
Surf Forecasts:
Ikumi Beach surf forecast from 11 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 12AM (local time) - 3ft (0.9m), 10s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 12AM (local time) - 3ft (0.9m), 11s period, ESE swell with 202 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 12AM (local time) - 3ft (0.9m), 10s period with SSW 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 Wednesday (Aug 12) at 12AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.4m and 11s. 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 0.9m 11s and forecast to arrive on Monday (Aug 17) at 12AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Wednesday (Aug 12) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 12th Aug) | 3ft (0.9m) 10s |
| Best Surf | 12AM (Wed 12th Aug) | 3ft (0.9m) 10s |
| Most Powerful | 12AM (Mon 17th Aug) | 3ft (0.9m) 11s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’ll be straight with you – this stretch isn’t exactly firing, but we’ve got a few windows where the ocean might just give you a reason to paddle out. We’re looking at a 16-day run from now, and there’s a bit of a quiet gap early on, so let’s get into it.
For the first few days, starting Tuesday the 11th of August, we’ve got a tiny pulse of surf at Ikumi Beach, but it’s pretty marginal. You’re looking at a 3ft swell from the SSW with a 10-second period, which is a bit of a short-period wind swell, and the combined energy is only 320 – that’s weak. The wind is a light cross-onshore, so it’s not clean. Water temp is sitting at 84°, which is a touch warmer than normal for this time of year, so you can leave the wetsuit at home. Honestly, it’s not worth paddling out for.
Wednesday the 12th through to Friday the 14th are a write-off. Swell drops to 2ft or less, the wind is either onshore or cross-onshore, and the energy stays low (under 200). The reports call it poor surf conditions, and I’m not arguing. There’s a gap of several days here with no real recommendations.
Saturday morning the 15th of August might perk your ears up. It’s glassy early, with a little 2ft pulse from the S, 10-second period, and the energy climbs to 183. That’s still weak, but glassy conditions are a major positive – it’ll be clean. The swell is small, so you’ll need a high-performance board, but it’s surfable for a beginner. Still, nothing to write home about.
Now, Sunday the 16th of August is the standout in this entire forecast. Early morning, it’s glassy again, with a 3ft swell from the ESE, 10-second period, and energy of 279 – still moderate. The wind is glassy, the report says "expect good surf conditions," and honestly, that’s the best we’ve got. This is your session. The swell is small, so it’s fine for all levels, but don’t expect bombs. The break is inconsistent, so you’ll have to wait for sets, and crowds are often around, so get there early.
After that, things drop off again. Monday the 17th has a glassy morning with 2ft from the S, but the energy is only 127, and it’s just ordinary. From Tuesday the 18th through to the end of the week, the swell stays small, under 3ft, and the wind gets messy. There’s a brief moment on Thursday the 20th morning with a glassy 3ft from the SE, but energy is still only 127. It’s surfable, but very ordinary.
The second week gets a bit more interesting, but it’s less certain. Around Wednesday the 26th of August, we see a spike in the forecast: a 6ft swell from the SE with a 12-second period, and the energy jumps to 960 – that’s moderate to strong. But the wind is onshore, and the report calls it marginal. That swell is over 5ft, so it’s getting a bit big for beginners, and the period is long enough to suggest better shaped waves, but it’s coming straight onshore. This could be a better session for kite surfers than paddle surfers, given the wind and size. It’s a promising blip, but way out in the forecast, so take it with a grain of salt.
Rusty out.
Short Range ForecastModerate rain (total 17mm), heaviest on Wed night. Warm (max 29°C on Fri afternoon, min 22°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 26mm), heaviest during Sat night. Warm (max 29°C on Sat morning, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 10 | S 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | S 9 | ESE 6 | ESE 6 | ESE 11 | ESE 10 | ESE 10 | ESE 10 |
Wave Graph | |||||||||||||||||||
173 | 92 | 88 | 125 | 88 | 86 | 79 | 73 | 73 | 73 | 94 | 81 | 73 | 58 | 59 | 202 | 102 | 74 | 51 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-on | glassy | cross-on | cross-on | glassy | glassy | cross-on | glassy | glassy | cross-on | cross-on | cross-on | on | glassy | cross-on | cross | off |
High Tide | 4:48AM1.84m | 6:20PM1.88m | 5:34AM1.93m | 6:47PM1.92m | 6:16AM1.99m | 7:13PM1.94m | 6:56AM2.01m | 7:39PM1.94m | 7:35AM1.99m | 8:04PM1.93m | 8:16AM1.92m | 8:30PM1.90m | |||||||
Low Tide | 11:20PM1.07m | 11:36AM0.25m | 11:55PM0.95m | 12:13PM0.24m | 00:28AM0.83m | 12:48PM0.27m | 1:01AM0.72m | 1:20PM0.34m | 1:34AM0.63m | 1:52PM0.45m | 2:09AM0.57m | 2:23PM0.59m | 2:46AM0.55m | ||||||
— | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | |
6:53 | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:46 | — | |
mm | — | — | 2 | 6 | 5 | — | 2 | 1 | 1 | — | — | 2 | 14 | 2 | 3 | 5 | — | — | — |
Temp °C | 25 | 28 | 27 | 25 | 26 | 28 | 25 | 28 | 29 | 25 | 29 | 29 | 25 | 28 | 28 | 26 | 29 | 28 | 25 |
Feels °C | 28 | 29 | 30 | 30 | 30 | 30 | 29 | 31 | 32 | 30 | 32 | 32 | 29 | 32 | 32 | 31 | 32 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | S 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | S 9 | S 8 | S 9 | ESE 11 | ESE 10 | ESE 10 | ESE 10 |
173 | 88 | 88 | 125 | 88 | 86 | 79 | 73 | 73 | 73 | 94 | 81 | 73 | 52 | 59 | 202 | 102 | 74 | 51 | |
Swell 2 Height (m) Direction Period (s) | E 11 | SSW 10 | SSW 10 | SE 12 | SE 12 | ESE 4 | E 4 | ESE 5 | SE 11 | E 10 | SE 8 | SE 8 | SE 12 | ESE 10 | ESE 10 | S 9 | S 8 | S 9 | S 8 |
35 | 92 | 58 | 24 | 23 | 5 | 9 | 4 | 19 | 28 | 24 | 23 | 22 | 32 | 31 | 54 | 52 | 39 | 35 | |
Swell 3 Height (m) Direction Period (s) | NE 5 | E 10 | E 10 | E 10 | E 10 | E 9 | E 10 | E 9 | E 9 | SE 11 | E 10 | E 10 | ESE 9 | SE 12 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 |
5 | 19 | 8 | 8 | 7 | 7 | 16 | 15 | 14 | 19 | 30 | 17 | 15 | 49 | 45 | 42 | 42 | 42 | 30 | |
Wind waves Height (m) Direction Period (s) | N 4 | — | — | SE 3 | ESE 3 | — | — | — | SE 4 | — | — | E 5 | ESE 5 | ESE 6 | ESE 6 | SE 5 | — | — | — |
24 | — | — | 3 | 2 | — | — | — | 4 | — | — | 13 | 39 | 58 | 47 | 17 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 33 | 0 | 30 | 516 | 0 | 0 | 4 | 0 | 0 | 33 | 30 | 30 | 371 | 0 | 4 | 4 | 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.











