE 14 | SE 13 | SE 18 | SE 17 | SE 16 | SE 16 | SE 17 | SE 16 | SSE 16 | SSE 16 | SSE 16 | S 17 |
Wave Graph  | |||||||||||||||||||||
 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) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | ||||||||
 |  |  |  |  | |  |  | |  | | | | | | | | |  |  | | |
 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 |
 | 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) | SW 6 | SE 9 | SSW 5 | ESE 9 | SSW 7 | SSW 7 | SSW 7 | SW 6 | SE 15 | ESE 5 | SE 13 | SE 12 | SE 17 | SE 16 | SE 16 | SE 17 | SE 16 | SSE 16 | SSE 16 | SSE 16 | S 17 |
| 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) | ESE 9 | S 5 | ESE 9 | SE 9 | E 4 | SE 10 | SE 9 | SE 16 | SSW 6 | SE 14 | SSW 6 | SE 18 | SSW 6 | SW 6 | SSE 18 | E 9 | SSE 19 | E 8 | S 17 | S 18 | E 9 |
| 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) | NE 3 | SSW 6 | SE 9 | ESE 12 | SE 9 | ESE 9 | — | S 8 | ESE 10 | SSW 6 | SE 17 | SSW 7 | — | — | — | — | E 5 | — | E 8 | — | — |
| kJ | 2 | 4 | 12 | 13 | 12 | 7 | — | 1 | 10 | 16 | 106 | 30 | — | — | — | — | 53 | — | 32 | — | — |
Wind waves Height (m) Direction Period (s) | NNE 4 | — | ESE 3 | SE 5 | — | ENE 3 | ENE 5 | SE 5 | ESE 6 | — | ESE 5 | E 4 | E 7 | ESE 6 | E 6 | E 6 | — | — | — | — | — |
| kJ | 5 | — | 1 | 42 | — | 2 | 2 | 110 | 126 | — | 44 | 9 | 53 | 48 | 67 | 80 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
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 | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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