Surf Forecasts:
Ikumi Beach surf forecast from 1 Sep 2026:
- Best quality surf: Saturday 5 Sep, 6PM (local time) - 10ft (3.0m), 8s period, E swell with cross-shore winds.
- Most powerful swell: Tuesday 8 Sep, 6AM (local time) - 15ft (4.5m), 11s period, SE swell with 4,595 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 9PM (local time) - 3ft (0.9m), 8s 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 Tuesday (Sep 01) at 9PM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.5m and 12s. 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 4.5m 11s and forecast to arrive on Tuesday (Sep 08) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Tuesday (Sep 08) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 1st Sep) | 3ft (0.9m) 8s |
| Best Surf | 6PM (Sat 5th Sep) | 10ft (3.0m) 8s |
| Most Powerful | 6AM (Tue 8th Sep) | 15ft (4.5m) 11s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's coming our way for Ikumi Beach.
First off, the water is a touch warmer than normal for this time of year, sitting at 84°F.
We've got a bit of a slow start. The first few days are a write-off, with poor conditions and no real surf to speak of. Tuesday through Thursday morning are all about small, weak, and messy waves. The combined energy barely gets going, with values like 144 (weak) on Tuesday. You're better off waiting.
Things start to get interesting from Thursday afternoon. We see a bump in energy, hitting 429 (moderate) with a 5ft SSE swell. The wind is cross, but the period is a short 10 seconds, so it's not going to be world-class. Friday brings a bigger swell, 6ft in the morning and 6ft in the afternoon, from the SSE. The energy is ramping up (657 to 709 - moderate), but the wind is cross and on Friday afternoon it's a moderate breeze with a cross-chop. It's a bit of a mess.
The real standout is the following Tuesday, the 8th of September. We've got a massive 15ft SE swell, with an incredible 11-second period. The combined energy is a whopping 4393 (strong) in the morning. The wind is glassy, completely calm. The problem is, this is way too big for Ikumi Beach. This is expert-only territory, and even then, it's predicted to be too big for the break. It's a spectacle to watch, not for a paddle.
After that, the swell stays big but the wind goes onshore and messy through the 10th and 11th, making it a total loss.
The next real chance for a decent surf comes on Saturday the 12th of September. The swell drops to 8ft from the SE, with an 11-second period, and the energy is still strong at 1302. The wind is glassy in the morning. This is excellent surf conditions for experienced surfers – the swell is over 8ft, so it's still big, but the glassy conditions will make it as clean as it gets. It's the best paddle-surfing option on offer.
Sunday the 13th is smaller, around 6ft, with a cross-onshore wind, so it's a step down. Monday the 14th sees a return to cleaner conditions with a 4ft SSE swell and glassy wind in the morning. That's a good, manageable size for a fun session.
The very end of the run, Tuesday the 15th, has a tiny 3ft swell with glassy conditions, and then a super-long period (16 seconds) 2ft swell. That long period is interesting, but the size is so small it's probably not going to do much at a beach break like Ikumi.
So, bottom line: for the next 16 days, the best bet is the glassy, big swell on Saturday the 12th of September. If you're an expert, that's your window. Everyone else, look at Monday the 14th for a cleaner, smaller session.
Rusty.
Short Range ForecastHeavy rain (total 81mm), heaviest during Thu morning. Warm (max 30°C on Tue afternoon, min 22°C on Thu morning). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 129mm), heaviest during Fri night. Warm (max 28°C on Sat morning, min 21°C on Fri night). Mainly fresh winds. | |||||||||||||||||||
Tue 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | ||||||||||||||
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) | E 12 | S 8 | SSE 9 | SSE 9 | S 8 | SSE 8 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | ESE 8 | SSW 10 | ESE 8 | ESE 9 | ESE 8 | ESE 9 | E 10 | ESE 8 | ESE 9 | SE 11 |
Wave Graph | ||||||||||||||||||||
80 | 105 | 189 | 206 | 147 | 185 | 370 | 838 | 606 | 474 | 186 | 214 | 256 | 530 | 549 | 560 | 2309 | 636 | 777 | 3250 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-on | on | glassy | cross-off | cross | cross | cross | cross | cross-on | cross-off | cross | cross | cross | cross-on | cross | cross | cross-off | off |
High Tide | 8:20PM1.90m | 9:13AM1.77m | 8:48PM1.85m | 10:06AM1.62m | 9:18PM1.78m | 11:21AM1.49m | 9:56PM1.69m | 1:30PM1.45m | 10:59PM1.59m | 3:29PM1.53m | 1:00AM1.54m | 4:18PM1.64m | 2:46AM1.61m | |||||||
Low Tide | 2:49AM0.46m | 2:53PM0.90m | 3:32AM0.50m | 3:25PM1.07m | 4:25AM0.57m | 4:05PM1.22m | 5:39AM0.64m | 5:24PM1.36m | 7:18AM0.66m | 8:15PM1.36m | 8:48AM0.59m | 9:40PM1.24m | ||||||||
— | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | |
6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | |
mm | — | — | 3 | 1 | 16 | 30 | 19 | 7 | 5 | 30 | 88 | 2 | — | — | — | — | 7 | 2 | — | — |
Temp °C | 30 | 26 | 28 | 28 | 26 | 23 | 24 | 24 | 25 | 24 | 23 | 28 | 28 | 24 | 26 | 27 | 25 | 25 | 26 | 24 |
Feels °C | 33 | 32 | 31 | 32 | 31 | 25 | 27 | 27 | 28 | 25 | 22 | 25 | 27 | 24 | 26 | 28 | 26 | 24 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 8 | SSE 9 | SSE 9 | S 8 | SSE 8 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | ESE 8 | SSW 10 | ESE 8 | ESE 9 | ESE 8 | ESE 9 | ESE 10 | ESE 8 | ESE 9 | SE 11 |
42 | 105 | 189 | 206 | 147 | 185 | 370 | 838 | 606 | 474 | 186 | 214 | 256 | 530 | 549 | 560 | 880 | 636 | 777 | 3250 | |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 11 | E 11 | ESE 11 | ESE 10 | ESE 10 | ESE 10 | E 10 | S 9 | SSE 8 | SSE 8 | S 9 | S 8 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSE 11 | SW 8 |
80 | 70 | 61 | 59 | 37 | 33 | 33 | 18 | 18 | 199 | 153 | 103 | 240 | 66 | 55 | 45 | 26 | 25 | 307 | 3 | |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 10 | SE 10 | SE 11 | SE 11 | SE 10 | SE 10 | — | E 10 | E 10 | SSW 9 | ESE 8 | — | — | — | — | — | — | SSW 9 | — |
22 | 15 | 17 | 18 | 18 | 15 | 16 | — | 18 | 18 | 119 | 110 | — | — | — | — | — | — | 15 | — | |
Wind waves Height (m) Direction Period (s) | — | — | ENE 6 | ESE 4 | E 5 | E 4 | NNE 3 | NE 4 | NE 4 | NNE 4 | NNE 4 | NNE 3 | NE 3 | — | NE 4 | — | E 10 | NE 4 | NNE 4 | NE 4 |
— | — | 6 | 10 | 11 | 13 | 10 | 16 | 15 | 18 | 12 | 8 | 3 | — | 7 | — | 2309 | 13 | 17 | 29 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 0 | 30 | 30 | 0 | 0 | 8 | 8 | 30 | 30 | 15 | 8 | 30 | 8 | 30 | 14 | 14 | 30 | 30 | 10 |
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.











