Surf Forecasts:
Ikumi Beach surf forecast from 14 Sep 2026:
- Best quality surf: Saturday 19 Sep, 3AM (local time) - 10ft (3.0m), 16s period, ESE swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 12PM (local time) - 15ft (4.5m), 15s period, SE swell with 8,975 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 6PM (local time) - 3.5ft (1.1m), 9s period with SE 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 Monday (Sep 14) at 6PM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.3m and 12s. 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 4.5m 15s and forecast to arrive on Sunday (Sep 20) 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 1.4m 5s period and expected on Sunday (Sep 20) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 14th Sep) | 3.5ft (1.1m) 9s |
| Best Surf | 3AM (Sat 19th Sep) | 10ft (3.0m) 16s |
| Most Powerful | 12PM (Sun 20th Sep) | 15ft (4.5m) 15s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright crew, Rusty here again, same spot but in feet and knots for ya.
Water temp is 82°F right now, which is pretty normal for the season.
Monday morning the 14th of September gives us a little 3ft SE swell with an 8-second period and glassy wind. Clean, but energy is weak. Ikumi Beach is inconsistent and often crowded, so you’ll be sharing those small waves.
Tuesday the 15th is the real standout. Morning brings a 5ft SE swell with a 9-second period and glassy conditions. Energy is solid (404). It’s not big, but it’s clean and fun. Afternoon is similar at 4ft with glassy wind.
Wednesday and Thursday are crap—small surf and cross winds. Don’t bother.
Friday the 18th sees a jump to 8ft from the E, with a 9-second period. That’s getting big for beginners. Wind is cross-on and bumpy, so it’s a bit messy but possible for experienced surfers.
Saturday the 19th the swell goes nuts—12ft to 13ft from the ESE with a very long 15-16 second period. Energy is enormous (6196 to 6312). This is huge groundswell, expert-only. The long period makes it dump hard at this beach. Honestly, this looks more like a kite-surfing day than a paddle day.
Sunday the 20th is even bigger—15ft SE swell with a 15-second period. That’s massive energy (8944). Too big for almost everyone, with moderate cross-shore wind and bumps.
After that, it drops off fast. From Monday the 21st, the surf fades and winds get rough. From the 23rd of September onward, it’s tiny and messy through to the 29th. Nothing worth the paddle.
Best bet: Tuesday the 15th of September for clean, glassy waves in the 3-4ft range. The big stuff on the 19th and 20th is for experts only, and the second week is a flat spell.
Rusty.
Short Range ForecastHeavy rain (total 31mm), heaviest during Wed morning. Warm (max 29°C on Mon morning, min 21°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Sat afternoon, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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) | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | ESE 8 | E 9 | E 9 | ESE 16 | ESE 16 | ESE 15 | SE 15 | SE 15 | SE 15 | SE 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 132 | 138 | 235 | 338 | 231 | 178 | 115 | 96 | 79 | 79 | 94 | 207 | 888 | 747 | 1809 | 6196 | 6312 | 7043 | 8905 | 8338 | 8543 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | glassy | glassy | glassy | glassy | cross | cross | cross-off | cross | cross-on | cross-on | cross-on | on | glassy | cross-on | cross | cross-off | cross | cross | cross |
High Tide | 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 | 12:08PM1.46m | 10:02PM1.61m | 2:24PM1.49m | 11:44PM1.51m | ||||||||
Low Tide | 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 | 4:41AM0.58m | 4:26PM1.31m | 6:08AM0.66m | 6:56PM1.36m | ||||||||
 |  |  | | | | | |  | |  |  | | | | | | | | |  | |
 | 5:43 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:48 | — | — | 5:48 | — | — |
 | — | 6:12 | — | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — | — | 6:02 | — |
mm | — | 2 | 6 | 4 | 5 | 3 | 8 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 24 | 26 | 27 | 24 | 25 | 24 | 23 | 27 | 27 | 23 | 26 | 26 | 24 | 26 | 28 | 24 | 26 | 27 | 25 |
Feels °C | 32 | 30 | 29 | 31 | 32 | 28 | 29 | 27 | 25 | 27 | 28 | 25 | 27 | 28 | 27 | 28 | 28 | 26 | 26 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | E 12 | ESE 9 | ESE 9 | ESE 16 | ESE 16 | ESE 15 | SE 15 | SE 15 | SE 15 | SE 15 |
| kJ | 132 | 138 | 235 | 338 | 231 | 178 | 115 | 96 | 79 | 79 | 94 | 3 | 380 | 367 | 1809 | 6196 | 6312 | 7043 | 8905 | 8338 | 8543 |
Swell 2 Height (m) Direction Period (s) | E 13 | E 12 | E 12 | E 12 | E 13 | E 13 | E 12 | S 7 | E 13 | E 12 | E 12 | S 6 | SE 16 | SE 17 | ESE 10 | — | — | — | — | — | — |
| kJ | 13 | 12 | 12 | 49 | 14 | 12 | 3 | 1 | 3 | 3 | 3 | 1 | 11 | 148 | 510 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 6 | S 7 | S 7 | E 15 | S 6 | S 7 | E 14 | S 7 | S 7 | S 7 | — | — | S 11 | S 10 | S 10 | — | — | — | — | — | — |
| kJ | 3 | 1 | 1 | 17 | 1 | 1 | 4 | 1 | 1 | 1 | — | — | 2 | 2 | 8 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNE 3 | NE 4 | NNE 4 | NE 4 | NE 4 | ESE 8 | E 9 | E 9 | E 10 | — | — | N 4 | NNE 4 | NNE 5 | NNE 5 |
| kJ | — | — | — | — | — | — | 4 | 10 | 13 | 18 | 5 | 207 | 888 | 747 | 1307 | — | — | 26 | 39 | 83 | 93 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 4 | 0 | 0 | 0 | 0 | 8 | 8 | 0 | 8 | 14 | 30 | 8 | 4 | 0 | 10 | 30 | 10 | 30 | 30 | 14 |
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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