Surf Forecasts:
Ikumi Beach surf forecast from 16 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 4.5ft (1.3m), 10s period, SSW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 6AM (local time) - 4.5ft (1.4m), 11s period, S swell with 485 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 6AM (local time) - 3.5ft (1.0m), 5s period with SE swell.
Best Forecast Surf Conditions for Ikumi Beach this week:
The surf forecast for Ikumi Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 6AM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.5m and 8s. Another secondary swell of 0.4m and 11s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 1.4m 11s and forecast to arrive on Friday (Aug 21) at 6AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 17th Aug) | 3.5ft (1.0m) 5s |
| Best Surf | 9PM (Sat 22nd Aug) | 4.5ft (1.3m) 10s |
| Most Powerful | 6AM (Fri 21st Aug) | 4.5ft (1.4m) 11s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming up for Ikumi Beach. Straight up, the first week is a bit of a struggle. We have a few small windows of surfable waves, but nothing that’ll get your heart pumping. The real standout is a solid pulse of swell that arrives in the second week, but there’s a catch.
The Overall Pattern
We’re looking at a long 16-day window here, but the good stuff doesn’t really start cranking until the 24th of August. The first week is mostly a write-off with tiny, choppy, or onshore conditions. The water temp is sitting at a warm 83°, which is about average for the time of year, so you won’t need a thick wetsuit.
The Early Days (16th – 23rd August)
Honestly, don’t wet your wetsuit for the first week. From Sunday the 16th right through to the 23rd, it’s a real mixed bag of poor surf. The swell is small, the wind is mostly onshore, and the energy is weak. You’ll see morning swells of just 1 ft to 5 ft, but the wind is ruining it. The one tiny glimmer is on Tuesday the 18th morning, with a 2 ft swell from the ESE and glassy conditions. It’s surfable, but ordinary. The combined energy barely gets into the low hundreds, so it’s limp. The rest of the week is a write-off with rain, thunderstorms, and cross-onshore winds. The swell tries to pick up a bit on the 21st and 22nd, with a 5 ft S swell and a little more energy (539), but the wind is still messy. The 22nd and 23rd morning sessions show a clean, cross-offshore wind, but the swell is only 3 ft to 4 ft. It’s not a standout, just a passable session if you’re desperate.
The Real Standout – The Big Swell Arrives (24th – 31st August)
Hold onto your board, because from the 24th of August, the ocean wakes up. This is your best bet, and it’s a big one. On Monday the 24th morning, Ikumi Beach gets a sweet 6 ft swell from the SE with a very long period of 16 seconds. The combined energy is a massive 1842, and the wind is glassy. This is excellent surf for experienced surfers. The swell direction is a perfect ESE, which matches the break’s optimum. It’s a groundswell with that super long period, so expect proper, well-shaped waves with long lulls between sets. The crowds are often here, so you’ll likely have company.
Tuesday the 25th morning is even better – an 8 ft SE swell, period of 15 seconds, and still glassy. The energy is 2654, and it’s another excellent session for experienced surfers. This is the peak of the good stuff before it gets too big.
The Caveat – Too Big for Most
After the 25th, the swell just keeps building. By the 26th morning, it’s 12 ft from the SSE, and the wind is already cross-onshore. The energy is a staggering 5905, but it’s simply too big for this break. The same goes for the rest of the week. The 27th, 28th, 29th, 30th, and 31st all see swells of 10 ft to 21 ft with energy values in the thousands – even tens of thousands. The wind is clean on some days, but the guidance says it’s too big for Ikumi Beach. This is strictly for experts only, and honestly, it’s more of a tow-in or a look-at-from-the-beach kind of swell. For a beach break like this, with that long period, the waves might be closing out and pretty dangerous.
So, to sum it up: your best window is the morning of the 24th and 25th of August. Glassy, clean, solid groundswell, and perfect for experienced surfers. After that, it’s a monster swell that’s best left alone unless you’re a pro. The first week is a dud. Don’t hold your breath.
Rusty.
Short Range ForecastHeavy rain (total 28mm), heaviest during Sun afternoon. Warm (max 28°C on Mon afternoon, min 25°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Wed morning. Warm (max 28°C on Wed afternoon, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 6 | ESE 6 | ESE 6 | SE 5 | SE 11 | SE 11 | ESE 8 | SE 5 | SE 10 | SE 10 | SE 10 | ESE 5 | S 10 | S 9 | S 10 | S 11 | S 11 | S 10 | S 10 | SSW 10 | SSW 9 |
Wave Graph | |||||||||||||||||||||
100 | 164 | 108 | 45 | 30 | 30 | 62 | 33 | 35 | 33 | 25 | 39 | 66 | 129 | 257 | 466 | 434 | 333 | 284 | 235 | 293 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | glassy | glassy | cross-on | glassy | on | cross-on | glassy | cross-on | cross-on | glassy | cross-on | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:04PM1.93m | 8:16AM1.92m | 8:30PM1.90m | 8:59AM1.82m | 8:58PM1.86m | 9:48AM1.68m | 9:27PM1.81m | 10:51AM1.55m | 10:01PM1.74m | 12:28PM1.45m | 10:49PM1.66m | 2:49PM1.47m | 00:11AM1.59m | ||||||||
Low Tide | 1:52PM0.45m | 2:09AM0.57m | 2:23PM0.59m | 2:46AM0.55m | 2:54PM0.76m | 3:27AM0.55m | 3:26PM0.93m | 4:16AM0.59m | 4:02PM1.10m | 5:20AM0.63m | 4:54PM1.26m | 6:46AM0.65m | 6:52PM1.37m | ||||||||
5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | |
— | 6:49 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | |
mm | 6 | 9 | 7 | 1 | 1 | 2 | 1 | 1 | — | 1 | — | — | — | 2 | 1 | 2 | 1 | — | — | — | — |
Temp °C | 26 | 26 | 26 | 27 | 28 | 26 | 28 | 27 | 26 | 27 | 28 | 26 | 28 | 28 | 26 | 27 | 28 | 26 | 30 | 30 | 26 |
Feels °C | 30 | 29 | 29 | 31 | 31 | 31 | 33 | 31 | 31 | 31 | 32 | 31 | 33 | 33 | 32 | 32 | 32 | 31 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 9 | S 8 | S 8 | SE 5 | SSW 8 | SSW 8 | SE 10 | ESE 4 | E 8 | ESE 5 | SE 10 | S 10 | S 9 | S 10 | S 11 | S 11 | S 10 | S 10 | ESE 10 | SSW 9 |
51 | 39 | 35 | 33 | 29 | 20 | 19 | 28 | 13 | 33 | 20 | 25 | 66 | 129 | 257 | 466 | 434 | 333 | 284 | 41 | 185 | |
Swell 2 Height (m) Direction Period (s) | E 10 | ESE 10 | ESE 10 | SE 11 | SSW 8 | SE 11 | SE 10 | SSW 8 | E 8 | SE 10 | SE 10 | ESE 8 | SE 10 | SE 10 | ESE 4 | SE 11 | SE 11 | ESE 10 | ESE 8 | ESE 8 | ESE 7 |
51 | 35 | 31 | 42 | 21 | 30 | 28 | 11 | 35 | 26 | 25 | 12 | 25 | 26 | 12 | 29 | 29 | 55 | 13 | 11 | 10 | |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 11 | SE 11 | ESE 9 | SE 11 | E 9 | SE 11 | ESE 8 | SE 10 | SSW 8 | ESE 8 | SSW 8 | ESE 7 | S 11 | ESE 11 | E 8 | E 8 | SE 11 | SE 10 | SSE 9 | ESE 13 |
48 | 45 | 43 | 28 | 30 | 14 | 30 | 14 | 27 | 11 | 12 | 6 | 10 | 22 | 44 | 6 | 5 | 30 | 27 | 9 | 17 | |
Wind waves Height (m) Direction Period (s) | ESE 6 | ESE 6 | ESE 6 | SE 5 | — | SE 5 | ESE 8 | SE 5 | — | ESE 4 | — | ESE 5 | ESE 4 | ESE 5 | — | ESE 4 | E 8 | — | — | SSW 10 | SSW 9 |
100 | 164 | 108 | 45 | — | 25 | 62 | 33 | — | 12 | — | 39 | 13 | 19 | — | 5 | 71 | — | — | 235 | 293 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 471 | 30 | 30 | 486 | 0 | 0 | 4 | 0 | 30 | 533 | 0 | 4 | 4 | 0 | 4 | 4 | 0 | 0 | 4 | 0 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Ikumi Beach Surf forecast
The above surf forecast table for Ikumi Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ikumi Beach can be found by selecting the local surf guide option on the grey menu. Our Ikumi Beach 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 (Ikumi Beach) 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 Ikumi Beach 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.
Ikumi Beach is 30 km (19 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.











