Surf Forecasts:
Ikumi Beach surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 4.5ft (1.4m), 9s period, SSW swell with glassy winds.
- Most powerful swell: Saturday 22 Aug, 9PM (local time) - 4.5ft (1.4m), 9s period, SSW swell with 348 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 9PM (local time) - 2.5ft (0.7m), 9s period with S 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 Saturday (Aug 15) at 9PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.6m and 5s. Another secondary swell of 0.8m and 4s 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 9s and forecast to arrive on Saturday (Aug 22) at 9PM. 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 3s period and expected on Saturday (Aug 22) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 15th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 9PM (Sat 22nd Aug) | 4.5ft (1.4m) 9s |
| Most Powerful | 9PM (Sat 22nd Aug) | 4.5ft (1.4m) 9s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here, your local surf reporter. Let's have a look at what's on the cards for Ikumi Beach.
Alright folks, the truth is, we're in for a pretty bleak run at Ikumi Beach for most of the next two weeks. The first week is a write-off, honest. We're talking poor surf conditions day after day with tiny, weak swell and often the wrong direction. The water’s warm, sitting at 83°F with an anomaly of 1°F, so that's pretty much average for this time of year, but that’s about the only thing going for us.
Look, there’s a long gap right off the bat here. We don't see anything worth mentioning until Tuesday the 18th of August. Even then, it's only a couple of dodgy windows. Tuesday morning brings a tiny 2ft swell from the ESE with a period of 8 seconds, and the wind is glassy. The combined energy is weak at 124, so it’s surfable but very ordinary. Thursday the 20th offers a similar picture with a glassy morning and a 3ft swell from the ESE. It’s the same story though – very ordinary.
Then we get into the next weekend, the 22nd and 23rd of August. Saturday the 22nd morning has our first glimmer of hope with glassy winds and a 4ft swell coming from the SSW with a 9-second period. Combined energy is moderate (268). It’s not huge, but with the clean wind, it'll be the best we've seen. Sunday the 23rd morning looks similar with another clean 4ft SSW swell. These are your best bets in the first week, but they're nothing to write home about. Still, with the offshore wind predicted, it’ll be clean. Remember though, it’s an inconsistent break, so you’ll be waiting around.
Now, here’s where it gets interesting, and a little bit scary for a spot like this. On the 25th of August, Tuesday morning, we’ve got a massive 10ft groundswell from the SE with a very long 16-second period. The combined energy is a staggering 3795 – that is strong, powerful water. The wind is forecast to be glassy too. For a moment, that sounds like the session of the year, but here is the problem: this break gets exposed and that swell is predicted to be too big for Ikumi. This one is strictly for experts only. For the rest of us, it's just a show.
Following that, Monday the 24th of August afternoon actually sees that pulse start to arrive with a 5ft swell from the SE and a very long 17-second period (combined energy 1429), but the wind is cross-shore and conditions are marginal.
Don’t get too excited for the rest of the run. That big pulse drains away quickly. By Thursday the 27th, we’re back to small, weak and onshore junk. The final weekend of August looks completely blown out with strong winds, making it a total no-go for surfing.
So, if you want the honest truth: the standout is undeniably the Tuesday morning of the 25th of August with that huge, glassy groundswell, but only if you are a seasoned expert. For everyone else, the clean, shoulder-high windows on the mornings of the 22nd and 23rd of August are your best chance at a paddle. Just keep your expectations low.
Rusty.
Short Range ForecastHeavy rain (total 41mm), heaviest during Sun morning. Warm (max 28°C on Sat afternoon, min 25°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 29°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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) | S 9 | S 9 | ESE 6 | ESE 6 | ESE 6 | SE 5 | SE 5 | ESE 5 | ESE 8 | ESE 10 | E 9 | ESE 8 | SE 10 | SE 10 | ESE 5 | SE 10 | ESE 10 | SE 11 | S 8 | S 10 |
Wave Graph | ||||||||||||||||||||
79 | 56 | 160 | 213 | 108 | 43 | 36 | 38 | 57 | 31 | 38 | 76 | 26 | 33 | 40 | 33 | 41 | 42 | 43 | 230 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | on | on | glassy | glassy | cross-on | glassy | on | on | glassy | glassy | cross-on | glassy | cross-on | cross-on | glassy |
High Tide | 7:39PM1.94m | 7:35AM1.99m | 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 | |||||||
Low Tide | 1:34AM0.63m | 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 | ||||||||
— | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | |
6:50 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | |
mm | 1 | 4 | 9 | 9 | 8 | 3 | 2 | 4 | 1 | 1 | — | — | — | — | — | — | — | 1 | — | — |
Temp °C | 28 | 25 | 26 | 26 | 26 | 28 | 28 | 26 | 27 | 28 | 26 | 28 | 28 | 26 | 29 | 28 | 25 | 27 | 28 | 26 |
Feels °C | 31 | 29 | 29 | 29 | 30 | 32 | 31 | 31 | 32 | 32 | 32 | 31 | 32 | 32 | 32 | 32 | 30 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 8 | S 9 | S 8 | SSW 8 | SSW 8 | SSW 8 | ESE 8 | ESE 10 | ESE 4 | ESE 8 | ESE 8 | SE 10 | SE 10 | ESE 5 | S 7 | SSE 7 | S 8 | S 10 |
79 | 56 | 51 | 56 | 35 | 22 | 21 | 20 | 57 | 31 | 13 | 76 | 22 | 25 | 25 | 19 | 28 | 42 | 43 | 230 | |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 9 | SE 18 | ESE 10 | ESE 10 | SE 11 | SE 11 | SE 11 | SSW 8 | SSW 8 | E 9 | SE 10 | SE 10 | ESE 8 | SSW 8 | SE 10 | ESE 10 | SSW 8 | SSE 7 | ESE 10 |
31 | 26 | 13 | 33 | 31 | 42 | 30 | 30 | 19 | 11 | 38 | 25 | 26 | 12 | 6 | 33 | 41 | 19 | 28 | 38 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 12 | ESE 10 | SE 11 | SE 11 | ESE 9 | ESE 9 | E 9 | SE 11 | SE 10 | SE 10 | SSW 8 | SSW 8 | SSW 8 | S 9 | S 4 | ESE 4 | SE 11 | ESE 4 | E 14 |
16 | 22 | 10 | 33 | 43 | 28 | 16 | 14 | 30 | 17 | 27 | 11 | 13 | 6 | 2 | 6 | 3 | 29 | 6 | 4 | |
Wind waves Height (m) Direction Period (s) | — | ESE 5 | ESE 6 | ESE 6 | ESE 6 | SE 5 | SE 5 | ESE 5 | ESE 4 | ESE 5 | — | — | ESE 5 | ESE 5 | ESE 5 | — | — | ESE 3 | — | — |
— | 25 | 160 | 213 | 108 | 43 | 36 | 38 | 18 | 27 | — | — | 15 | 33 | 40 | — | — | 4 | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 33 | 30 | 30 | 30 | 30 | 30 | 486 | 0 | 0 | 4 | 0 | 30 | 533 | 0 | 0 | 486 | 0 | 30 | 4 | 0 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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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.











