Surf Forecasts:
Ikumi Beach surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6PM (local time) - 5.5ft (1.7m), 13s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 5.5ft (1.7m), 13s period, SE swell with 1,006 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 12AM (local time) - 2.5ft (0.7m), 8s 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 Wednesday (Aug 19) at 12AM. The primary swell is predicted to be 0.7m and 8s 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 1.7m 13s and forecast to arrive on Tuesday (Aug 25) at 6PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 9s period and expected on Tuesday (Aug 25) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 19th Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 6PM (Tue 25th Aug) | 5.5ft (1.7m) 13s |
| Most Powerful | 6PM (Tue 25th Aug) | 5.5ft (1.7m) 13s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, mates, it’s gonna be a quiet start here. For the first few days, there’s barely a ripple worth paddling for, so don’t bother getting the wax out just yet. It’s not until Friday morning the 21st of August that we finally see a pulse of energy, with the combined swell energy hitting a moderate 208 and some glassy conditions. That Friday morning is your first real chance to get wet, with a 3ft swell coming from the south, and the wind is dead glassy. It’s only fair, but at least it’s clean.
The real story, though, kicks off the following week. From Tuesday the 25th of August, the ocean just wakes up. We’ve got a solid 3ft SSE swell on the Tuesday morning with a very long 16-second period, and combined energy sitting at a strong 537. That south-east groundswell is the real deal, but the cross-onshore wind makes it a bit messy—still worth a look if you’re keen.
Then comes the standout window. Thursday morning the 27th of August is where it’s at. You’ve got 8ft of SSE swell with a very long 15-second period, glassy conditions, and the combined energy is massive at 3103. The water temp is a warm 83°F, which is pretty standard for this time of year, so it’s a beautiful session for experienced surfers. It’s a bit too big for beginners, but if you’ve got the chops, this is the morning to be out there.
That big energy keeps rolling into Friday the 28th, with 12ft of S swell and a 16-second period—again glassy in the morning. The combined energy is huge at 5647. But honestly, by Thursday afternoon and into Friday, the swell is pushing 10ft to 12ft, and that’s expert-only territory. It’s gonna be a proper electric, heavy day at Ikumi Beach. The break itself is inconsistent and the crowds can be an issue, especially when it’s this good—so get there early or find a quiet peak.
Sunday the 30th of August is another excellent morning, with 7ft of SSW groundswell, again a long 14-second period, glassy, and combined energy at 2261. It’s a bit smaller than the peak, but the quality is still high, and it’s more manageable for a strong intermediate.
All in all, the 27th and 28th of August are the standout days. Big, clean groundswell, glassy mornings and a proper long period that will wrap nicely into the break. Just remember, Ikumi Beach can get crowded when it’s good, so plan ahead.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Tue afternoon. Warm (max 30°C on Fri morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Sat morning, min 25°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 5 | SE 8 | ESE 8 | ESE 8 | SE 10 | SE 10 | SE 10 | S 9 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 36 | 69 | 56 | 51 | 29 | 25 | 25 | 99 | 101 | 190 | 173 | 141 | 149 | 116 | 90 | 88 | 86 | 70 | 94 | 21 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | on | cross-on | glassy | glassy | cross-on | cross-off | glassy | cross | cross-off | glassy | cross-on | cross-off | glassy | cross-on | glassy | glassy | on | glassy |
High Tide | 8:58PM1.86m | 9:48AM1.68m | 9:27PM1.81m | 10:51AM1.55m | 10:01PM1.74m | 12:28PM1.45m | 10:49PM1.66m | 2:49PM1.47m | 00:11AM1.59m | 4:10PM1.59m | 2:01AM1.59m | 4:51PM1.70m | ||||||||
Low Tide | 3:27AM0.55m | 3:26PM0.93m | 4:16AM0.59m | 4:02PM1.10m | 5:20AM0.63m | 4:54PM1.26m | 6:46AM0.65m | 6:52PM1.37m | 8:20AM0.60m | 9:07PM1.34m | 9:32AM0.51m | 10:12PM1.22m | ||||||||
 |  | | |  |  | | | | | | | | | | | | | | | |
 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — |
 | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:39 | — | — | 6:38 | — |
mm | 2 | 3 | 1 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 28 | 28 | 26 | 29 | 29 | 26 | 30 | 29 | 26 | 30 | 30 | 26 | 29 | 29 | 25 | 29 | 29 | 26 |
Feels °C | 31 | 31 | 32 | 33 | 32 | 32 | 33 | 31 | 33 | 32 | 30 | 33 | 33 | 30 | 32 | 31 | 29 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 8 | ESE 8 | SE 10 | ESE 7 | ESE 7 | S 8 | S 9 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SE 10 | SW 9 |
| kJ | 28 | 69 | 56 | 26 | 29 | 18 | 21 | 99 | 101 | 190 | 173 | 141 | 149 | 116 | 90 | 88 | 86 | 70 | 49 | 90 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SE 10 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 11 | S 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | SE 11 | ESE 11 | SE 10 | E 12 | SE 9 |
| kJ | 11 | 27 | 26 | 11 | 25 | 25 | 25 | 29 | 62 | 44 | 29 | 43 | 17 | 10 | 40 | 30 | 40 | 35 | 12 | 21 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | SSW 8 | SSW 8 | SW 9 | SSW 8 | S 8 | ESE 7 | ESE 7 | ESE 11 | E 6 | E 6 | ESE 6 | E 10 | ESE 13 | SSE 10 | SSE 9 | SSE 10 | ESE 12 | SE 5 | ESE 10 |
| kJ | 13 | 11 | 11 | 3 | 6 | 12 | 9 | 5 | 45 | 3 | 3 | 4 | 8 | 17 | 9 | 9 | 9 | 29 | 1 | 20 |
Wind waves Height (m) Direction Period (s) | SE 5 | — | — | ESE 8 | — | — | — | — | — | — | SW 3 | — | — | SW 3 | — | SSW 3 | SW 3 | — | SSW 9 | SW 3 |
| kJ | 36 | — | — | 51 | — | — | — | — | — | — | 2 | — | — | 1 | — | 1 | 1 | — | 94 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 0 | 30 | 4 | 0 | 0 | 16 | 0 | 0 | 4 | 0 | 0 | 16 | 0 | 0 | 16 | 0 | 0 | 33 | 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.
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