Surf Forecasts:
Ikumi Beach surf forecast from 4 Sep 2026:
- Best quality surf: Sunday 6 Sep, 3PM (local time) - 10ft (3.0m), 10s period, ESE swell with cross-shore winds.
- Most powerful swell: Sunday 6 Sep, 6PM (local time) - 10ft (3.0m), 11s period, ESE swell with 1,887 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 3PM (local time) - 10ft (3.0m), 10s period with ESE 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 Sunday (Sep 06) at 3PM. The primary swell is predicted to be 3.0m and 10s period with a secondary swell of 0.6m and 10s. Another secondary swell of 0.8m and 4s is also forecast. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 3.0m 11s and forecast to arrive on Sunday (Sep 06) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Sunday (Sep 06) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Sun 6th Sep) | 10ft (3.0m) 10s |
| Best Surf | 3PM (Sun 6th Sep) | 10ft (3.0m) 10s |
| Most Powerful | 6PM (Sun 6th Sep) | 10ft (3.0m) 11s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what Ikumi Beach has cooking.
The first few days are a slog, with nothing really worth rushing for. But there’s a proper little window early next week that’s got my attention.
Saturday 5th September is flat and soft. You’re looking at knee-high waves around 3ft from the SSW, with a light cross breeze. Combined energy is 217 (moderate). The water is sitting at 85°F, which feels a touch warmer than normal for this time of year – so it’s not all bad.
Sunday 6th September builds fast. By the morning, the swell hits 7ft from the ESE, with a short period and a moderate cross-shore wind. Energy jumps to 719 (strong), but the wind is going to mess it up. The afternoon gets even bigger – 10ft from the ESE, 10-second period, and energy at 1633 (very strong). That’s well over 8ft – only for experts, and even then the heavy rain and strong wind make it a mess.
Monday 7th September is your day. The morning brings a 6ft SE swell with a 10-second period and a clean cross-offshore breeze. Energy is 865 (strong). The afternoon gets even cleaner, with the wind dropping to about 6 mph from the north, still cross-off. The swell holds at 6ft, period at 9 seconds. The forecast says "expect very good surf conditions." This is the highlight of the whole 16 days. Ikumi Beach faces the SE, which is exactly where this swell is coming from. It’s an inconsistent spot and crowds are likely, so get there early.
Tuesday 8th September backs off to chest-high 4–4ft from the SE, with gentle cross-shore wind and moderate energy (454, 433). Surfable, but average.
From Wednesday 9th September onward, the swell fades steadily. Heights drop from 6ft down to around 1ft, periods shrink to 8 seconds, and energy gets weak (down to 24). Winds stay cross or cross-on. The second week is mostly flat and glassy, with tiny waves under 2ft. There’s a long-period groundswell on the 13th with a 14-second period, but it’s only 1ft – not enough to ride.
Tuesday 15th September offers a small pulse: a 5ft E swell in the morning, then glassy 4ft E swell in the afternoon (399 energy). Might be okay for a quick session, but it’s nowhere near the quality of Monday the 7th.
So, the only real standout is Monday the 7th. That’s the one to aim for.
Rusty.
Short Range ForecastHeavy rain (total 127mm), heaviest during Sun afternoon. Warm (max 25°C on Sat night, min 22°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Tue morning. Warm (max 27°C on Wed morning, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 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) | SSW 9 | SSW 9 | E 7 | ESE 9 | ESE 10 | SE 10 | SE 10 | SE 9 | SE 10 | SE 9 | SE 9 | SE 9 | SSE 9 | SSE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 8 | SSE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 138 | 106 | 248 | 705 | 1522 | 1507 | 612 | 561 | 499 | 241 | 287 | 343 | 490 | 307 | 211 | 206 | 154 | 113 | 64 | 58 | 57 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross | cross | cross-off | cross | cross | cross | cross | cross | cross | glassy | cross-on | glassy |
High Tide | 1:30PM1.45m | 10:59PM1.59m | 3:29PM1.53m | 1:00AM1.54m | 4:18PM1.64m | 2:46AM1.61m | 4:50PM1.74m | 3:53AM1.73m | 5:17PM1.81m | 4:44AM1.86m | 5:43PM1.87m | 5:27AM1.96m | 6:07PM1.91m | ||||||||
Low Tide | 5:24PM1.36m | 7:18AM0.66m | 8:15PM1.36m | 8:48AM0.59m | 9:40PM1.24m | 9:50AM0.50m | 10:25PM1.08m | 10:37AM0.43m | 11:00PM0.91m | 11:16AM0.39m | 11:31PM0.75m | 11:51AM0.38m | 00:02AM0.61m | ||||||||
 |  |  |  |  |  | |  |  | | |  | |  | | | | | | | | |
 | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:20 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — |
mm | — | 1 | 1 | 9 | 53 | 60 | 2 | 1 | — | 1 | — | — | — | — | — | — | — | 3 | 1 | 1 | — |
Temp °C | 24 | 24 | 25 | 25 | 23 | 24 | 24 | 25 | 24 | 25 | 26 | 25 | 27 | 27 | 24 | 24 | 25 | 23 | 25 | 24 | 24 |
Feels °C | 26 | 26 | 26 | 26 | 23 | 25 | 24 | 27 | 26 | 27 | 28 | 27 | 31 | 28 | 24 | 24 | 27 | 26 | 30 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 9 | ESE 7 | ESE 9 | ESE 10 | SE 10 | SE 10 | SE 9 | SE 10 | SE 9 | SE 9 | SE 9 | SSE 9 | SSE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 8 | SSE 7 |
| kJ | 138 | 106 | 108 | 705 | 1522 | 1507 | 612 | 561 | 499 | 241 | 287 | 343 | 490 | 307 | 211 | 206 | 154 | 113 | 64 | 58 | 57 |
Swell 2 Height (m) Direction Period (s) | ESE 7 | ESE 7 | SSW 8 | SSW 9 | SSE 10 | E 10 | E 9 | S 11 | S 11 | S 10 | S 10 | S 10 | E 18 | E 18 | S 9 | E 16 | E 15 | E 15 | E 9 | SE 10 | E 7 |
| kJ | 62 | 70 | 57 | 8 | 82 | 988 | 139 | 21 | 112 | 146 | 117 | 122 | 6 | 6 | 6 | 5 | 4 | 17 | 24 | 14 | 8 |
Swell 3 Height (m) Direction Period (s) | SE 9 | E 13 | E 13 | S 8 | SSW 9 | — | SW 10 | S 10 | SSW 10 | SSW 11 | — | E 19 | — | — | E 16 | — | E 18 | ESE 11 | SE 9 | E 7 | E 15 |
| kJ | 12 | 3 | 3 | 6 | 8 | — | 4 | 54 | 11 | 12 | — | 7 | — | — | 5 | — | 6 | 12 | 14 | 8 | 39 |
Wind waves Height (m) Direction Period (s) | NE 3 | NE 3 | E 7 | NNE 4 | NNE 4 | NNE 5 | NNE 6 | NNE 5 | NE 5 | NE 5 | NE 4 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NE 5 | NNE 4 | NNE 4 | NE 4 | NNE 4 |
| kJ | 5 | 3 | 248 | 7 | 21 | 125 | 114 | 50 | 79 | 55 | 29 | 15 | 42 | 48 | 86 | 46 | 25 | 8 | 7 | 13 | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 8 | 8 | 14 | 30 | 47 | 30 | 30 | 0 | 0 | 30 | 30 | 0 | 8 | 30 | 30 | 30 | 8 | 8 | 0 | 8 | 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.
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