
Surf Forecasts:
Ikumi Beach surf forecast from 12 Sep 2026:
- Best quality surf: Saturday 19 Sep, 9AM (local time) - 11ft (3.5m), 15s period, ESE swell with cross-shore winds.
- Most powerful swell: Saturday 19 Sep, 3PM (local time) - 16ft (5.0m), 14s period, ESE swell with 9,669 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 3PM (local time) - 2ft (0.6m), 7s 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 Saturday (Sep 12) at 3PM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.4m and 10s. 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 14s and forecast to arrive on Saturday (Sep 19) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Sat 12th Sep) | 2ft (0.6m) 7s |
| Best Surf | 9AM (Sat 19th Sep) | 11ft (3.5m) 15s |
| Most Powerful | 3PM (Sat 19th Sep) | 16ft (5.0m) 14s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the cards for Ikumi Beach over the next couple of weeks.
Right off the bat, we’ve got a bit of a slow start. The surf coming in is small and weak, with combined energy values sitting in the low to mid three digits (104-153), meaning there’s not much punch. The first few days from Saturday the 12th through Monday the 14th have waves around 2ft to 3ft from the S and SE, with periods around 7-9 seconds. It’s mostly poor or just surfable with very ordinary conditions, so you’re not missing much if you wait.
Tuesday the 15th is where things start to perk up. The swell pushes to 4ft from the SE with a 9-second period, and the combined energy climbs to a moderate 216 in the morning and 201 in the afternoon. The wind goes glassy, which is a major positive. The water temperature is a warm 82°, sitting about average for this time of year. Ikumi Beach is an inconsistent beginner spot, and the crowds are often around, but if you want clean, manageable waves, Tuesday morning and afternoon are your best bets in this first week.
Wednesday the 16th drops back a touch with 3ft ESE swell and glassy conditions again, but the energy dips to 108, so it’s just ordinary.
Now, hold onto your board—things go big and mean from Friday the 18th onward. On the 18th, we see 7ft E swell with an 8-second period and energy jumping to 770-858, but the wind is cross-onshore, making it choppy. Then Saturday the 19th and Sunday the 20th see a huge groundswell from the ESE and SE, with heights of 12ft to 16ft and periods of 14 to 15 seconds. The combined energy hits massive numbers like 4990 and 16439. This is well over 8ft, so it’s expert territory only. The swell is also very long-period, which tends to break straight at beach breaks, and since Ikumi is exposed and inconsistent, this setup looks more interesting for kite surfing than paddle surfing. The wind is cross to cross-onshore, so not clean.
The standout in the second week lands on Tuesday the 22nd. The swell drops to a much more manageable 8ft from the SSE, period around 9 seconds, and the combined energy is a solid 801. The wind goes dead calm and glassy, which is a major positive for clean conditions. For experienced surfers who can handle the size, this is the best window, but keep in mind the crowds can often be a thing here.
After that, the swell crashes down again. Wednesday the 23rd and Thursday the 24th bring poor, messy conditions, though Thursday afternoon the 24th shows a glass-off with 6ft E swell and energy at 725, which could offer a few decent ones if you’re patient. The final few days from the 25th to the 27th fade into tiny, weak, and poor surf.
So, overall: the best of the first week is Tuesday the 15th with clean, small waves. Your one true standout in the whole run is Tuesday the 22nd at Ikumi Beach – size, glassy wind, and decent energy, but it’s for experts only given the 8ft swell.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Mon afternoon. Warm (max 29°C on Sun morning, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Wed morning. Warm (max 28°C on Tue morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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) | S 7 | S 7 | E 14 | ESE 9 | ESE 9 | SE 9 | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 | SE 9 | ESE 6 | E 8 | E 8 | SE 16 |
Wave Graph | |||||||||||||||||||||
47 | 33 | 35 | 32 | 54 | 145 | 135 | 138 | 181 | 198 | 186 | 138 | 101 | 99 | 99 | 77 | 75 | 197 | 513 | 579 | 625 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | glassy | cross-on | glassy | glassy | cross | glassy | glassy | glassy | glassy | glassy | glassy | glassy | cross-on | cross-on | cross-off | cross-on | cross-on | cross |
High Tide | 6:32PM1.94m | 6:45AM2.04m | 6:56PM1.95m | 7:23AM2.02m | 7:21PM1.95m | 8:01AM1.94m | 7:45PM1.92m | 8:43AM1.83m | 8:12PM1.88m | 9:30AM1.70m | 8:41PM1.81m | 10:31AM1.56m | 9:14PM1.72m | ||||||||
Low Tide | 12:23PM0.42m | 00:34AM0.49m | 12:54PM0.50m | 1:06AM0.40m | 1:24PM0.61m | 1:39AM0.36m | 1:53PM0.74m | 2:15AM0.36m | 2:23PM0.88m | 2:54AM0.40m | 2:54PM1.03m | 3:40AM0.48m | 3:29PM1.18m | ||||||||
5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | |
— | 6:14 | — | — | 6:13 | — | — | 6:12 | — | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:06 | — | |
mm | 1 | 2 | 3 | — | — | — | 2 | 2 | 1 | — | 1 | 1 | 4 | 3 | 5 | 2 | 4 | — | — | 1 | — |
Temp °C | 27 | 26 | 25 | 29 | 29 | 25 | 28 | 28 | 25 | 28 | 26 | 25 | 24 | 24 | 23 | 26 | 26 | 24 | 27 | 26 | 25 |
Feels °C | 31 | 31 | 30 | 32 | 33 | 30 | 32 | 31 | 29 | 31 | 30 | 29 | 28 | 29 | 27 | 30 | 29 | 27 | 30 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | ESE 9 | ESE 9 | SE 9 | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 | SE 9 | E 12 | ESE 8 | ESE 8 | SE 16 |
47 | 33 | 15 | 32 | 54 | 145 | 135 | 138 | 181 | 198 | 186 | 138 | 101 | 99 | 99 | 77 | 75 | 3 | 243 | 234 | 625 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 10 | S 7 | E 13 | E 13 | E 13 | E 12 | E 12 | S 7 | E 13 | E 13 | E 12 | S 7 | E 13 | E 12 | E 12 | S 6 | SE 19 | SE 16 | S 9 |
24 | 25 | 35 | 22 | 31 | 29 | 13 | 12 | 12 | 1 | 14 | 12 | 3 | 1 | 3 | 3 | 3 | 1 | 14 | 43 | 2 | |
Swell 3 Height (m) Direction Period (s) | E 13 | ESE 4 | E 14 | ESE 4 | S 7 | S 6 | S 7 | S 7 | S 7 | E 15 | S 6 | S 7 | E 14 | S 7 | S 7 | S 7 | S 7 | — | — | S 10 | — |
31 | 4 | 35 | 6 | 8 | 3 | 3 | 3 | 1 | 17 | 1 | 1 | 4 | 1 | 1 | 1 | 1 | — | — | 2 | — | |
Wind waves Height (m) Direction Period (s) | NE 3 | — | ESE 5 | SE 4 | SE 4 | E 3 | — | — | — | — | — | — | — | — | — | — | ENE 2 | ESE 6 | E 8 | E 8 | ESE 9 |
2 | — | 12 | 7 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 197 | 513 | 579 | 360 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 8 | 0 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 30 | 0 | 8 | 33 | 8 |
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.










