Surf Forecasts:
Ikumi Beach surf forecast from 12 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 6PM (local time) - 2.5ft (0.7m), 9s period, S swell with glassy winds.
- Most powerful swell: Monday 17 Aug, 3AM (local time) - 3ft (0.9m), 10s period, ESE swell with 148 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 6PM (local time) - 2.5ft (0.7m), 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 Wednesday (Aug 12) at 6PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.5m 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 0.9m 10s and forecast to arrive on Monday (Aug 17) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 10s period and expected on Thursday (Aug 13) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Wed 12th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 6PM (Wed 12th Aug) | 2.5ft (0.7m) 9s |
| Most Powerful | 3AM (Mon 17th Aug) | 3ft (0.9m) 10s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, let’s look at what’s coming for Ikumi Beach over the next couple of weeks.
To be straight with you, the first week or so is pretty flat and weak. A few mornings go glassy, but the swell is only hanging around 2ft from the SSW or S, with moderate energy and not a lot of grunt. The water is sitting at 84°, which is a touch warmer than normal for this time of year, so at least it’s comfortable.
The real action starts to fire up around Thursday, August 20th. That afternoon, the swell bumps up to 4ft from the SSE, with a clean cross-offshore wind from the SW. Energy climbs to 235 units, and it’s actually looking like a proper session.
The standout is Friday, August 21st. The morning brings 5ft from the S with that same cross-offshore breeze, energy jumping to 367 units. It’s clean, it’s got some power, and it’s in the sweet spot for most of us. By the afternoon, the swell pushes to 7ft from the SSW, with energy roaring up to 922 units – that’s serious power. But with that size, it’s getting a bit heavy for beginners, and the period is only 8 seconds, so it’s a short-period windswell that’ll be a bit lumpy. For the experienced guys, it’s a big day.
Then Saturday, August 22nd, is a beauty. Both morning and afternoon are glassy, with winds from the E, and the swell sits around 4ft to 4ft from the S, energy around 200 to 251 units. Clean, fun waves all day.
After that, it drops right off into tiny, weak stuff. The best of the whole run is Friday, August 21st, with the morning being the cleanest and most powerful. If you want glassy, go for Saturday the 22nd.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Thu morning. Warm (max 29°C on Sat morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Sun night. Warm (max 29°C on Sat afternoon, min 25°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 10 | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | S 9 | E 10 | E 10 | E 10 | ESE 9 | ESE 10 | E 10 | ESE 9 | SE 10 | SE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 88 | 83 | 88 | 86 | 79 | 73 | 73 | 54 | 94 | 81 | 78 | 70 | 68 | 52 | 100 | 107 | 35 | 48 | 28 | 27 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-on | on | glassy | glassy | cross-on | glassy | glassy | on | cross-on | on | cross-on | on | cross-on | cross-on | glassy | on | cross-on | glassy |
High Tide | 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 | 8:59AM1.82m | 8:58PM1.86m | |||||||
Low Tide | 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 | 2:54PM0.76m | ||||||||
 |  |  | | |  | | | |  |  | | | | |  |  | | |  | |
 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — |
 | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | 4 | 5 | 3 | 2 | — | 1 | 1 | — | 1 | 6 | 1 | 2 | 9 | 3 | — | — | — | — | — |
Temp °C | 28 | 25 | 26 | 26 | 24 | 28 | 28 | 25 | 29 | 29 | 26 | 28 | 27 | 25 | 27 | 28 | 26 | 29 | 29 | 26 |
Feels °C | 30 | 29 | 29 | 30 | 28 | 31 | 31 | 29 | 32 | 32 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | ESE 5 | S 9 | S 9 | ESE 5 | ESE 9 | S 9 | ESE 5 | ESE 9 | SSW 8 | SE 5 |
| kJ | 88 | 83 | 88 | 86 | 79 | 73 | 73 | 54 | 94 | 81 | 37 | 54 | 57 | 33 | 100 | 38 | 19 | 48 | 21 | 10 |
Swell 2 Height (m) Direction Period (s) | SSW 10 | SW 10 | SE 12 | E 9 | ESE 4 | E 9 | ESE 4 | E 9 | E 10 | ESE 9 | S 9 | E 10 | E 10 | S 8 | S 8 | SE 11 | S 8 | SSW 8 | SE 10 | SE 10 |
| kJ | 58 | 26 | 23 | 7 | 16 | 15 | 3 | 28 | 30 | 28 | 78 | 70 | 68 | 52 | 35 | 42 | 35 | 22 | 28 | 27 |
Swell 3 Height (m) Direction Period (s) | E 10 | SE 12 | E 10 | SE 12 | E 10 | SE 11 | E 9 | S 11 | SE 11 | SE 8 | E 10 | SE 12 | SE 11 | E 10 | SE 11 | SE 7 | E 10 | SE 11 | E 9 | SSW 8 |
| kJ | 8 | 24 | 7 | 22 | 16 | 20 | 15 | 22 | 18 | 10 | 50 | 48 | 33 | 47 | 43 | 2 | 28 | 29 | 14 | 13 |
Wind waves Height (m) Direction Period (s) | — | ESE 3 | ESE 3 | ESE 4 | — | SE 4 | SE 4 | — | — | E 5 | — | ESE 5 | ESE 6 | — | — | ESE 10 | — | — | SE 4 | — |
| kJ | — | 2 | 2 | 10 | — | 4 | 6 | — | — | 17 | — | 46 | 53 | — | — | 107 | — | — | 8 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 33 | 0 | 30 | 0 | 0 | 30 | 4 | 0 | 0 | 33 | 14 | 30 | 30 | 0 | 33 | 4 | 0 | 0 | 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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