Surf Forecasts:
Ikumi Beach surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 6AM (local time) - 2.5ft (0.7m), 8s period, ESE swell with glassy winds.
- Most powerful swell: Wednesday 26 Aug, 3AM (local time) - 5.5ft (1.7m), 14s period, SSE swell with 1,019 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 6AM (local time) - 2.5ft (0.7m), 8s period with ESE 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 6AM. 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 14s and forecast to arrive on Wednesday (Aug 26) 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 3s period and expected on Sunday (Aug 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 19th Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 6AM (Wed 19th Aug) | 2.5ft (0.7m) 8s |
| Most Powerful | 3AM (Wed 26th Aug) | 5.5ft (1.7m) 14s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, mate, Rusty here. Let’s have a good look at what’s on offer for Ikumi Beach.
To be honest, the next week and a bit is pretty flat and unremarkable. There's small, weak swell on the cards, and we’re really just waiting for things to kick off. From Wednesday the 19th through to about Thursday the 28th, it’s mostly small, weak surf with a combined energy that barely gets out of the double digits (93). The best of that early period is the Friday and Saturday mornings, the 21st and 22nd, where we see a little bump to 3ft from the south with glassy conditions – surfable, but nothing to write home about.
The real story, and the one true standout in this whole 16-day window, is the final day of August. Monday the 31st is the one to circle. The morning has a solid 7ft south-southwest swell with clean, offshore wind from the west-northwest, and conditions just get better into the afternoon. By the afternoon, you’ve got a 8ft south-southwest groundswell with a 14-second period and glassy conditions. The combined energy is pumping at 3777 (moderate-to-strong), meaning there’s real power in the water. This is for experienced surfers only, as 8ft is well into the expert zone, but the wave quality should be excellent at a beach break like this, especially with that long period and clean surface. The water temperature is about average for this time of year, so no surprises there. Crowds are often a factor at Ikumi, so expect company, but for those in the know, that Monday arvo is the session to chase.
After that, the first couple of days of September see the swell absolutely roar to life, but it gets too big – 10ft, then 15ft, then 16ft – with combined energy readings hitting four and five digits (7037, 9316, 13599). That’s massive, powerful and very strong energy, but it’s way over the head for this spot. It’s going to be a close-out mess or unsurfable at Ikumi Beach. Unless you’re towing in or after a death wish, that’s a hard pass.
So, to sum it up: keep your board handy for the tiny glassy mornings around the 21st and 22nd for a fun splash, but the absolute pick of the period is Monday the 31st of August, with that solid, clean south-southwest groundswell. Get on it if you’ve got the skills.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Tue night. Warm (max 29°C on Thu 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. | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 | ESE 8 | ESE 8 | SE 10 | SE 10 | SE 10 | S 9 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 10 | SSW 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 69 | 56 | 51 | 29 | 25 | 34 | 102 | 127 | 133 | 138 | 138 | 110 | 119 | 148 | 105 | 90 | 71 | 86 | 60 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-on | glassy | glassy | cross-on | glassy | glassy | cross | glassy | glassy | cross-on | glassy | glassy | cross-on | glassy | on | cross-on | glassy |
High Tide | 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 | 3 | 1 | 3 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 28 | 28 | 26 | 29 | 29 | 26 | 29 | 29 | 26 | 30 | 30 | 26 | 30 | 29 | 26 | 29 | 28 | 25 |
Feels °C | 31 | 32 | 33 | 32 | 32 | 33 | 31 | 32 | 33 | 30 | 33 | 33 | 30 | 33 | 32 | 31 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 8 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | S 8 | S 9 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 10 | SSW 10 |
| kJ | 69 | 56 | 51 | 29 | 18 | 34 | 102 | 127 | 133 | 138 | 138 | 110 | 119 | 148 | 105 | 90 | 71 | 86 | 60 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | ESE 11 | ESE 11 | SE 10 | SE 10 | ESE 10 |
| kJ | 27 | 26 | 26 | 25 | 25 | 25 | 28 | 44 | 44 | 29 | 43 | 17 | 10 | 40 | 46 | 40 | 35 | 33 | 42 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | S 8 | SE 7 | ESE 7 | ESE 7 | ESE 6 | E 6 | E 6 | E 10 | ESE 13 | SSE 10 | SSE 10 | SSE 10 | ESE 12 | ESE 12 | SSE 9 |
| kJ | 11 | 11 | 11 | 6 | 12 | 11 | 9 | 4 | 4 | 3 | 3 | 8 | 16 | 9 | 9 | 9 | 29 | 28 | 8 |
Wind waves Height (m) Direction Period (s) | SE 4 | — | — | — | — | — | — | — | — | SW 2 | — | — | SW 2 | — | SSW 2 | SW 3 | — | SSW 2 | SW 2 |
| kJ | 15 | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — | 1 | 2 | — | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 0 | 16 | 0 | 0 | 16 | 0 | 33 | 4 | 0 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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