
Surf Forecasts:
Kaifu Rivermouth surf forecast from 6 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 9PM (local time) - 10ft (3.0m), 16s period, SSE swell with glassy winds.
- Most powerful swell: Friday 10 Jul, 9PM (local time) - 15ft (4.5m), 18s period, S swell with 11,327 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 3PM (local time) - 3ft (0.9m), 14s 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 3PM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 0.4m and 6s. Another secondary swell of 1.0m and 6s 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 9PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Jul 07) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Mon 6th Jul) | 3ft (0.9m) 14s |
| Best Surf | 9PM (Wed 8th Jul) | 10ft (3.0m) 16s |
| Most Powerful | 9PM (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
Alright, mates, Rusty here with the lowdown on the next couple of weeks. It’s gonna be a weird start at Kaifu Rivermouth, but there are some real gems if you play the waiting game. The water’s about 76°, a degree or so cooler than normal, so maybe a spring suit if you’re a bit chilly.
The first few days are a total bust. Monday the 6th kicks off with a tiny 2ft SE swell, period 15 seconds, but the wind is cross-on and the energy is weak at 180. That afternoon turns glassy with a bit more push – 3ft and 391 energy – but it’s still not worth the drive. Tuesday the 7th morning has glassy 3ft SE swell with 621 energy, a little more life, but the break is inconsistent, so you’re rolling the dice. The whole first week is a slog; there’s a big gap from Monday the 6th through to Friday the 10th where the surf is just not happening unless you’re really keen for a dip.
Then Friday the 10th – the ocean wakes up proper. That morning we get a 13ft S swell, period 17 seconds, energy a massive 10553. That’s pure groundswell freight train stuff. Wind is a bit cross-on so it won’t be perfect, but that kind of size and period will have the rivermouth going off – heavy, powerful wedges. This is expert only. 13ft is no joke. The whole weekend stays huge: Saturday the 11th has another 13ft SSW swell in the morning with 9194 energy, and Sunday the 12th morning drops to 8ft SSW but goes glassy. That Sunday morning is the standout of the first week. Clean, glassy, 8ft SSW swell, 2015 energy, and 14-second period. It’s a big drop in size from the day before, but it’ll be way more manageable for strong intermediates and up. The break is inconsistent, so you’ll have a breather between sets, but the waves that show will be well-shaped.
After that, the surf fades. The next week (starting Monday the 13th) is mostly small and ordinary – 4ft to 3ft with moderate energy, and cross-on winds or glassy but tiny. Nothing to get excited about until Saturday the 18th. That morning brings a glassy 5ft S swell, 12-second period, and 791 energy – a nice clean little session for a longboard. Then Sunday the 19th is the real jewel of the second week. Morning has 10ft ESE swell, 13-second period, glassy wind, and 3320 energy. That’s a clean, powerful groundswell, and the direction suits the rivermouth perfectly. It’s big, so experts only, but if you’ve got the skills, this is the one to mark on the calendar. Afternoon holds 8ft ESE with glassy conditions and 2129 energy – still excellent. Crowds are listed as “sometimes,” so on a Sunday like that you might have some company, but it’s not a circus.
Monday the 20th morning is still solid: 7ft ESE, glassy, 1123 energy – a step down but still quality. After that, Tuesday the 21st gets a bit lumpy with onshore winds and shorter period, 9 seconds, so it’ll be a bit choppy. All in all, the best bet is Sunday the 19th for the cleanest, most powerful waves. Don’t ignore Friday the 10th if you’re a charger, but know it’s raw and cross-on. Keep an eye on the forecast – things can change, but this looks like a proper run of swell for the rivermouth.
Rusty, signing off.
Short Range ForecastModerate rain (total 11mm), heaviest on Mon afternoon. Warm (max 26°C on Mon morning, min 22°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Thu night. Warm (max 27°C on Thu morning, min 23°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
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) | SE 15 | SE 14 | SE 13 | SE 15 | SE 16 | SE 16 | SE 17 | SSE 17 | SSE 16 | SSE 16 | SSE 14 | SSE 16 | S 17 | S 17 | S 18 | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | S 12 |
Wave Graph | |||||||||||||||||||||
149 | 301 | 406 | 280 | 620 | 1384 | 3016 | 4012 | 4410 | 4761 | 2518 | 4400 | 8137 | 10478 | 10743 | 9194 | 7911 | 4802 | 1984 | 711 | 650 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-off | glassy | on | on | on | on | glassy | on | on | on | cross-on | on | on | on | on | glassy | glassy | cross-on | cross |
High Tide | 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 | 4:18PM1.55m | 2:47AM1.65m | 5:16PM1.67m | ||||||||
Low Tide | 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 | 9:03AM0.28m | 9:23PM1.10m | 10:04AM0.12m | 10:28PM1.08m | ||||||||
4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | |
— | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | |
mm | 4 | 5 | — | 1 | 1 | — | — | — | — | — | — | 4 | 1 | — | 4 | 2 | 1 | — | — | 2 | — |
Temp °C | 26 | 26 | 24 | 25 | 25 | 24 | 26 | 26 | 23 | 27 | 27 | 24 | 25 | 26 | 25 | 25 | 25 | 24 | 26 | 26 | 25 |
Feels °C | 32 | 31 | 28 | 29 | 28 | 28 | 28 | 28 | 27 | 29 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 28 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SE 15 | SE 14 | SE 13 | SE 12 | SE 16 | SE 16 | SE 17 | SSE 17 | SSE 16 | SSE 16 | SSE 14 | SSE 16 | S 17 | S 17 | S 18 | SSW 17 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | S 12 |
149 | 301 | 406 | 260 | 620 | 1384 | 3016 | 4012 | 4410 | 4761 | 2518 | 4400 | 8137 | 10478 | 10743 | 9194 | 7911 | 4802 | 1984 | 711 | 650 | |
Swell 2 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 6 | SE 15 | SE 12 | ESE 7 | SSE 20 | ESE 6 | — | — | S 17 | S 18 | SSW 20 | — | — | — | — | SE 12 | SE 12 | SSE 12 | SE 9 |
10 | 13 | 22 | 280 | 224 | 111 | 961 | 42 | — | — | 2237 | 1468 | 2416 | — | — | — | — | 23 | 23 | 439 | 42 | |
Swell 3 Height (m) Direction Period (s) | ESE 10 | E 7 | SE 18 | ESE 8 | SW 6 | SSE 22 | — | — | — | — | E 8 | — | — | — | — | — | — | — | E 10 | SE 10 | SE 14 |
21 | 4 | 79 | 81 | 6 | 263 | — | — | — | — | 12 | — | — | — | — | — | — | — | 8 | 52 | 7 | |
Wind waves Height (m) Direction Period (s) | — | SW 6 | NNE 3 | — | ESE 8 | E 7 | E 6 | — | E 6 | E 5 | — | E 5 | — | — | — | — | — | — | — | — | — |
— | 73 | 3 | — | 110 | 152 | 94 | — | 64 | 56 | — | 53 | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 0 | 6 | 10 | 23 | 23 | 0 | 23 | 23 | 23 | 23 | 23 | 40 | 40 | 23 | 0 | 0 | 6 | 2 |
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.










