Surf Forecasts:
Ikumi Beach surf forecast from 2 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 6AM (local time) - 10ft (3.0m), 9s period, SE swell with onshore winds.
- Most powerful swell: Wednesday 9 Sep, 12AM (local time) - 16ft (5.0m), 12s period, SE swell with 7,713 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 12AM (local time) - 3.5ft (1.1m), 8s period with SSE 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 (Sep 03) at 12AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.7m and 4s is also forecast. 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 5.0m 12s and forecast to arrive on Wednesday (Sep 09) at 12AM. Winds are predicted to be 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 Friday (Sep 04) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 3rd Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 6AM (Tue 8th Sep) | 10ft (3.0m) 9s |
| Most Powerful | 12AM (Wed 9th Sep) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what’s coming for the next couple of weeks.
It’s a slow start, nothing worth paddling for until Thursday morning, September 3rd. The water is a warm 85°, which is a touch warmer than normal for this time of year, so you’ll be fine in a shorty or just trunks.
The best bet on the table is Thursday morning, September 3rd, at Ikumi Beach. Swell is a clean 4 ft from the SSE with a 8-second period, and the wind is glassy (NNE at 3 mph). That’s the kind of smooth, clean surface that’ll make for a fun, easy session. The combined energy is 214 – low, but with the glassy conditions, it’ll be a treat.
Friday morning, September 4th, the swell jumps to 6 ft from the SSE, but the wind is cross-on (NE at 3 mph) and it’s heavy rain. The energy is moderate at 684, but the rain and wind will spoil the fun.
From Saturday the 5th through Tuesday the 8th, it gets messy. Swell builds but the wind is moderate to fresh cross-shore or cross-on, making the surface lumpy. Swell heights hit 8 ft on Sunday the 6th, but with NE winds at 15-16 mph, the conditions are a write-off. The energy is strong (1098 on Saturday afternoon), but the wind is no good.
Then, on Tuesday the 8th of September, the swell gets big. We’re looking at 12 ft from the SE with an 11-second period and a very strong energy reading of 2866. That’s too big for this break, and it’s for experts only. The wind is light from the ESE, which helps, but it’s a beast. Wednesday the 9th is similar – 12 ft to 10 ft with glassy winds in the morning, but again, it’s just too big for Ikumi Beach.
We get a lull from Thursday the 10th to Monday the 14th, with small, poor conditions. Then Tuesday the 15th of September morning offers a glassy 3 ft from the ESE with a 9-second period – a clean, fun little wave. Not a standout, but a nice session.
The real standout in the second week is Wednesday the 16th of September morning. The swell is back up to 12 ft from the SE with a 12-second period, and the wind is glassy (SSE at 3 mph). The energy is massive at 3032. This is a powerful, long-period groundswell, but it’s too big for Ikumi Beach and only for the brave. For experts, it’s a promise of a big, clean day, but it’s a long way out so don’t get your hopes up too high.
Thursday the 17th of September morning sees a drop to 8 ft from the SE with a 12-second period, but the wind turns cross-shore (NNE at 12 mph), so it’ll be a bit sloppy. The energy is still high at 1995, but the quality is marginal.
For the average surfer, Thursday morning the 3rd is your best call for clean, fun waves. For the big-wave crew, keep an eye on Wednesday the 16th.
Rusty.
Short Range ForecastHeavy rain (total 159mm), heaviest during Fri morning. Warm (max 30°C on Wed afternoon, min 21°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 326mm), heaviest during Mon night. Warm (max 27°C on Sat afternoon, min 23°C on Sat night). Winds decreasing (fresh winds from the E on Mon afternoon, calm by Tue morning). | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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) | SSE 9 | SSE 8 | SSE 8 | SSE 10 | S 10 | SSE 10 | S 10 | S 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | SE 8 | SE 9 | SE 11 | SE 11 | SE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 206 | 164 | 157 | 294 | 408 | 631 | 464 | 194 | 301 | 695 | 878 | 790 | 908 | 662 | 865 | 571 | 542 | 2866 | 3716 | 7713 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | cross | cross | cross-on | cross | cross-on | cross | cross | cross | cross-on | cross | cross | on | cross-on | cross-on | on | cross-on | off |
High Tide | 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 | 4:50PM1.74m | ||||||||
Low Tide | 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 | 9:50AM0.50m | 10:25PM1.08m | ||||||||
 |  |  | |  |  | |  |  | |  | | | |  | | | | | | |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — |
 | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:20 | — |
mm | — | 4 | 4 | — | 24 | 59 | 34 | 34 | — | — | 9 | 25 | 17 | 50 | 8 | 29 | 179 | 9 | 3 | 3 |
Temp °C | 30 | 27 | 26 | 27 | 24 | 23 | 22 | 22 | 28 | 27 | 24 | 23 | 23 | 26 | 26 | 26 | 27 | 27 | 28 | 26 |
Feels °C | 34 | 33 | 30 | 30 | 26 | 27 | 22 | 23 | 27 | 26 | 25 | 23 | 24 | 27 | 26 | 27 | 28 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SSE 8 | SSE 8 | SSE 10 | S 10 | SSE 10 | S 10 | S 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | S 9 | ESE 9 | SSW 8 | SE 8 | SE 9 | — | — | SE 12 |
| kJ | 206 | 164 | 157 | 294 | 408 | 631 | 464 | 194 | 301 | 695 | 878 | 790 | 56 | 662 | 14 | 571 | 542 | — | — | 6858 |
Swell 2 Height (m) Direction Period (s) | E 11 | ESE 11 | ESE 10 | ESE 10 | SE 10 | E 9 | ESE 7 | ESE 8 | SSW 10 | SSW 10 | S 9 | S 8 | — | SSW 9 | — | E 9 | SSW 8 | — | — | — |
| kJ | 58 | 37 | 33 | 33 | 15 | 7 | 64 | 154 | 292 | 375 | 154 | 57 | — | 25 | — | 74 | 28 | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 10 | SE 10 | ESE 10 | E 9 | — | SW 11 | E 16 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 18 | 18 | 16 | 15 | 18 | 7 | — | 61 | 5 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | E 4 | E 4 | NNE 2 | NE 4 | NNE 4 | NE 5 | NE 4 | NNE 4 | NNE 4 | — | — | ESE 9 | — | ESE 8 | — | E 6 | SE 11 | SE 11 | SE 12 |
| kJ | — | 16 | 8 | 1 | 26 | 39 | 61 | 4 | 31 | 28 | — | — | 908 | — | 865 | — | 171 | 2866 | 3716 | 7713 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 33 | 0 | 0 | 8 | 8 | 8 | 30 | 8 | 30 | 47 | 8 | 36 | 36 | 30 | 272 | 371 | 30 | 30 | 4 | 4 |
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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