
Surf Forecasts:
Ikumi Beach surf forecast from 6 Aug 2026:
- Best quality surf: Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 15s period, SE swell with cross-onshore winds.
- Most powerful swell: Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 15s period, SE swell with 12,071 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 3PM (local time) - 18ft (5.5m), 15s 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 Thursday (Aug 06) at 3PM. The primary swell is predicted to be 5.5m and 15s period with a secondary swell of 5.0m and 15s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 5.5m 15s 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 1.2m 13s period and expected on Sunday (Aug 09) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 6th Aug) | 18ft (5.5m) 15s |
| Best Surf | 3PM (Thu 6th Aug) | 18ft (5.5m) 15s |
| Most Powerful | 3PM (Thu 6th Aug) | 18ft (5.5m) 15s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here, with a look at what's on the table for our local stretch.
Honestly, I’m looking at a pretty tough run of surf for the next couple of weeks. The first real pulse of energy we see is a massive one, but it's way too big and messy for our setup. The biggest issue is the combination of those southeast swells and the onshore winds, making a mess of things.
We’re looking at Ikumi Beach here, and the water is sitting at 85°F with a temperature anomaly of 3°F, which is a touch warmer than normal for this time of year. Nice for a paddle, but it won't help the waves.
Let’s run through it. The first action kicks off Thursday, August 6th. We’ve got a monster swell building, 15 ft from the SE with a period of 14 seconds, pushing a massive amount of energy (8335). But the wind is cross-on from the ENE at 12 mph, and the wave comment says it all: "poor surf conditions." This is not for paddling. If you're into kiting, this setup looks way more interesting.
That afternoon, it gets even bigger. We’re talking 18 ft from the SE with a 15-second period, and the combined energy skyrockets (21621). The wind is up to 16 mph from the east. The report says it's "too big for this break." Only for absolute experts, and even then, it'll be a battle. This pattern of oversized, onshore slop continues through Friday, August 7th, with 13 ft and 12 ft swells, still cross-on and onshore winds.
We finally get a bit of a break over the weekend, but it’s nothing to write home about. Saturday, August 8th, the swell drops to 8 ft, and by Sunday, August 9th, it’s down to 5 ft. The wind eases, but it's still cross-on and the conditions are "marginal." The energy drops off (1189) but the quality just isn't there.
The standout session in this whole outlook, and the only time I’d really get excited, is Tuesday morning, August 11th. The swell is small at 4 ft from the S, with an 11-second period, and the energy is weak (433). But the wind is glass. Zero. Calm. "Expect good surf conditions." This is our window. It’s a small south swell, so it won't be a world-beater, but with glassy conditions, a longboard or a fish will be a joy. The crowd factor is "often" here, so expect company for that little window of clean, small waves.
Wednesday, August 12th, also has glassy conditions in the morning with 4 ft swell, but it’s even smaller. After that, we’re back into a long dry spell. From August 13th all the way through to August 21st, the swell is tiny, mostly under 3 ft, with weak energy (under 300) and mostly cross-on or onshore winds. There are a few glassy windows, like the morning of August 17th and 18th, but the swell is so small (2 ft) it’s barely surfable. It’s a long, quiet run.
The forecast hints at a very slight lift on August 19th with a 4 ft swell and glassy morning, but that's still a long way out and the confidence is low.
So, the call is simple. The only true standout is the glassy morning of Tuesday, August 11th for some clean, small waves. The rest of the 16-day window is a write-off for solid surf. It’s a blank run, but for this area, that’s not unusual when the wind and swell don't line up. Keep your eyes on that Tuesday morning.
Rusty.
Short Range ForecastHeavy rain (total 75mm), heaviest during Fri night. Warm (max 30°C on Thu morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 29°C on Mon afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 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 14 | SE 15 | SE 14 | SSE 13 | SSE 12 | S 12 | SSW 12 | SSW 12 | SSW 12 | SSW 13 | ESE 13 | SSE 11 | S 11 | SSE 11 | S 11 | S 11 | SSW 12 | SSW 12 | SSW 11 | S 10 | S 10 |
Wave Graph | |||||||||||||||||||||
8335 | 12071 | 8951 | 5051 | 3609 | 1880 | 1485 | 1051 | 725 | 679 | 980 | 486 | 319 | 366 | 482 | 396 | 532 | 404 | 297 | 127 | 125 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | glassy | glassy | cross | cross-off | glassy | glassy | cross-off |
High Tide | 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 | 4:48AM1.84m | 6:20PM1.88m | ||||||||
Low Tide | 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 | 11:36AM0.25m | 11:55PM0.95m | ||||||||
5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | |
— | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | |
mm | — | 3 | 10 | 7 | 10 | 30 | 10 | 4 | 1 | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 30 | 29 | 27 | 28 | 27 | 27 | 27 | 28 | 26 | 28 | 28 | 26 | 28 | 29 | 26 | 29 | 29 | 26 | 29 | 28 | 25 |
Feels °C | 31 | 30 | 30 | 32 | 30 | 31 | 30 | 32 | 31 | 31 | 31 | 31 | 30 | 32 | 31 | 32 | 32 | 30 | 32 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | SE 14 | SE 15 | SE 14 | SSE 13 | SSE 12 | S 12 | SSW 12 | SE 9 | SSW 12 | SSW 13 | SW 13 | SSE 11 | S 11 | SSE 11 | S 11 | S 11 | SSW 12 | SSW 12 | SSW 11 | S 10 | S 10 |
8335 | 9550 | 7338 | 5051 | 3126 | 1880 | 1485 | 631 | 725 | 679 | 388 | 486 | 319 | 366 | 482 | 396 | 532 | 404 | 297 | 127 | 125 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | E 15 | E 15 | E 15 | SSW 12 | SE 8 | SE 8 | E 13 | SSW 12 | SSW 12 | SSW 12 | SW 13 | SW 12 | E 11 | S 11 | S 11 | SSW 11 | SSW 11 |
— | — | — | — | 4 | 4 | 4 | 1051 | 349 | 160 | 329 | 239 | 264 | 260 | 132 | 118 | 37 | 38 | 39 | 109 | 78 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SE 17 | ESE 10 | E 13 | S 12 | ESE 13 | E 12 | E 12 | E 11 | E 11 | SE 13 | E 10 | E 10 | ESE 10 | ESE 10 |
— | — | — | — | — | — | — | 11 | 110 | 350 | 266 | 282 | 243 | 141 | 65 | 37 | 27 | 19 | 18 | 31 | 31 | |
Wind waves Height (m) Direction Period (s) | — | SE 15 | SE 14 | — | SSE 12 | ESE 9 | SE 9 | — | — | — | ESE 13 | — | — | ESE 4 | — | — | — | — | — | NE 3 | NE 3 |
— | 12071 | 8951 | — | 3609 | 719 | 673 | — | — | — | 980 | — | — | 21 | — | — | — | — | — | 1 | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 36 | 486 | 47 | 486 | 486 | 47 | 381 | 471 | 30 | 14 | 30 | 14 | 30 | 30 | 0 | 0 | 4 | 0 | 0 | 0 | 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.











