Surf Forecasts:
Ikumi Beach surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 3PM (local time) - 10ft (3.0m), 8s period, SSE swell with cross-onshore winds.
- Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 8ft (2.5m), 9s period, S swell with 1,171 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 9PM (local time) - 6ft (1.8m), 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 Tuesday (Sep 08) at 9PM. The primary swell is predicted to be 1.8m and 9s period with a secondary swell of 1.2m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 2.5m 9s and forecast to arrive on Wednesday (Sep 09) at 12PM. 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 3s period and expected on Tuesday (Sep 08) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 8th Sep) | 6ft (1.8m) 9s |
| Best Surf | 3PM (Wed 9th Sep) | 10ft (3.0m) 8s |
| Most Powerful | 12PM (Wed 9th Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Righto, surf is looking a bit of a mixed bag here, but there’s a proper highlight to get keen on if you’ve got patience. Let’s get into it.
The first real recommendation doesn’t pop up until Wednesday September 9th at Ikumi Beach. The start of the week is flat and messy, so you’re best sitting it out. Wednesday morning brings a jump in energy with a solid 8ft swell pushing in from the SSE, period around 9 seconds. The combined energy is strong at (1915). Winds are glassy – that’s the kind of clean surface you dream about. This is top-shelf for experienced surfers; the size is too much for beginners. Water temp is about average for this time of year, nothing wild.
The crowd situation at Ikumi Beach can get busy, so expect company if you paddle out on that Wednesday morning. The swell direction (SSE) isn’t a perfect match for the optimum (ESE), but with glassy conditions and that much energy, it’s still the standout of the whole run.
By Thursday September 10th, it drops right back to 4ft and the wind turns cross, so the quality fades. Friday September 11th has a tiny 3ft SSE swell with glassy conditions in the morning – surfable but pretty ordinary. The weekend is tiny and not worth a mention.
Then, hold onto your board. The real highlight lands on Monday September 21st into Tuesday September 22nd. Monday afternoon brings a serious pulse: 8ft swell from the SE, period stretching out to a very long 16 seconds, energy hitting 3124 – that’s powerful, groundswell energy. Winds go glassy again. This is another expert-only zone, especially with that size and period. At a beach break like Ikumi, that long period can make waves break a bit straight, but the raw power and clean surface are hard to ignore. Tuesday September 22nd pumps even bigger at 10ft from the SE with the same 16-second period and energy skyrocketing to 4303. Glassy morning. This is absolute big-wave territory, only for the well-prepared crew. The cross-onshore wind on Tuesday arvo will chop it up a bit, so get on it early.
Wednesday September 23rd holds similar size (10ft) but with cross-shore wind, so it’s less clean.
So, in short: if you’re experienced, Wednesday September 9th morning is a proper clean session. But the real bomb is Monday September 21st afternoon and Tuesday September 22nd morning – that’s the one to circle on the calendar. Beginners should sit it all out; it’s too big and powerful for a safe paddle.
Rusty.
Short Range ForecastHeavy rain (total 55mm), heaviest during Tue morning. Warm (max 28°C on Wed morning, min 22°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat afternoon. Warm (max 29°C on Sun morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 8 | S 9 | S 9 | S 9 | SSE 9 | SSE 8 | SSE 8 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | ESE 10 | ESE 9 | ESE 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 313 | 287 | 427 | 544 | 1081 | 1102 | 313 | 247 | 228 | 188 | 126 | 117 | 76 | 49 | 36 | 35 | 47 | 55 | 101 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | glassy | glassy | cross-on | cross-off | cross | cross-on | cross | glassy | cross-off | glassy | glassy | cross | glassy | cross-on | on | glassy |
High Tide | 2:46AM1.61m | 4:50PM1.74m | 3:53AM1.73m | 5:17PM1.81m | 4:44AM1.86m | 5:43PM1.87m | 5:27AM1.96m | 6:07PM1.91m | 6:07AM2.02m | 6:32PM1.94m | 6:45AM2.04m | 6:56PM1.95m | |||||||
Low Tide | 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 | 12:23PM0.42m | 00:34AM0.49m | 12:54PM0.50m | 1:06AM0.40m | ||||||
 |  |  |  | | | |  | |  | | |  | | | |  | |  | |
 | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:21 | — | 6:20 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — |
mm | 2 | 10 | 11 | 7 | 8 | 11 | 4 | 1 | 1 | — | 1 | 2 | — | 1 | 3 | — | — | — | 2 |
Temp °C | 26 | 26 | 26 | 26 | 28 | 27 | 23 | 26 | 26 | 24 | 27 | 27 | 25 | 28 | 28 | 26 | 29 | 29 | 26 |
Feels °C | 30 | 31 | 31 | 31 | 34 | 32 | 25 | 29 | 29 | 27 | 32 | 31 | 29 | 33 | 33 | 32 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 8 | S 9 | S 9 | S 9 | SSE 9 | SSE 9 | SSE 8 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | ESE 10 | ESE 9 | ESE 9 | SE 5 |
| kJ | 313 | 287 | 427 | 544 | 828 | 880 | 313 | 247 | 228 | 188 | 126 | 117 | 76 | 49 | 36 | 35 | 47 | 55 | 35 |
Swell 2 Height (m) Direction Period (s) | S 10 | SE 8 | SE 8 | ESE 8 | E 18 | E 18 | E 16 | S 8 | E 15 | ESE 11 | E 15 | E 14 | ESE 10 | SE 10 | SE 10 | SSW 7 | S 7 | SE 4 | ESE 9 |
| kJ | 225 | 196 | 147 | 175 | 6 | 6 | 5 | 5 | 4 | 12 | 17 | 15 | 19 | 24 | 25 | 17 | 15 | 4 | 101 |
Swell 3 Height (m) Direction Period (s) | SW 11 | SE 10 | SE 10 | — | — | E 18 | — | E 16 | E 18 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | SE 6 | E 13 | S 7 | S 10 |
| kJ | 29 | 26 | 49 | — | — | 6 | — | 5 | 6 | 17 | 65 | 60 | 36 | 31 | 32 | 10 | 31 | 15 | 50 |
Wind waves Height (m) Direction Period (s) | NE 3 | NNE 3 | NNE 3 | — | SSE 9 | SSE 8 | NNE 5 | NNE 5 | NE 4 | NNE 4 | NE 4 | NE 3 | NNE 3 | — | — | — | SE 3 | — | — |
| kJ | 5 | 4 | 4 | — | 1081 | 1102 | 74 | 33 | 22 | 6 | 5 | 2 | 1 | — | — | — | 2 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 8 | 8 | 8 | 0 | 0 | 4 | 0 | 8 | 8 | 8 | 0 | 0 | 0 | 0 | 4 | 0 | 4 | 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.
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