Surf Forecasts:
Kaifu Rivermouth surf forecast from 4 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 Type | Time (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, Rusty here again, looking at Kaifu Rivermouth. This is an inconsistent river mouth break that needs a lot of things to line up. The water temp is 76°F, running a touch cooler than average for July – nothing extreme.
The first few days through July 7th are a total dud. We’re talking tiny surf – 1ft of slop from the ESE on Saturday morning, then a messy 3ft SE swell with a period of only 4 seconds in the afternoon. Sunday and Monday are more onshore junk with weak wave energy in the 34 to 61 range. Don’t even bother.
On Monday afternoon, July 6th, you’ll see the first sign of life: a 3ft SE swell with a much longer period of 14 seconds, with light cross-off wind. Energy hits 342 – moderate. Still not a standout, but you can see some lines forming.
Now for the big call. This is for experts only. Thursday morning, July 9th, we get a proper highlight. Swell hits 12ft from the SSE, period of 16 seconds, with glassy light ENE wind. Combined energy is huge at 7158. This is big, clean, and powerful. Over 8ft, so only for experienced chargers. A river mouth loves a long-period groundswell like this.
Friday morning, July 10th, is even better for the experts. Swell is 13ft from the south, period 17 seconds, and the wind is glassy from the ENE again. Energy is a massive 9553. This is the best of the whole forecast – clean, huge, and absolutely for experts only.
Saturday July 11th still has 12ft swell but onshore wind muddies it a bit. Sunday morning July 12th drops to 8ft from the SSW, still glassy, which is good for strong intermediates.
After that, it all fades. By July 13th, we’re down to 4ft, and from the 14th onward, it’s 2-3ft dribble with poor energy (98 to 192). The rest of the run into July 19th is flat and messy. Not worth the drive.
So, the bottom line: don’t bother early. The absolute standouts are the mornings of July 9th and 10th for expert surfers only. After that, it’s small and ordinary again.
Rusty.
Short Range ForecastHeavy 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 SummaryLight 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 | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | ESE 9 | SE 4 | ESE 5 | SE 11 | SE 9 | ESE 5 | SE 15 | SE 14 | SE 13 | ESE 12 | SE 17 | SE 17 | SE 17 | SE 18 | SE 16 | SSE 16 | SSE 16 | SSE 16 | S 17 | S 17 | S 17 |
Wave Graph  | |||||||||||||||||||||
 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) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | ||||||||
 | |  |  | |  | |  |  |  | |  |  | | | | | | |  | | |
 | 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 | — |
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) | SSW 5 | SE 4 | ESE 5 | SSW 6 | SSW 6 | ESE 5 | SE 15 | SE 14 | SE 13 | ESE 12 | SE 17 | SE 17 | SE 17 | SE 18 | SE 16 | SSE 16 | SSE 16 | SSE 16 | S 17 | S 17 | S 17 |
| 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) | ESE 9 | ESE 9 | ESE 9 | SE 11 | SE 9 | SW 6 | SSW 6 | SE 9 | SSW 6 | SE 17 | ESE 11 | ESE 8 | — | — | SSE 20 | S 21 | — | S 18 | — | — | — |
| kJ | 16 | 8 | 7 | 18 | 19 | 9 | 23 | 3 | 15 | 487 | 347 | 238 | — | — | 1597 | 1055 | — | 2871 | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 9 | ESE 11 | ESE 9 | S 8 | ESE 8 | SE 10 | — | — | SSW 7 | SW 6 | SSE 22 | — | — | — | — | — | — | — | — | — |
| kJ | 12 | 12 | 13 | 7 | 5 | 7 | 27 | — | — | 30 | 10 | 628 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 3 | SE 4 | — | ESE 4 | SE 4 | — | ENE 3 | S 6 | ESE 5 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | — | E 7 | E 6 | E 8 | — | — |
| kJ | 1 | 28 | — | 11 | 20 | — | 2 | 38 | 66 | 146 | 181 | 458 | 412 | 453 | 323 | — | 214 | 139 | 111 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 336 | 4 | 2 | 40 | 290 | 26 | 6 | 0 | 0 | 25 | 6 | 10 | 23 | 40 | 0 | 0 | 23 | 4 | 0 | 4 | 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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