
Surf Forecasts:
Ikumi Beach surf forecast from 5 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 3PM (local time) - 15ft (4.5m), 16s period, SE swell with onshore winds.
- Most powerful swell: Thursday 6 Aug, 3PM (local time) - 16ft (5.0m), 14s period, SE swell with 10,852 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 3PM (local time) - 15ft (4.5m), 16s 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 Wednesday (Aug 05) at 3PM. The primary swell is predicted to be 4.5m and 16s period. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 5.0m 14s and forecast to arrive on Thursday (Aug 06) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 14s period and expected on Monday (Aug 10) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Wed 5th Aug) | 15ft (4.5m) 16s |
| Best Surf | 3PM (Wed 5th Aug) | 15ft (4.5m) 16s |
| Most Powerful | 3PM (Thu 6th Aug) | 16ft (5.0m) 14s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here, looking at the waves for Ikumi Beach. First thing to note, the water is a touch warmer than usual for this time of year, about 85°, which is a nice bonus.
Right now, the only spot on the radar for us is Ikumi Beach. This is a beginner-friendly break, but it's inconsistent, so don't go banking on it. The first real chance to get wet doesn't come until late in the first week. The early part of the week is a write-off. We're looking at a massive, powerful groundswell pounding the coast. Wednesday the 5th has a solid 15 ft swell out of the ESE with a super long 16-second period, packing a massive amount of energy (9886). That's way too much for this spot, and it's blowing a cross-onshore breeze, so it's not just big, it's messy. Thursday and Friday are the same story – dangerous, blown-out conditions with 15 ft to 16 ft swell. Saturday the 8th to Monday the 10th is still no good, with poor surf conditions and moderate onshore winds.
The light at the end of this tunnel is the morning of Tuesday the 11th of August. The wind drops to nothing, giving us a glassy surface. The swell drops to a manageable 4 ft out of the SSW with a 12-second period (energy of 977). For a beginner spot, this is about as good as it gets. The conditions are clean, and the swell is a nice, rideable size. Wednesday morning the 12th is also a good call, with similar 5 ft SSW swell and glassy conditions (energy of 547). These are the standouts – the only two truly clean windows in the whole outlook.
After that, the swell gets smaller and the wind starts to turn a bit cross-onshore again. Through the middle of the month, we're looking at small, marginal surf. The morning of the 15th of August has a bit of a cross-offshore breeze with a 4 ft ESE swell, but it's a short period (6 seconds) and the energy is low (230). It's rideable, but not a highlight. The afternoon of the 17th brings a small 5 ft ESE swell, but it's blown out and choppy.
Looking further out, the 18th of August sees a long period SE swell (18 seconds) that bumps the energy up (1843), but the wind is a cross-shore mess. Then on the 19th, we get another massive swell event – 13 ft out of the SE with a 15-second period (energy of 6081). Just like the start of the month, it's way too big and powerful for Ikumi Beach, and the wind is onshore. The 20th of August looks a little better, with a 8 ft ESE swell, but the wind is still onshore.
So, to sum it up: the first week is a dog. The best windows are the glassy mornings of the 11th and 12th of August. If you're a beginner, those are your only real options. The rest of the window is either too big, too small, or too windy. For the experienced crew, the big swells on the 19th might look interesting, but with the wind and the size at this exposed beach break, it's probably more of a kite-surfing setup than a paddle-surfing one.
Rusty.
Short Range ForecastHeavy rain (total 54mm), heaviest during Fri night. Warm (max 30°C on Wed morning, min 26°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 25mm), heaviest during Sun night. Warm (max 29°C on Sat morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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 16 | SE 16 | SE 15 | SE 14 | SE 14 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | S 13 | SSW 13 | SSW 13 | E 13 | SSW 14 | SSW 14 | S 12 | SSW 13 | SSW 13 | S 12 | SSW 12 | SSW 11 |
Wave Graph | |||||||||||||||||||||
9886 | 10672 | 8711 | 7714 | 10852 | 9049 | 8490 | 7235 | 5595 | 2431 | 2338 | 1929 | 1538 | 1176 | 929 | 273 | 965 | 1044 | 410 | 669 | 553 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | on | glassy | glassy | on | glassy |
High Tide | 10:30AM1.59m | 10:12PM1.75m | 11:49AM1.48m | 10:54PM1.69m | 1:46PM1.44m | 11:54PM1.64m | 3:40PM1.52m | 1:21AM1.61m | 4:41PM1.64m | 2:48AM1.66m | 5:20PM1.74m | 3:55AM1.74m | 5:52PM1.82m | ||||||||
Low Tide | 4:06PM0.96m | 5:09AM0.65m | 4:51PM1.14m | 6:23AM0.65m | 6:05PM1.29m | 7:51AM0.60m | 8:11PM1.35m | 9:08AM0.51m | 9:44PM1.29m | 10:08AM0.40m | 10:39PM1.19m | 10:55AM0.31m | 11:20PM1.07m | ||||||||
5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | |
— | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | 5 | 11 | 9 | 9 | 20 | 2 | — | 7 | 1 | 5 | 9 | 1 | — | — | — | — | — |
Temp °C | 30 | 30 | 27 | 30 | 30 | 27 | 28 | 28 | 26 | 29 | 28 | 26 | 27 | 27 | 26 | 28 | 27 | 26 | 29 | 29 | 26 |
Feels °C | 32 | 32 | 30 | 31 | 31 | 30 | 30 | 30 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 27 | 30 | 32 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | SE 16 | SE 15 | SE 14 | SE 14 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | S 13 | SSW 13 | SSW 13 | SE 8 | SSW 14 | SSW 14 | SW 14 | SSW 13 | SSW 13 | S 12 | SSW 12 | SSW 11 |
9886 | 10672 | 8711 | 7714 | 8530 | 9049 | 8490 | 7235 | 5595 | 2431 | 2338 | 1929 | 485 | 1176 | 929 | 743 | 965 | 1044 | 373 | 669 | 553 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | E 15 | E 14 | SE 9 | SSW 14 | S 12 | E 13 | S 12 | E 12 | ESE 6 | SSW 12 | ESE 11 | ESE 12 |
— | — | — | — | — | — | — | — | — | 4 | 16 | 514 | 1468 | 396 | 272 | 273 | 110 | 82 | 410 | 198 | 140 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SE 16 | ESE 13 | E 13 | S 12 | SSE 7 | S 12 | E 12 | ESE 11 | SE 13 | SSE 13 |
— | — | — | — | — | — | — | — | — | — | — | 10 | 280 | 350 | 187 | 81 | 73 | 69 | 194 | 7 | 17 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SE 14 | — | — | E 10 | SE 10 | SE 10 | SE 9 | ESE 9 | E 13 | SE 7 | SE 7 | ESE 6 | SE 6 | — | — | — | SW 3 |
— | — | — | — | 10852 | — | — | 985 | 1652 | 1129 | 744 | 360 | 1538 | 254 | 227 | 142 | 201 | — | — | — | 5 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 522 | 14 | 36 | 471 | 47 | 486 | 471 | 471 | 486 | 486 | 47 | 471 | 471 | 516 | 381 | 1549 | 0 | 0 | 30 | 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.











